CN117347323A - In-situ non-contact water turbidity on-line detection system and method - Google Patents
In-situ non-contact water turbidity on-line detection system and method Download PDFInfo
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- CN117347323A CN117347323A CN202311390927.6A CN202311390927A CN117347323A CN 117347323 A CN117347323 A CN 117347323A CN 202311390927 A CN202311390927 A CN 202311390927A CN 117347323 A CN117347323 A CN 117347323A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 165
- 238000001514 detection method Methods 0.000 title claims abstract description 121
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title abstract description 19
- 238000012937 correction Methods 0.000 claims abstract description 13
- 239000010802 sludge Substances 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 20
- 238000005259 measurement Methods 0.000 abstract description 12
- 238000012625 in-situ measurement Methods 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 6
- 238000005086 pumping Methods 0.000 abstract description 6
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- 238000012545 processing Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000012372 quality testing Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
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Abstract
The invention discloses an in-situ non-contact water turbidity online detection system and method. Comprising the following steps: the controller and the water quality detection module; the water quality detection module is positioned above the detected target, the modulated light source forms a certain included angle with the detector, the reference detector and the target detector respectively convert scattered light signals of the modulated light source and the detected target into photocurrent signals, and the photocurrent signals are processed to form reference signals and target signals and then are sent to the controller; the controller calculates a turbidity value based on the reference signal and the target signal. The target detector is a double-image limit detector and outputs two optical signals. The intensity of the optical signal is inversely proportional to the square of the distance in linear relation to the turbidity of the water. The change in the ratio of the two optical signals reflects the change in distance. And the measurement of different distances of turbidity is realized through distance correction. The method can be used for in-situ measurement without pumping water, solves the problems that the existing detector is easy to be polluted or the pipeline is easy to be blocked, and reduces the equipment maintenance frequency and the maintenance cost.
Description
Technical Field
The invention relates to the technical field of environmental monitoring, in particular to an in-situ non-contact water turbidity online detection system and method.
Background
Turbidity is an important indicator of water quality. In the fields of water quality monitoring and environment monitoring such as river and lake, drinking water production, sewage treatment, municipal drainage and the like, on-line detection of the turbidity of water quality is required. The detection of the turbidity of water quality is based on the scattering principle of light, and when a beam of light irradiates to a water body, scattered light can be generated when the light encounters particles in the water body. Current on-line water quality detection instruments either have the detector receive scattered light underwater or pump water up to the detector receive scattered light from above the water surface. When the detector is underwater, the optical window of the receiver is contaminated by the water body and requires regular cleaning and maintenance. The water is pumped up, and the pumped pipeline is often blocked. Such as river channels, sewage wells, catch basins, sewage treatment tanks, etc., the cleaning of the detector under water is very difficult. The water is pumped up for measurement, the water pipe is blocked by various sundries, and the cleaning of the pipelines is difficult.
The measuring instrument for the turbidity of the water quality in the scene is often interfered by sundries and blockage, the data is not real, and the maintenance workload of the instrument is large. The invention needs to invent a new water turbidity measuring method, which overcomes the problems that the existing detector is easy to be polluted and the pipeline is difficult to clean, ensures the long-term stability and reliability of turbidity detection data, and reduces the daily maintenance workload of instruments.
Disclosure of Invention
The invention provides an in-situ non-contact water turbidity on-line detection system and method, which are used for determining a water quality detection result by determining a sludge concentration value.
According to one aspect of the present invention, there is provided an in-situ non-contact water turbidity online detection system, comprising: the controller is connected with the water quality detection module;
the water quality detection module is used for generating a modulated light source according to the acquired light source driving signal, determining a reference signal and a target photocurrent signal according to the modulated light source, and sending the reference signal and the target photocurrent signal to the controller, wherein the water quality detection module comprises: a light source emitter, a reference detector, and a dual-quadrant detector;
and the controller is used for calculating a sludge concentration value according to the reference signal and the target photocurrent signal.
Optionally, the system further comprises: a user terminal connected to the controller; the user terminal is used for receiving the water quality detection instruction of the user and sending the water quality detection instruction to the controller; and the controller is used for generating a light source driving signal according to the water quality detection instruction and sending the light source driving signal to the water quality detection module.
Optionally, the light source emitter is configured to obtain a light source driving signal, obtain a modulation parameter set by a user based on the light source driving signal, generate a modulated light source according to the modulation parameter, and send the modulated light source to the reference detector and the measured target; the reference detector is used for determining a light source attenuation parameter according to the modulated light source; and the double-quadrant detector is used for receiving scattered light of the measured target on the modulated light source and respectively generating photocurrent signals according to the receiving condition of the scattered light.
Optionally, the controller is specifically configured to: the reference signal is subjected to analog-to-digital conversion to generate a first signal and a correction coefficient, the photocurrent signal is subjected to analog-to-digital conversion to generate a second signal and a third signal, the second signal and the third signal are corrected and determined based on the first signal, the second signal and the third signal are substituted into a first designated algorithm to determine the liquid level distance between the detector and the measured object, and the second signal, the third signal and the liquid level distance are substituted into a second designated algorithm to determine the sludge concentration value.
Optionally, the system further comprises: the alarm module is connected with the controller; the controller is used for judging whether the sludge concentration value is smaller than a preset threshold value, if so, determining that the water quality detection result is normal, otherwise, determining that the water quality detection result is abnormal, and sending the water quality detection result to the alarm module; and the alarm module is used for generating prompt information according to the water quality detection result and alarming in a specified mode according to the prompt information.
Optionally, the controller is further configured to send a water quality detection result and a sludge concentration value to the user terminal; and the user terminal is used for receiving the sludge concentration value and displaying the sludge concentration value.
According to another aspect of the present invention, there is provided an in-situ non-contact water turbidity on-line detection method, comprising:
generating a modulated light source according to the acquired light source driving signal by a water quality detection module, determining a reference signal and a target photocurrent signal according to the modulated light source, and sending the reference signal and the target photocurrent signal to a controller, wherein the water quality detection module comprises: a light source emitter, a reference detector, and a dual-quadrant detector;
and calculating a sludge concentration value according to the reference signal and the target photocurrent signal by the controller.
According to the technical scheme, the water quality detection module is used for generating the modulated light source, determining the light source attenuation condition of the modulated light source and further determining the reference signal, determining the photocurrent signal of the double-quadrant detector according to the scattered light of the modulated light source, and calculating the sludge concentration value according to the reference signal and the target photocurrent signal by the controller to determine the water quality detection result, so that the manual workload is reduced, the water quality measurement efficiency is improved, the probe does not need to be cleaned regularly and further the maintenance cost is reduced, and the measurement of different turbidity distances is realized through distance correction. The method can be used for in-situ measurement without pumping water, solves the problems that the existing detector is easy to be polluted or the pipeline is easy to be blocked, and reduces the equipment maintenance frequency and the maintenance cost.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an in-situ non-contact system for detecting turbidity of water quality on line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an in-situ non-contact water turbidity online detection scenario according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram showing the signal processing relationship of an in-situ non-contact water turbidity online detection system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another in-situ non-contact system for detecting turbidity of water quality on line according to a second embodiment of the present invention;
FIG. 5 is a flow chart of an in-situ non-contact water turbidity online detection method according to a third embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
FIG. 1 is a schematic diagram of an in-situ non-contact system for detecting turbidity of water quality on line, according to an embodiment of the present invention, the system comprises: the controller 110, the water quality testing module 120 that links to each other with the controller 110. The water quality detection module 120 specifically includes: a light source emitter 121, a reference detector 122 and a dual-quadrant detector 123. The system further comprises: a user terminal 130 connected to the controller 110.
The water quality is the condition for evaluating the quality of the water body, a series of water quality parameters and water quality standards are specified, and the quality of the water quality is measured, so that a user is required to perform relevant detection on the water quality such as sludge concentration and the like. The sludge is granular matters generated in the water and sewage treatment process, and the detection result of the granular matters of the water quality can be determined according to the sludge concentration value in the water quality to be detected. The controller 110 is a computer controller 110 for detecting and determining water quality, the controller 110 is connected with the water quality detection module 120, and the water quality detection module 120 is a module for detecting the water quality to be detected according to the instruction of the controller 110.
Optionally, the water quality detection module 120 is configured to generate a modulated light source according to the obtained light source driving signal, determine a reference signal and a target photocurrent signal according to the modulated light source, and send the reference signal and the target photocurrent signal to the controller 110; and a controller 110 for calculating a sludge concentration value based on the reference signal and the target photocurrent signal.
Specifically, the water quality detection module 120 may be an in-situ non-contact sludge concentration detection device, and the light source driving signal is a signal for controlling the water quality detection module 120 to generate a modulated light source and turn on the detection. The water quality detection module 120 may generate a modulated light source according to the acquired light source driving signal. It should be noted that, the generation of the modulated light source requires processing of the normal light source, i.e. transferring the information carried by the electrical signal to the light source used for transmission, i.e. modulation of the light. Since light has four parameters of frequency, intensity, phase and polarization, modulation of light can be classified into frequency modulation, intensity modulation, phase modulation and polarization modulation. The user may set the modulated light source according to the detection requirement, and the water quality detection module 120 may determine the reference signal and the target photocurrent signal according to the modulated light source. The reference signal is a reference standard determined by the water quality detection module 120 according to the attenuation condition of the light source, that is, different measurement environments correspond to different reference signals, so that the water quality detection result is more accurate. The water quality detection module 120 sends the reference signal and the target photocurrent signal to the controller 110 for sludge concentration techniques. The controller 110 can bring the calculation data into and calculate the sludge concentration value through a specific algorithm according to the light source scattering principle, wherein the signal of scattered light is in direct proportion to the concentration of the granularity of the measured object.
Optionally, the system further comprises: a user terminal 130 connected to the controller 110; the user terminal 130 is configured to receive a water quality detection instruction of a user, and send the water quality detection instruction to the controller 110; the controller 110 is configured to generate a light source driving signal according to the water quality detection instruction, and send the light source driving signal to the water quality detection module 120.
The user terminal 130 is an external device connected to the controller 110, and the user terminal 130 may be an upper computer. The water quality detection module 120 includes a light source emitter 121, a reference detector 122 and a double-image limit detector 123, wherein the light source emitter 121 refers to a device for transmitting light source, and the light source emitter 121 can convert the modulated electric signal sent by the controller 110 into an optical signal, and transmit the optical signal to the measured liquid level through a lens. The reference detector 122 is used to identify the light source attenuation, and then determine the reference signal according to the light source attenuation, and the reference detector 122 may be a photocell. The double-limit detector 123 is a binary photoelectric detector, and light spots of the modulated light source are scattered by particles in the liquid level of the target to be detected after being shot into the liquid level of the target to be detected, so that scattered light spots are formed and received by the double-limit detector 123, and two different photocurrent signals are generated.
Specifically, the user may input a water quality detection instruction through the user terminal 130, the user refers to a worker or a technician performing water quality detection, the water quality detection instruction may be input by clicking a water quality detection button on the upper computer, at this time, the user terminal 130 may send the water quality detection instruction to the controller 110, the controller 110 may light a driving signal according to the water quality detection instruction, and send the light source driving signal to the water quality detection module 120, so that the water quality detection module 120 starts water quality detection according to the light source driving signal.
Optionally, the controller 110 is further configured to send the water quality detection result and the sludge concentration value to the user terminal 130; and the user terminal 130 is used for receiving and displaying the water quality detection result and the sludge concentration value.
Specifically, the controller 110 also sends the water quality detection result and the sludge concentration value to the user terminal 130 for display, so that the user can grasp the water quality detection result and the sludge concentration in time.
Optionally, the light source emitter is configured to obtain a light source driving signal, obtain a modulation parameter set by a user based on the light source driving signal, generate a modulated light source according to the modulation parameter, and send the modulated light source to the reference detector and the measured target; the reference detector is used for determining a light source attenuation parameter according to the modulated light source; and the double-quadrant detector is used for receiving scattered light of the measured target on the modulated light source and respectively generating photocurrent signals according to the receiving condition of the scattered light.
Specifically, after the light source emitter 121 obtains the light source driving signal, the modulation parameter set by the user is obtained based on the light source driving signal, and the modulation parameter may be, for example, an LED light source or a laser light source with a wavelength of 650nm, where the light source emitter 121 generates and emits a 650nm modulated light source, and at the same time, the user may select other light sources with specific wavelengths to emit. The use of modulated light sources for emission can reduce external ambient light interference and improve equipment stability. The light source transmitter 121 sends the modulated light source to the reference detector 122 and scatters the modulated light source to the dual-image-limit detector 123 via the measured object, specifically, the light source is split into two beams by the spectroscope, one of the two beams is reflected to the reference detector 122, and the reference detector 122 determines the light source attenuation condition, that is, the reference signal corresponding to the light source attenuation parameter according to the modulated light source. The dual-quadrant detector 123 can determine the receiving condition of the scattered light of the target after the modulated light source is scattered by the measured target, and then respectively generate two photocurrent signals according to the receiving condition of the light source. The other path of light beam passes through the spectroscope to form light spots on the water to be measured, the light spots emitted by the modulated light source to the liquid level are emitted into the liquid level to be measured and scattered to form scattering light spots, and the scattering light spots are received by the double-image-limit detector 123 to generate two different photocurrent signals.
Optionally, the controller is specifically configured to: the reference signal is subjected to analog-to-digital conversion to generate a first signal and a correction coefficient, the photocurrent signal is subjected to analog-to-digital conversion to generate a second signal and a third signal, the second signal and the third signal are corrected and determined based on the first signal, the second signal and the third signal are substituted into a first designated algorithm to determine the liquid level distance between the detector and the measured object, and the second signal, the third signal and the liquid level distance are substituted into a second designated algorithm to determine the sludge concentration value.
Specifically, the controller 110 includes an analog-to-digital conversion unit, which can perform analog-to-digital conversion on the reference signal and the target photocurrent signal to generate a first signal and a correction coefficient, then perform analog-to-digital conversion on the photocurrent signal to generate a second signal and a third signal, correct the second signal and the third signal according to the first signal and the correction coefficient, substitute the corrected second signal and third signal into a first specified algorithm to determine a device liquid level distance, that is, a liquid level distance between the detector and the measured object, and then further according to a light source scattering principle, the scattered light signal is proportional to the concentration of the measured object granularity, and substitutes the second signal, the third signal and the device liquid level distance into a second specified algorithm to determine a sludge concentration value.
In a specific embodiment, fig. 2 is a schematic diagram of an in-situ non-contact on-line detection scenario of turbidity of water according to an embodiment of the present invention. Fig. 2 includes a light source (emitted by a light source emitter 121), a photocell (reference detector 122), a lens 1, a beam splitter, a lens 2, and a dual-limit detector 123. The light source emits 650nmLED modulated light source, the light source is divided into two beams through a spectroscope by a lens 1 capable of adjusting the size of a light spot, and one beam is reflected to a reference photocell for distinguishing the attenuation condition of the light source; the other path of the light passes through the spectroscope to form light spots on the liquid surface. The light spot of the light beam which is emitted to the liquid level is emitted to the solution to be measured for back scattering, the scattered light is focused by the lens 2 which is arranged at a certain angle with the light source, and a small light spot is formed and received by the double-image limit detector 123. The scattering signal received by the double-limit detector is proportional to the concentration of the particles in the water and inversely proportional to the square of the liquid level distance. When the liquid level changes, the imaging positions of the light spots on the two detectors change, and the distance information can be detected through the change, so that the detection of the distance is realized. The sludge concentration value in the water sample can be obtained through circuit processing and numerical calculation of signals received by the two quadrant detectors. The light source and the double-image limit detector are both positioned above the water body, and the positions are unchanged. A light source enters the water surface from the upper part of the water body, and a double-image limit detector forming a certain included angle with the light source receives scattered light of particles in the water body. The intensity of scattered light is linearly related to the turbidity of water. When the water body height is unchanged, the proportion of the scattered light intensity received by the double-image limit detector is unchanged, and the change of the intensity reflects the change of turbidity. When the water body height changes and the turbidity is unchanged, the energy distribution and the signal intensity on the double-image limit detector change, the change of the energy proportion of the double-image limit detector reflects the water surface height change, and the water surface distance can be determined through the change. Since the intensity of scattered light received by the detector is inversely proportional to the square of the distance. And the measurement of different distances of turbidity is realized through distance correction. The defect that the non-contact equipment needs to be fixed in test distance is overcome. The non-contact water turbidity measuring method with the distance correcting function can be used for in-situ measurement without pumping water, solves the problems that the existing detector is easy to be polluted or a pipeline is easy to be blocked, and reduces equipment maintenance frequency and maintenance cost.
The lens 1 is configured to adjust the distance to control the spot size. The beam splitter preferably has an incidence angle: 0 °/45 °; the reference detector 122 is located close to the light source and the reflected light need not be too strong, so that most of the light energy is transmitted out to form a strong scattering signal on the surface of the measured liquid. The lens 2 focuses the scattered light at different heights within the light sensing range of the dual-image-limit detector 123. According to the technical scheme provided by the embodiment of the invention, the turbidity of the water body is measured by the particulate matter scattering principle, and the water body is not contacted. The cleaning and long-term effectiveness of the detector are ensured, and the detector is not required to be cleaned and maintained frequently. The problem of water quality monitoring equipment daily maintenance cost high, equipment failure rate is high is solved. And the function of resisting environmental interference is designed, and the final electric signal only reflects scattered light generated by the test light source through particles through special modulation of the light source and adaptive filter processing, so that the test is more accurate. Moreover, the weather detection can be realized, and the problem that the weather data of different environments are unstable due to online equipment is solved.
Further, fig. 3 is a schematic diagram of signal processing relationship of an in-situ non-contact online water turbidity detection system according to an embodiment of the present invention. Three main parts are included in fig. 3: the water quality detection module 120, the controller 110 and the user terminal 130, the ADC refers to an analog-digital conversion unit, and the MCU refers to the microcontroller 110. The water quality detection module 120 sends a sludge light source (modulated light source) to the reference detector 122 and the double-image-limit detector 123, specifically, sends the modulated light source to the reference detector through the light source emitter and scatters the modulated light source to the double-image-limit detector through the measured liquid level, the reference detector 122 converts a reference light signal into an electric signal to a sludge reference detection circuit of the controller 110, the double-image-limit detector 123 converts the scattered light signal into the electric signal to a sludge signal monitoring circuit, and sends the electric signal to the microcontroller 110 for calculation after analog-digital conversion processing by the ADC, and finally, the calculation result can be transmitted to the user terminal 130 through the communication module to realize water quality detection.
According to the technical scheme, the water quality detection module is used for generating the modulated light source, determining the light source attenuation condition of the modulated light source and further determining the reference signal, determining the target photocurrent signal of the double-quadrant detector according to the modulated light source, and calculating the sludge concentration value according to the reference signal and the target photocurrent signal by the controller to determine the water quality detection result, so that the manual workload is reduced, the water quality measurement efficiency is improved, the probe does not need to be cleaned regularly and further the maintenance cost is reduced, and the measurement of different turbidity distances is realized through distance correction. The method can be used for in-situ measurement without pumping water, solves the problems that the existing detector is easy to be polluted or the pipeline is easy to be blocked, and reduces the equipment maintenance frequency and the maintenance cost.
Example two
Fig. 4 is a schematic structural diagram of an in-situ non-contact online detection system for turbidity of water according to a second embodiment of the present invention, where an alarm module 140 is added on the basis of the first embodiment.
Optionally, the system further comprises: an alarm module 140 connected to the controller 110; the controller 110 is configured to determine whether the sludge concentration value is smaller than a preset threshold, if yes, determine that the water quality detection result is normal, otherwise, determine that the water quality detection result is abnormal, and send the water quality detection result to the alarm module 140; and the alarm module 140 is used for generating prompt information according to the water quality detection result and alarming in a specified mode according to the prompt information.
Specifically, the system further includes an alarm module 140 connected to the controller 110, where the alarm module 140 may prompt a user when the sludge concentration is too high. The user can set a preset threshold according to the alarm requirement, and when the controller 110 judges that the sludge concentration value is smaller than the preset threshold, the water quality detection result is determined to be normal. When the controller 110 determines that the sludge concentration value is greater than or equal to the preset threshold, it determines that the water quality detection result is abnormal, and sends the water quality detection result to the alarm module 140, the alarm module 140 generates prompt information according to the water quality detection result, and alarms in a specified mode according to the prompt information, so as to prompt the user, and facilitate the user to timely grasp the abnormal condition of the water quality detection result. The specified manner includes voice or image, and the voice may be broadcast through a speaker connected to the controller 110, for example, the voice content may be: the water quality detection result is abnormal. The image may be presented by a user terminal 130 connected to the controller 110 to prompt the user.
According to the technical scheme, the water quality detection module is used for generating the modulated light source, determining the light source attenuation condition of the modulated light source and further determining the reference signal, determining the target photocurrent signal of the double-quadrant detector according to the modulated light source, and calculating the sludge concentration value according to the reference signal and the target photocurrent signal by the controller to determine the water quality detection result, so that the manual workload is reduced, the water quality measurement efficiency is improved, the probe does not need to be cleaned regularly and further the maintenance cost is reduced, and the measurement of different turbidity distances is realized through distance correction. The method can be used for in-situ measurement without pumping water, solves the problems that the existing detector is easy to be polluted or the pipeline is easy to be blocked, and reduces the equipment maintenance frequency and the maintenance cost.
Example III
FIG. 5 is a flow chart of an in-situ non-contact water turbidity online detection method according to a third embodiment of the invention. As shown in fig. 5, the method includes:
s310, generating a modulated light source according to the acquired light source driving signal by a water quality detection module, determining a reference signal and a target photocurrent signal according to the modulated light source, and sending the reference signal and the target photocurrent signal to a controller, wherein the water quality detection module comprises: a light source emitter, a reference detector, and a dual-quadrant detector.
Specifically, the water quality detection module can be an in-situ non-contact sludge concentration detection device, and the light source driving signal is a signal for controlling the water quality detection module to generate a modulated light source and start detection. The water quality detection module can generate a modulated light source according to the acquired light source driving signal. The user can set up the modulation light source according to the detection needs, and water quality testing module can confirm reference signal and target photocurrent signal according to the modulation light source. The reference signal is a reference standard determined by the water quality detection module according to the attenuation condition of the light source, so that the water quality detection result is more accurate. The water quality detection module can send the reference signal and the target photocurrent signal to the controller for detecting the sludge concentration. The controller can bring the calculated data into and calculate the sludge concentration value through a specific algorithm according to the light source scattering principle, wherein the signal of scattered light is in direct proportion to the concentration of the granularity of the measured object.
S320, calculating a sludge concentration value according to the reference signal and the target photocurrent signal through the controller.
Optionally, the controller is specifically configured to: the reference signal is subjected to analog-to-digital conversion to generate a first signal, the target photocurrent signal is subjected to analog-to-digital conversion to generate a second signal and a third signal, the second signal and the third signal are corrected and determined based on the first signal, the second signal and the third signal are substituted into a first specified algorithm to determine the device liquid level distance, and the second signal and the third signal and the device liquid level distance are substituted into a second specified algorithm to determine the sludge concentration value.
Specifically, the controller includes an analog-to-digital conversion unit, which can perform analog-to-digital conversion on a reference signal to generate a first signal and a correction coefficient, perform analog-to-digital conversion on a target photocurrent signal to generate a second signal and a third signal, correct the second signal and the third signal according to the first signal and the correction coefficient, substitute the corrected second signal and third signal into a first specified algorithm to determine a device liquid level distance, that is, a liquid level distance between the detector and a measured target, and then further according to a light source scattering principle, the scattered light signal is proportional to the concentration of the granularity of the measured object, and substitutes the second signal, the third signal and the device liquid level distance into a second specified algorithm to determine a sludge concentration value.
According to the technical scheme, the water quality detection module is used for generating the modulated light source, determining the light source attenuation condition of the modulated light source and further determining the reference signal, determining the target photocurrent signal of the double-quadrant detector after the modulated light source is scattered by the measured liquid level, and calculating the sludge concentration value according to the reference signal and the target photocurrent signal by the controller to determine the water quality detection result, so that the manual workload is reduced, the water quality measurement efficiency is improved, the probe does not need to be cleaned regularly and further the maintenance cost is reduced, and the measurement of different turbidity distances is realized through distance correction. The method can be used for in-situ measurement without pumping water, solves the problems that the existing detector is easy to be polluted or the pipeline is easy to be blocked, and reduces the equipment maintenance frequency and the maintenance cost.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. An in-situ non-contact water turbidity on-line detection system, comprising: the water quality detection module is connected with the controller;
the water quality detection module is configured to generate a modulated light source according to an acquired light source driving signal, determine a reference signal and a target photocurrent signal according to the modulated light source, and send the reference signal and the target photocurrent signal to the controller, where the water quality detection module includes: a light source emitter, a reference detector, and a dual-quadrant detector;
the controller is used for calculating a sludge concentration value according to the reference signal and the target photocurrent signal.
2. The system of claim 1, wherein the system further comprises: a user terminal connected to the controller;
the user terminal is used for receiving a water quality detection instruction of a user and sending the water quality detection instruction to the controller;
the controller is used for generating a light source driving signal according to the water quality detection instruction and sending the light source driving signal to the water quality detection module.
3. The system of claim 2, wherein the light source transmitter is configured to acquire a light source driving signal, acquire a modulation parameter set by a user based on the light source driving signal, generate a modulated light source according to the modulation parameter, and send the modulated light source to the reference detector and the target to be measured;
the reference detector is used for determining a light source attenuation parameter according to the modulated light source;
the double-image limit detector is used for receiving scattered light of the detected target on the modulated light source and respectively generating the photocurrent signals according to the receiving condition of the scattered light.
4. The system of claim 1, wherein the controller is specifically configured to: performing analog-to-digital conversion on the reference signal to generate a first signal and a correction coefficient, performing analog-to-digital conversion on the photocurrent signal to generate a second signal and a third signal, correcting and determining the second signal and the third signal based on the first signal, substituting the second signal and the third signal into a first specified algorithm to determine the liquid level distance between the detector and the measured object, and substituting the second signal, the third signal and the liquid level distance into a second specified algorithm to determine the sludge concentration value.
5. The system of claim 1, wherein the system further comprises: the alarm module is connected with the controller;
the controller is used for judging whether the sludge concentration value is smaller than a preset threshold value, if yes, determining that the water quality detection result is normal, otherwise, determining that the water quality detection result is abnormal, and sending the water quality detection result to the alarm module;
and the alarm module is used for generating prompt information according to the water quality detection result and alarming in a specified mode according to the prompt information.
6. The system of claim 2, wherein the controller is further configured to send the water quality detection result and the sludge concentration value to the user terminal;
and the user terminal is used for receiving the sludge concentration value and displaying the sludge concentration value.
7. An in-situ non-contact water turbidity online detection method, which is characterized by being applied to an in-situ non-contact water turbidity online detection system as claimed in any one of claims 1-6, comprising:
generating a modulated light source according to the acquired light source driving signal by a water quality detection module, determining a reference signal and a target photocurrent signal according to the modulated light source, and sending the reference signal and the photocurrent signal to a controller, wherein the water quality detection module comprises: a light source emitter, a reference detector, and a dual-quadrant detector;
and calculating a sludge concentration value according to the reference signal and the target photocurrent signal by the controller.
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| EP4621388A1 (en) * | 2024-03-18 | 2025-09-24 | Yokogawa Electric Corporation | Surface scatter turbidimeter and turbidity measurement method |
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