CN110320331A - A kind of Atmosphere Environment Monitoring System Bases - Google Patents

Abstract

The present invention provides a kind of Atmosphere Environment Monitoring System Bases, including multiple atmosphere environment supervision devices, server and management platform, the atmosphere environment supervision device includes cabinet and setting in the intracorporal sample gas pretreatment unit of the case, master controller, detection gas chamber and wireless communication module, sensor module is provided in the detection gas chamber, the sample gas pretreatment unit is connect with the master controller, is treated test sample gas according to the detection instruction of the master controller and is carried out constant temperature, constant pressure and constant current pretreatment；The sensor module is used to carry out minimum gas Concentration Testing to test sample gas to pretreated, and trace gas detection result is returned to the master controller；Trace gas detection result is uploaded to the server by the wireless communication module by the master controller；The management platform is connect with the server, trace gas detection result described in real time inspection.

Description

An atmospheric environment monitoring system

technical field

The invention relates to the field of atmospheric environment monitoring, in particular to an atmospheric environment monitoring system.

Background technique

With the increasing awareness of environmental protection, the air quality requirements of the environment are getting higher and higher. In the context of national environmental protection, although the concentration of trace gases in the atmosphere is very low, with the continuous air pollution in recent years, the atmosphere The content of medium and trace gases is seriously exceeding the standard, and the threat to human health is becoming more and more serious. For this reason, it is very important to realize distributed real-time monitoring of the atmospheric environment. Due to the very low content of trace gases in the atmosphere, it is very difficult to detect the content of trace gases in a complex atmospheric environment. Temperature, humidity, pressure, sampling gas flow rate and sensor calibration will affect the detection effect, which can accurately detect the atmosphere. For the trace gas in the sampled gas, anti-interference treatment should be carried out in advance. Designing reasonable pre-processing detection gas paths and gas chambers for complex detection environment and realizing accurate calibration of sensors are effective means to eliminate detection interference.

In order to solve the above problems, people have been looking for an ideal technical solution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an atmospheric environment monitoring system for the deficiencies of the prior art.

In order to achieve the above purpose, the technical solution adopted in the present invention is: an atmospheric environment monitoring system, comprising a plurality of atmospheric environment monitoring devices, a server and a management platform, wherein the atmospheric environment monitoring device includes a box body and is arranged in the box body The sample gas pretreatment device, the main controller, the detection gas chamber and the wireless communication module are equipped with a sensor module, and the detection gas chamber is provided with a sensor module.

The sample gas preprocessing device is connected with the main controller, and performs constant temperature, constant pressure and constant current pretreatment on the sample gas to be measured according to the detection instruction of the main controller;

The sensor module is used to perform trace gas concentration detection on the pretreated sample gas to be tested, and return the trace gas detection result to the main controller;

The main controller uploads the trace gas detection result to the server through the wireless communication module;

The management platform is connected with the server to view the trace gas detection results in real time.

Based on the above, the sample gas pretreatment device includes a casing, a heating end cover disposed at one end of the casing, an air inlet disposed at the other end of the casing, and a gas conduit disposed in the casing, so The heating end cover is provided with an air outlet, and the air inlet, the gas conduit and the air outlet are sequentially connected to form a gas path for the sample gas to be tested;

The air inlet is provided with a temperature and humidity sensor, the inner wall of the gas conduit is provided with a heating device, and the main controller is respectively connected with the temperature and humidity sensor and the heating device, and controls according to the detection result of the temperature and humidity sensor the heating device works;

The air outlet is provided with a pressure sensor, a flow sensor and a flow controller, and the main controller is respectively connected with the pressure sensor, the flow sensor and the flow controller, according to the pressure sensor and the flow sensor The detection result controls the flow controller to work.

Based on the above, the sensor module includes a gas sensor, a signal amplification and processing circuit, and a single-chip microcomputer with a built-in A/D conversion unit,

The single-chip microcomputer receives the detection instruction, and controls the sensor to detect the sample gas to be tested according to the detection instruction;

The sensor generates an electrical signal and sends it to the signal amplification and processing circuit;

The signal amplification and processing circuit amplifies the electrical signal, and sends the amplified electrical signal to the A/D conversion unit for A/D conversion;

The single-chip microcomputer calculates the type and concentration of the trace gas in the sample gas to be measured according to the preset standard concentration signal and the digital signal obtained after conversion.

Based on the above, the steps for obtaining the preset standard concentration signal are:

Step 1, the single-chip microcomputer receives a calibration instruction, and performs zero-point calibration of the sensor according to the calibration instruction;

Step 2, determine whether the zero point calibration is successful, if successful, perform standard concentration calibration; if unsuccessful, accumulate the times of zero point calibration and perform zero point calibration again, and determine that the sensor is faulty when three consecutive zero point calibrations are unsuccessful;

Step 3, determine whether the standard concentration calibration is successful, if successful, return the calibration success information and standard concentration signal to the single-chip microcomputer; if not, accumulate the times of standard concentration calibration, and when three consecutive standard concentration calibrations are unsuccessful It is determined that the sensor is faulty.

Based on the above, the zero point calibration is specifically:

Oxygen standard gas containing no target trace gas is used as the zero point gas to be introduced into the detection chamber, and after a preset duration of ventilation, the value of the sensor is recorded every preset time interval within the next preset duration;

An average recorded value is obtained for all recorded values of each sensor in the sensors within a preset time period, and the average recorded value of each sensor is its zero point value.

Based on the above, the standard concentration calibration is specifically:

Selecting a standard target trace gas and passing it into the detection air chamber, after a preset duration of ventilation, within the next preset duration, the value of the sensor is recorded every preset time interval;

An average recorded value is obtained for all recorded values of each sensor in the sensors within a preset time period, and the average recorded value of each sensor is its preset standard concentration signal.

Based on the above, the atmospheric environment monitoring device further includes a box temperature control unit, and the box temperature control unit includes a temperature sensor arranged in the box, a heating plate arranged at the bottom of the box, and a heating plate arranged in the box. The cooling fan on the top and the main controller are respectively connected to the temperature sensor, the heating plate and the cooling fan.

Based on the above, the atmospheric environment monitoring device further includes a GPS positioning module, and the GPS positioning module is configured to acquire the location information of the distributed atmospheric environment monitoring device in real time and upload it to the server through the wireless communication module.

Based on the above, the atmospheric environment monitoring device further includes a solar power supply.

Based on the above, the main controller adopts MSP430F67471A microcontroller.

Compared with the prior art, the present invention has outstanding substantive features and significant progress. Specifically, the sample gas pretreatment device enables the sample gas to filter out interference factors before entering the airtight chamber, so that the sensor can detect trace gases more efficiently. Accurate; through special algorithms and methods to cooperate with a closed air chamber, the sensor module is accurately calibrated with zero point gas and standard target trace gas, so that the detection data processing is more accurate; through wireless communication, the data is uploaded wirelessly, and through the server A data management platform is built to realize the user's monitoring of multiple detection areas.

Description of drawings

FIG. 1 is a schematic block diagram of the atmospheric environment monitoring system of the present invention.

FIG. 2 is a schematic structural diagram of the sample gas pretreatment device of the present invention.

FIG. 3 is a schematic block diagram of the sensor module of the present invention.

FIG. 4 is a working flow chart of the sensor module of the present invention.

FIG. 5 is a flow chart of the acquisition of the preset standard concentration signal in the present invention.

In the figure, 1. Shell; 2. Air inlet; 3. Heating end cover; 4. Air outlet; 5. Wiring port; 6. Gas conduit.

Detailed ways

The technical solutions of the present invention will be further described in detail below through specific embodiments.

As shown in FIG. 1, an atmospheric environment monitoring system includes a plurality of atmospheric environment monitoring devices, a server and a management platform. The atmospheric environment monitoring device includes a box body and a sample gas preprocessing device, a main a controller, a detection air chamber and a wireless communication module, the detection air chamber is provided with a sensor module,

The sample gas pretreatment device is connected to the main controller, and preprocesses the sample gas to be measured at constant temperature, constant pressure and constant flow according to the detection instructions of the main controller, and sends the pretreated sample gas to be measured. into the detection air chamber;

The sensor module is used to perform trace gas concentration detection on the pretreated sample gas to be tested, and return the trace gas detection result to the main controller;

The main controller uploads the trace gas detection results to the server through the wireless communication module; preferably, the main controller adopts MSP430F67471A single-chip microcomputer.

The management platform is connected with the server to view the trace gas detection results in real time.

Specifically, the atmospheric environment monitoring device further includes a GPS positioning module, and the GPS positioning module is configured to acquire the location information of the distributed atmospheric environment monitoring device in real time and upload it to the server through the wireless communication module. Preferably, the wireless communication module adopts a communication mode compatible mode, such as GPRS, Rola, NB-Iot and other compatible communication modes.

The management platform and the server read the positioning information and trace gas detection results of a plurality of the atmospheric environment monitoring devices in real time through the wireless communication module, so as to realize the grid management of the detection area. Aggregate various data to provide reliable first-hand data for management work such as analyzing the operation of the atmospheric environment monitoring system and compiling real-time data statistical reports.

Specifically, specifically, as shown in FIG. 2 , the sample gas pretreatment device includes a casing 1 , a heating end cover 3 disposed at one end of the casing 1 , and an intake air disposed at the other end of the casing 1 . Port 2 and a gas conduit 6 arranged in the housing 1, the heating end cover 3 is provided with an air outlet 4, and the air inlet 2, the gas conduit 6 and the gas outlet 4 are sequentially connected to Form the gas path of the sample gas to be tested;

The air inlet 2 is provided with a temperature and humidity sensor, the inner wall of the gas conduit 6 is provided with a heating device, and the main controller is respectively connected with the temperature and humidity sensor and the heating device, according to the detection of the temperature and humidity sensor. As a result, the heating device is controlled to work, so as to realize the constant temperature pretreatment of the sample gas to be measured;

The air outlet 4 is provided with a pressure sensor, a flow sensor and a flow controller, and the main controller is respectively connected with the pressure sensor, the flow sensor and the flow controller, according to the pressure sensor and the flow The detection result of the sensor controls the flow controller to work, so as to realize constant pressure and constant flow processing of the sample gas to be measured.

Preferably, the sample gas pretreatment device adopts a conduit-type gas path made of anti-corrosion and non-adsorbing materials. When the sample gas to be tested passes through the gas path, it can quickly pass through and realize the heating of the sample gas to be tested. Because the sample gas to be tested stays in the gas path, gas adsorption is caused, which causes the change of trace gas concentration, which ensures the reliability of low-concentration trace gas detection; at the same time, the heating device is arranged on the inner wall of the gas conduit, Will not hinder the flow of the sample gas to be tested, the pressure sensor, flow sensor and flow controller are arranged at the end of the gas path to accurately detect the temperature, humidity, pressure and flow of the heated sample gas to be tested, and The heat-treated gas directly enters the detection gas chamber, which ensures various detection indicators of the trace gas in the sample gas to be detected, and improves the detection accuracy, precision and reliability.

Preferably, the detection air chamber is made of anti-corrosion and non-adsorbing materials, each detection air chamber is provided with one of the sensor modules, and the sensor module is sealed in the detection air chamber through fasteners, and the user can Add corresponding sensor modules according to the trace gas to be detected; each detection gas chamber is connected end-to-end through an air duct, and the sample gas to be tested can flow through each sensor evenly, forming a fast channel for the sample gas to be tested, to avoid causing the sample to be tested. Gas residue affects the measurement accuracy.

Specifically, as shown in FIG. 3 and FIG. 4 , the sensor module includes a gas sensor, a signal amplification and processing circuit, and a single-chip microcomputer with a built-in A/D conversion unit,

The single-chip microcomputer receives the detection instruction, and controls the sensor to detect the sample gas to be tested according to the detection instruction;

The sensor generates an electrical signal and sends it to the signal amplification and processing circuit;

The signal amplification and processing circuit amplifies the electrical signal, and sends the amplified electrical signal to the A/D conversion unit for A/D conversion;

The single-chip microcomputer calculates the type and concentration of the trace gas in the sample gas to be measured according to the preset standard concentration signal and the digital signal obtained after conversion.

Specifically, as shown in FIG. 5 , the steps for obtaining the preset standard concentration signal are:

Step 1, the single-chip microcomputer receives a calibration instruction, and performs zero-point calibration of the sensor according to the calibration instruction;

Step 2, determine whether the zero point calibration is successful, if successful, perform standard concentration calibration; if unsuccessful, accumulate the times of zero point calibration and perform zero point calibration again, and determine that the sensor is faulty when three consecutive zero point calibrations are unsuccessful;

Step 3, determine whether the standard concentration calibration is successful, if successful, return the calibration success information and the standard concentration signal to the single-chip microcomputer; if it is unsuccessful, accumulate the times of standard concentration calibration, and when three consecutive standard concentration calibrations are unsuccessful It is determined that the sensor is faulty.

Specifically, the zero point calibration is specifically:

Oxygen standard gas containing no target trace gas is used as the zero point gas to be introduced into the detection chamber, and after a preset duration of ventilation, the value of the sensor is recorded every preset time interval within the next preset duration;

Respectively obtain an average recorded value of all recorded values within the preset time period of each sensor in the sensors, and the average recorded value of each sensor is its zero point value;

The zero point calibration method can achieve the effect of one ventilation, and the zero points of all sensors are calibrated together. Preferably, the preset time period is 5 minutes, and the preset time interval is 1 second.

Specifically, the standard concentration calibration is specifically:

Selecting a standard target trace gas and passing it into the detection air chamber, after a preset duration of ventilation, within the next preset duration, the value of the sensor is recorded every preset time interval;

An average recorded value is obtained for all recorded values of each sensor in the sensors within a preset time period, and the average recorded value of each sensor is its preset standard concentration signal.

The standard concentration calibration method can achieve the effect that the calibration points of all sensors are calibrated at one time after ventilation. Preferably, the preset duration is 5 minutes, and the preset time interval is 1 second.

Preferably, the preset duration is 5 minutes, the preset time interval is 1 second,

In the process of acquiring the above-mentioned preset standard concentration signal, since the atmospheric environment monitoring system selects an electrochemical sensor, and the electrochemical sensor needs a certain time to react to the target trace gas, and eventually the internal dynamic balance will be reached, that is, the output value will go up and down. The fluctuation of the output value, coupled with the influence of the external environment and surrounding circuits, aggravates the fluctuation of the output value. Intercepting and averaging the values within the preset time period is equivalent to integrating the output values at each moment, which reduces errors and makes the test results more accurate.

Since the sensor module calculates the accurate gas concentration value by comparing the electrical signal generated by the concentration of the gas to be measured with the preset standard concentration signal during the measurement, the sensor module needs to be zero-calibrated at any time. Calibrating the sensor module is an essential work to ensure accurate measurement of the sensor module.

It should be noted that: since the atmospheric environment monitoring device can add and replace the sensor module as needed, it is recommended to recalibrate the sensor module after adding and replacing; It is suggested to perform response detection on the sensor module with standard gas to ensure that the atmospheric environment monitoring device really plays a protective role.

Since the sensor module is sealed in the detection air chamber, the detection air chamber is installed in the box body end-to-end through an air duct, and the temperature of the box body will directly affect the detection air chamber, the The temperature of the sensor and the air duct thus affects the temperature of the pretreated sample gas to be measured, so in order that the external temperature does not affect the temperature of the pretreated sample gas to be measured, the atmospheric environment monitoring device further includes: A box temperature control unit, the box temperature control unit includes a temperature sensor arranged in the box, a heating sheet arranged at the bottom of the box and a cooling fan arranged at the top of the box, the main control The device is respectively connected to the temperature sensor, the heating plate and the cooling fan.

Specifically, the atmospheric environment monitoring device further includes a solar power supply, and the solar power supply includes a lithium battery and a solar battery. Preferably, the lithium battery is a 19.8Ah 3.7V lithium ion battery, which can be fully charged. It works continuously for more than 20 days, and the device automatically switches to the solar battery power supply mode when the sunlight is good during the day, and charges the lithium battery through the high-power fast charging circuit to ensure that the lithium battery can be quickly supplied under the condition of good sunlight in sunny days The battery is charged to avoid power outages caused by continuous rainy weather and the equipment stops working.

The atmospheric environment monitoring device uploads the trace gas detection results to the server through the wireless communication module, and the management platform is connected to the server to monitor the air environment quality in real time and realize online data query and statistical reports, and automatic online data. Comprehensive analysis of early warning and environmental protection information.

Finally it should be noted that: the above embodiment is only used to illustrate the technical scheme of the present invention and not to limit it; Although the present invention has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should understand: The specific embodiments of the invention are modified or some technical features are equivalently replaced; without departing from the spirit of the technical solutions of the present invention, all of them should be included in the scope of the technical solutions claimed in the present invention.

Claims (10)

1. a kind of Atmosphere Environment Monitoring System Bases, it is characterised in that: flat including multiple atmosphere environment supervision devices, server and management Platform, the atmosphere environment supervision device include cabinet and setting the intracorporal sample gas pretreatment unit of the case, master controller, Gas chamber and wireless communication module are detected, is provided with sensor module in the detection gas chamber,

The sample gas pretreatment unit is connect with the master controller, treats test sample gas according to the detection instruction of the master controller Carry out constant temperature, constant pressure and constant current pretreatment；

The sensor module is used to carry out minimum gas Concentration Testing to test sample gas to pretreated, and by trace gas physical examination It surveys result and returns to the master controller；

Trace gas detection result is uploaded to the server by the wireless communication module by the master controller；

The management platform is connect with the server, trace gas detection result described in real time inspection.

2. Atmosphere Environment Monitoring System Bases according to claim 1, it is characterised in that: the sample gas pretreatment unit includes shell Body, the heating end cap that described shell one end is arranged in, the air inlet that the shell other end is arranged in and setting are in the shell Intracorporal gas conduit, the fire end, which covers, is provided with gas outlet, the air inlet, the gas conduit and the gas outlet It is sequentially connected to form the gas circuit to test sample gas；

The air inlet is provided with Temperature Humidity Sensor, and the gas conduit inner wall is provided with heating device, the master controller It is connect respectively with the Temperature Humidity Sensor and the heating device, institute is controlled according to the testing result of the Temperature Humidity Sensor State heating device work；

The gas outlet is provided with pressure sensor, flow sensor and flow controller, the master controller respectively with it is described Pressure sensor, the flow sensor are connected with the flow controller, are passed according to the pressure sensor and the flow The testing result of sensor controls the flow controller work.

3. Atmosphere Environment Monitoring System Bases according to claim 1 or 2, it is characterised in that: the sensor module includes gas Body sensor, signal amplification and processing circuit and the single-chip microcontroller for being built-in with A/D converting unit,

The single-chip microcontroller receives detection instruction, controls the sensor detection to test sample gas according to detection instruction；

The sensor generates electric signal and is sent to the signal amplification and processing circuit；

The signal amplification and processing circuit amplify processing to the electric signal, and will be described in amplified electric signal feeding A/D converting unit carries out A/D conversion；

The single-chip microcontroller is calculated according to the digital signal obtained after preset standard concentration signal and conversion to trace gas in test sample gas The type and concentration of body.

4. Atmosphere Environment Monitoring System Bases according to claim 3, which is characterized in that the preset standard concentration signal obtains Take step are as follows:

Step 1, the single-chip microcontroller receives calibration instruction, and the Zero calibration of sensor is carried out according to the calibration instruction；

Step 2, judge whether Zero calibration succeeds, if not successfully, the number of accumulative Zero calibration simultaneously re-starts zero point mark It is fixed, and there are failures for judgement sensor when continuously Zero calibration is failed three times；If success, carries out normal concentration mark It is fixed；

Step 3, whether judgment criteria concentration calibration succeeds, if success, to the single-chip microcontroller return calibration successful information and Normal concentration signal；If failed, the number of accumulated standard concentration calibration, and continuously normal concentration calibration is failed three times When determines sensor, and there are failures.

5. Atmosphere Environment Monitoring System Bases according to claim 4, which is characterized in that the Zero calibration specifically:

It is passed through in the detection gas chamber using the oxygen calibrating gas without target minimum gas as zero gas, when ventilation is default After length, in next preset duration, the numerical value of the primary sensor is recorded every prefixed time interval；

Average record value, Mei Gechuan are sought to all record values in each sensor preset duration in the sensor respectively The average record value of sensor is its zero point value.

6. Atmosphere Environment Monitoring System Bases according to claim 4, which is characterized in that the normal concentration calibration specifically:

Selection standard target minimum gas is passed through in the detection gas chamber, after preset duration of ventilating, in next preset duration, The numerical value of the primary sensor is recorded every prefixed time interval；

Average record value, Mei Gechuan are sought to all record values in each sensor preset duration in the sensor respectively The average record value of sensor is its preset standard concentration signal.

7. Atmosphere Environment Monitoring System Bases according to claim 1 or 2, it is characterised in that: the atmosphere environment supervision device Further include spin manifold temperature control unit, the spin manifold temperature control unit include setting the intracorporal temperature sensor of the case, The heating sheet of the bottom of box is set and the cooling fan at top described in cabinet is set, the master controller is separately connected The temperature sensor, the heating sheet and the cooling fan.

8. Atmosphere Environment Monitoring System Bases according to claim 1 or 2, it is characterised in that: the atmosphere environment supervision device It further include GPS positioning module, the GPS positioning module is used to obtain the position of the distributed atmosphere environment supervision device in real time Information is simultaneously uploaded to the server by the wireless communication module.

9. Atmosphere Environment Monitoring System Bases according to claim 1 or 2, it is characterised in that: the atmosphere environment supervision device It further include solar powered power supply.

10. Atmosphere Environment Monitoring System Bases according to claim 1 or 2, it is characterised in that: the master controller uses MSP430F67471A single-chip microcontroller.