CN116293473A - Improved generation pipeline sonar wet end processing apparatus - Google Patents

Abstract

The invention relates to the technical field of underwater acoustic signal detection, in particular to an improved pipeline sonar wet end processing device, which mainly consists of five parts: a transducer, a conductive slip ring and a stepping motor, a receiving preprocessing circuit, a processing circuit and a transmitting circuit composition; the processing circuit is sequentially connected with the receiving preprocessing circuit, the conductive slip ring, the stepping motor, and the transducer, and the processing circuit is sequentially connected with the transmitting circuit, the conductive slip ring and the stepper The input motor is connected, and the processing circuit delivers the processed data to the display and control device through the Ethernet interface. The invention can be used for multi-channel parallel operation of the pipeline sonar in the underwater acoustic field, and can improve the processing efficiency and pipeline detection efficiency of the pipeline sonar compared with the traditional pipeline sonar.

Description

An improved pipeline sonar wet end processing device

technical field

The invention relates to the technical field of underwater acoustic signal detection, in particular to an improved pipeline sonar wet end processing device.

Background technique

1. The basic situation of traditional technology:

At present, domestic and foreign technologies are relatively mature for the detection methods of the underground pipe network in the anhydrous state (CCTV: Closed Circuit Television of the Drainage Pipeline Condition), but the detection methods for the water-rich and full-water conditions are very scarce. The traditional plugging-pumping-dredging-detection method is time-consuming and laborious, and there are hidden dangers to the safety of personnel going down the well, so it is urgent to use advanced technical means to replace it. The diameter of rainwater and sewage pipes is mostly between 400mm and 1200mm, and the environment inside rainwater pipes and sewage pipes is slightly different. The water quality in the rainwater pipe is relatively clear, but there are a lot of suspended matter, and the floating matter is relatively simple, such as branches and leaves; the sewage pipe is mostly black and smelly water, and the floating matter is diverse: plastic products, steel wool, and other household garbage, strong smell, harmful gases such as hydrogen sulfide, etc. . It is necessary to detect structural defects such as rupture, deformation, misalignment, ups and downs, disconnection, branch pipe connection, deposition, foreign matter insertion, etc. in the pipeline.

Optical equipment such as cameras are severely limited under the condition of full water, and the best detection method is to use sonar for detection. Existing sonar detection technology usually adopts single-beam mechanical sweep sonar (pipeline sonar), which can only scan the cross section of the pipeline with a slow scanning rate, and can only detect deformation, siltation, and hidden connection of branch pipes. Other defects, such as cracks, are too low resolution and too difficult to detect practically. In addition, the detection efficiency of single-beam sonar is low (mechanical rotation scanning, image needs to be reconstructed).

2. Disadvantages of traditional technology:

Traditional pipeline sonar has the following disadvantages:

(1) Low measurement efficiency and long time-consuming: The traditional pipeline sonar is mainly a single-beam mechanical ring-scan sonar. Its working principle is mainly to control the single-channel transducer to rotate one circle through the rotation of the built-in motor of the equipment to realize the signal collection of the pipe network for one circle. This working method is limited by the sonar echo transmission time and processing time. As a result, the motor cannot rotate too fast, and the underwater robot for pipe network detection cannot run too fast, otherwise it will cause frame loss in the pipe network detection image.

(2) Low resolution: limited by the working frequency of sonar, the working center frequency of traditional pipeline sonar is not greater than 2.5MHz, and its horizontal and vertical opening angle resolution is also above 1.5°.

The technical problem to be solved in the present invention mainly has the following aspects:

(1) Improve the efficiency of pipeline sonar detection and speed up the efficiency of pipeline sonar inspection of urban pipeline networks.

(2) Improve the resolution of pipeline sonar.

Contents of the invention

Aiming at the deficiencies of the prior art, the invention discloses an improved pipeline sonar wet end processing device and its structure. The invention can be used for multi-channel parallel operation of pipeline sonar in the field of underwater acoustics. Compared with traditional pipeline sonar, The processing efficiency and pipeline detection efficiency of the pipeline sonar can be improved.

The present invention is achieved through the following technical solutions:

An improved pipeline sonar wet end processing device, which is mainly composed of five parts: a transducer, a conductive slip ring, a stepping motor, a receiving preprocessing circuit, a processing circuit, and a transmitting circuit; The processing circuit, the conductive slip ring, the stepping motor, and the transducer are connected, and the processing circuit is connected with the transmitting circuit, the conductive slip ring and the stepping motor in turn, and the processing circuit will process the The data is delivered to the display and control device through the Ethernet interface.

Preferably, the housing cross section of the transducer is arranged in a regular hexagonal structure, and six transducer probes are uniformly arranged on the circumferential surface of the transducer housing, and the transducer probes are composed of The stepping motor drives the rotation, and rotates more than 60 circles in 1 minute.

Preferably, the function of the conductive slip ring is to transmit electrical signals, and at the same time, its connection can also transmit electricity when it is relatively rotated, and the wires will not be entangled. The stator end of the conductive slip ring is connected to the stepper motor to form a fixed part , the rotor end drives the transducer with six transducer probes.

Preferably, the conductive slip ring is customized and designed with seven coils.

Preferably, the stepping motor has high torque, low temperature rise, adopts numerical control winding, has high consistency, and adopts a circular design in structural design.

Preferably, the receiving preprocessing circuit mainly consists of the following three parts:

The fixed amplifier circuit uses AD8222 dual-channel, high-performance instrument amplifier to realize pre-stage impedance matching and fixed-gain amplification. The gain is set to 10-20dB. AD8222 is packaged in a small 4mm×4mmLFCSP;

The voltage-controlled amplifier circuit uses TI's 8-channel, ultra-low power consumption variable gain amplifier VCA8500 chip with a low-noise preamplifier;

The local oscillator circuit uses the special DDS chip AD9834 of ADI Company to realize the generation of the local oscillator frequency.

Preferably, the VCA8500 chip has a built-in fixed pre-amplifier circuit, a programmable attenuation circuit and a programmable gain amplifier circuit to achieve a dynamic gain control of 46dB.

Preferably, when the local oscillator circuit is working, the single-chip microcomputer configuration generates a fixed frequency of 6 MHz to mix with the signal at the receiving end, and then realizes the I-channel signal and the Q-channel signal at the low-frequency end through a low-pass filter, and then realizes it through the built-in ADC of the single-chip microcomputer Data collection; the mixer uses the NE602 mixer of Signetics Company, the cut-off frequency of the low-pass filter is set to 200kHz, and the low-pass filter is built through the operational amplifier to realize the low-pass filtering of the signal.

Preferably, described processing circuit is with FPGA, MCU as control core, and described FPGA selects the XC7A100TCSG section FPGA chip of the Artix7 series of Xilinx Company for use, and described MCU selects the STM32F407 section single-chip microcomputer of STMicroelectronics for use.

Preferably, the transmitting circuit consists of the following three parts:

The emission excitation signal generation circuit is used to realize the original required working frequency, working pulse width and working bandwidth;

A power amplifier circuit, used to realize the conversion of the transmission excitation signal from a digital PWM signal to an analog signal, and then realize power amplification and convert it into a high-voltage signal;

The matching circuit is used to realize the matching of capacitive reactance and inductive reactance between the transmitting circuit and the transducer, so as to ensure that the transmitting waveform is not distorted.

The present invention has the following beneficial effects:

(1) The wet end design of the improved pipeline sonar adopts 6 sub-transducers evenly divided into equal angles on the circular surface. Under other conditions unchanged, the detection efficiency can be increased by 6 times in theory.

(2) Optimize the circuit design of the improved pipeline sonar wet end processing system, increase the sonar operating frequency to 6MHz, and realize the horizontal and vertical opening angle resolution of the improved pipeline sonar is 0.8°, compared with the traditional pipeline sonar Double the resolution.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the overall functional block diagram of the pipeline sonar of the present invention.

Fig. 2 is a working schematic diagram of the conductive slip ring of the present invention.

Fig. 3 is a schematic diagram of wiring of the conductive slip ring of the present invention; wherein (a) is a side sectional view, (b) is a side view, and (c) is a front sectional view.

Fig. 4 is a block diagram of the internal structure of the AD8222 chip of the present invention.

Fig. 5 is a block diagram of the internal structure of the VCA8500 chip of the present invention.

Fig. 6 is a functional block diagram of the processing circuit of the present invention.

Fig. 7 is a functional block diagram of the transmitting circuit of the present invention.

In the figure: 1-transducer, 2-conductive slip ring and stepping motor, 3-receiving preprocessing circuit, 4-processing circuit, 5-transmitting circuit.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Figures 1 to 7, the embodiment of the present invention provides a technical solution for an improved pipeline sonar wet end processing device, which mainly consists of a transducer 1, a conductive slip ring and a stepping motor 2, and a receiving preprocessing circuit 3 , the processing circuit 4 and the transmitting circuit 5 are composed of five parts; the processing circuit 4 is connected with the receiving preprocessing circuit 3, the conductive slip ring and the stepping motor 2, and the transducer 1 in turn, and the processing circuit 4 is connected with the transmitting circuit 5 and the conductive slip ring in turn and the stepper motor 2, and the processing circuit 4 delivers the processed data to the display and control device through the Ethernet interface.

The cross-section of the shell of the transducer 1 is arranged in a regular hexagonal structure, and six transducer probes are evenly distributed on the circumferential surface of the shell of the transducer 1, and the transducer probes are rotated by a stepping motor. Rotate more than 60 times in 1 minute. Specifically: the casing of the pipeline sonar transducer works at a normal temperature underwater, a sealing ring and sealant are added between the metal and non-metal casings, and the internal and external power and signals of the instrument are connected by the sealing joint. The transducer 1 is composed of six probes, which are evenly distributed in a regular hexagon. The probes are driven by a stepping motor to rotate more than 60 times in one minute. The whole instrument is filled with light wax oil to dissipate heat.

As shown in Figure 2, the role of the conductive slip ring is to transmit electrical signals. At the same time, the connection can also transmit electricity when it is rotated relatively. The wires will not be entangled. The stator end of the conductive slip ring is connected to the stepping motor to form a fixed part. Drives the transducers that route the six transducer probes.

As shown in Figure 3, the conductive slip ring adopts a customized method and is designed with seven coils.

The stepper motor has high torque, low temperature rise, adopts numerical control winding, high consistency, and adopts circular design in structural design, which can save space.

The receiving preprocessing circuit 3 is mainly composed of the following three parts:

The fixed amplifier circuit uses AD8222 dual-channel, high-performance instrumentation amplifier to realize pre-stage impedance matching and fixed-gain amplification. In order to increase the dynamic range of the system as much as possible, the gain setting can be appropriately reduced (10-20dB). The AD8222 is packaged in a small 4mm×4mmLFCSP, and the internal structure of the chip is shown in Figure 4;

The voltage-controlled amplifying circuit is an 8-channel ultra-low power consumption variable gain amplifier VCA8500 with a low-noise preamplifier from TI. The internal functional block diagram of the chip is shown in Figure 5. The VCA8500 chip has a built-in fixed preamplifier circuit, programmable attenuation circuit and programmable gain amplifier circuit to achieve a dynamic gain control of 46dB;

For the local oscillator circuit, the special DDS chip AD9834 of ADI Company is selected to realize the generation of local shock frequency, and the special DDS chip AD9834 of ADI Company is selected to realize the generation of local shock frequency. AD9834 can generate the highest frequency of 37.5MHz. The fixed frequency 6MHz is generated by the configuration of the single-chip microcomputer to mix with the signal of the receiving end, and then the I-channel signal and the Q-channel signal of the low-frequency end are realized through a low-pass filter, and then the data acquisition is realized through the built-in ADC of the single-chip microcomputer. The mixer selects the NE602 mixer of Signetics Company, the cut-off frequency of the low-pass filter is set to 200kHz, and the low-pass filter is built through the operational amplifier to realize the low-pass filtering of the signal.

As shown in Figure 6, the processing circuit 4 uses FPGA and MCU as the control core, wherein the FPGA chip is the FPGA chip XC7A100TCSG of the Artix7 series of Xilinx Company, and the MCU is the STM32F407 single-chip microcomputer of STMicroelectronics.

As shown in FIG. 7 , the transmitting circuit 5 is composed of a transmitting excitation signal generating circuit, a power amplifier circuit and a matching circuit. The transmitting excitation signal generating circuit mainly realizes the original required operating frequency, operating pulse width, and operating bandwidth. The main function of the power amplifier circuit is to realize the conversion of the transmission excitation signal from a digital PWM signal to an analog signal, and then realize power amplification and convert it into a high-voltage signal. The matching circuit is mainly to realize the capacitive reactance and inductive reactance matching between the transmitting circuit and the transducer, so as to ensure that the transmitting waveform is not distorted.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An improved pipeline sonar wet end processing device is characterized by mainly comprising a transducer, a conductive slip ring, a stepping motor, a receiving pretreatment circuit, a processing circuit and a transmitting circuit; the processing circuit is sequentially connected with the receiving pretreatment circuit, the conductive slip ring, the stepping motor and the transducer, the processing circuit is sequentially connected with the transmitting circuit, the conductive slip ring and the stepping motor, and the processing circuit realizes the delivery of the processed data and the display control equipment through an Ethernet interface.

2. The improved pipeline sonar wet end processing device of claim 1, wherein the cross section of the shell of the transducer is in a regular hexagonal structure, six transducer probes are uniformly distributed on the circumferential surface of the shell of the transducer, and the transducer probes are driven to rotate by the stepping motor and rotate for more than 60 circles within 1 minute.

3. An improved pipeline sonar wet end processing device as defined in claim 1, wherein said conductive slip ring is used for transmitting electrical signals, and the relative rotation of the connection is also used for transmitting electricity, the wire is not wound, said stepping motor is connected to form a fixed part through the stator end of said conductive slip ring, and the rotor end drives the transducers arranged with six transducer probes.

4. An improved pipeline sonar wet end processing device as defined in claim 3, wherein said conductive slip ring is custom-made and is designed with seven coils.

5. An improved pipeline sonar wet end processing device as defined in claim 3, wherein said stepper motor has a high torque, low temperature rise, and is digitally controlled by wire winding, with high consistency, and is structurally designed in a circular shape.

6. An improved pipeline sonar wet end processing device as defined in claim 1, wherein said receiving preprocessing circuit consists essentially of:

the fixed amplifying circuit is an AD8222 dual-channel high-performance instrument amplifier, so that front-stage impedance matching and fixed gain amplification are realized, the gain is set to be 10-20 dB, and the AD8222 is packaged by adopting a small-sized 4mm multiplied by 4mm LFCP;

the voltage-controlled amplifying circuit selects an 8-channel ultralow-power-consumption variable gain amplifier VCA8500 chip with a low-noise preamplifier of TI company;

and the local oscillation circuit is used for realizing the generation of the local oscillation frequency by selecting a special DDS chip AD9834 of ADI company.

7. The improved pipeline sonar wet end processing device of claim 6, wherein said VCA8500 chip incorporates a fixed pre-amplifier circuit, programmable attenuation circuit and programmable gain amplifier circuit to achieve 46dB of dynamic gain control.

8. The improved pipeline sonar wet end processing device as defined in claim 6, wherein when said local oscillation circuit works, a fixed frequency of 6MHz is generated by configuration of a single chip microcomputer to be mixed with a signal of a receiving end, then an I-path signal and a Q-path signal of a low frequency end are realized by a low pass filter, and then data acquisition is realized by a built-in ADC of the single chip microcomputer; the mixer is an NE602 type mixer of Signetics company, the cut-off frequency of the low-pass filter is set to be 200kHz, and the low-pass filter is built through the operational amplifier to realize low-pass filtering of signals.

9. The improved pipeline sonar wet end processing device as defined in claim 1, wherein said processing circuit uses FPGA and MCU as control cores, said FPGA uses an XC7a100TCSG type FPGA chip of the Artix7 series of Xilinx company, said MCU uses an STM32F407 type singlechip of an artificial semiconductor.

10. An improved pipeline sonar wet end processing device as defined in claim 1, wherein said transmitting circuit is comprised of three parts:

the emission excitation signal generation circuit is used for realizing the originally required working frequency, working pulse width and working bandwidth;

the power amplifying circuit is used for converting a transmitting excitation signal from a digital PWM signal to an analog signal and converting power amplification to a high-voltage signal;

and the matching circuit is used for realizing the matching of capacitive reactance and inductive reactance between the transmitting circuit and the transducer and ensuring that the transmitting waveform is not distorted.

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