阅读说明：本技术 一种基于地下管道的弹性导波无线通信系统及方法 (Elastic guided wave wireless communication system and method based on underground pipeline ) 是由 宦惠庭 黄丽萍 詹劲松 彭翠玲 刘丽娴 于 2021-08-05 设计创作，主要内容包括：本发明涉及管道无线通信领域,特别是一种基于地下管道的弹性导波无线通信系统及方法,其特征是：至少包括地上通信单元(2)、地下通信单元(1)；所述地下通信单元(1)包括第一控制单元(3)、环形换能器(4)、管道(5)、条形换能器(6)、无线信号发送单位(7)、传感器组(31)、第一控制单元微控制器(32)；所述地上通信单元(2)包括：无线信号发送单位(7)、天线(8)、第二控制单元(9)。它以便能对多节用螺旋接头连接或者无缝焊接起来的地下管道进行通信,最终建立全无线地上地下管道通信网络,解决易燃易爆资源的管道传输中的检测和通信。(The invention relates to the field of pipeline wireless communication, in particular to an elastic guided wave wireless communication system and method based on an underground pipeline, which is characterized in that: the system at least comprises an above-ground communication unit (2) and an underground communication unit (1); the underground communication unit (1) comprises a first control unit (3), an annular transducer (4), a pipeline (5), a strip-shaped transducer (6), a wireless signal sending unit (7), a sensor group (31) and a first control unit microcontroller (32); the above-ground communication unit (2) comprises: a wireless signal transmission unit (7), an antenna (8), and a second control unit (9). The method can conveniently communicate multiple sections of underground pipelines connected by spiral joints or welded seamlessly, finally establish a full-wireless underground pipeline communication network, and solve the detection and communication in the pipeline transmission of flammable and explosive resources.)

1. The utility model provides an elasticity guided wave wireless communication system based on underground pipeline which characterized by: the system at least comprises an above-ground communication unit (2) and an underground communication unit (1);

the underground communication unit (1) comprises a first control unit (3), an annular transducer (4), a pipeline (5), a strip-shaped transducer (6), a wireless signal sending unit (7), a sensor group (31) and a first control unit microcontroller (32);

the above-ground communication unit (2) comprises: a wireless signal transmission unit (7), an antenna (8), and a second control unit (9);

the first control unit microcontroller (32) acquires pipeline information to be transmitted by acquiring the sensor group (31), sends elastic guided waves to the inner wall of the pipeline (5) by controlling the annular transducer (4), converts electric signal information of the first control unit microcontroller (32) into high-frequency pipeline radial vibration mechanical waves, and transmits the high-frequency pipeline radial vibration mechanical waves on the pipeline (5) in the form of the elastic waves;

the bar-shaped transducer (6) array at the other end of the pipeline (5) is used as an acoustoelectric transducer for receiving elastic guided waves of the inner wall of the pipeline, and an electric signal generated by the acoustoelectric transducer is wirelessly transmitted to a second control unit (9) by a wireless signal transmitting unit (7) and an antenna (8) for reading; a signal processing circuit and a demodulation link of a second control unit (9) realize wireless communication between the environment information and the internal information of the underground pipeline through an external antenna of the ground communication unit (1), and a microcontroller (91) of the second control unit displays the information on a liquid crystal screen display unit (92) to realize the full-wireless network communication between the ground and the underground pipeline;

the annular transducer (4) is used as an acoustic-electric transducer for sending elastic guided waves of the inner wall of the pipeline, converts electric signal information of the first control unit (3) into high-frequency pipeline radial vibration mechanical waves and transmits the high-frequency pipeline radial vibration mechanical waves on the pipeline (5) in the form of elastic waves; the bar-shaped transducer (6) array is used as an acoustoelectric transducer for receiving the elastic guided waves of the inner wall of the pipeline (5), and the acoustoelectric transducer and the wireless signal sending module receive the elastic guided waves of the inner wall of the pipeline and convert the elastic guided waves into electric signals; and finally, the underground pipeline environment information and the internal information are displayed on a liquid crystal screen through a signal processing circuit and a demodulation link of the second control unit (9), so that the full-wireless ground and underground pipeline network communication is realized.

2. The elastic guided wave wireless communication system based on the underground pipeline as claimed in claim 1, wherein: the above-ground communication unit (2) comprises at least: the device comprises an antenna (8), a second unit power supply module (911), a second unit band-pass filter (912), a second unit power amplifier (913), an ADC conversion circuit (915), a signal demodulation (914), a second control unit microcontroller (916) and a display unit (92); the second unit power supply module (911) supplies voltages required by the second unit band-pass filter (912), the second unit power amplifier (913), the signal demodulation (914), the ADC conversion circuit (915), the second control unit microcontroller (916) and the display unit (92), the antenna (8) filters received wireless information through the second unit band-pass filter (912), then the signal is amplified through the second unit power amplifier (913), the signal is demodulated through the signal demodulation (914), the demodulated signal is converted into a digital signal through the ADC conversion circuit (915), the digital signal is processed through the second control unit microcontroller (916), and finally the display unit (92) displays the environment temperature and humidity of the underground pipeline and pipeline internal information such as pipeline internal fluid speed, fluid level and pipeline internal pressure.

3. The elastic guided wave wireless communication system based on the underground pipeline as claimed in claim 1, wherein: the first control unit (3) at least comprises a sensor group (31), a first control unit microcontroller (32), a first unit power module (321), a signal amplification circuit (322), a signal filtering circuit (323), a nonlinear correction circuit (324), a signal conversion circuit (325), a first signal processing unit (326), a band-pass filter (327) and a power amplifier circuit (328); the sensor group (31), the first control unit microcontroller (32), the first unit power module (321), the signal amplification circuit (322), the signal filtering circuit (323), the nonlinear correction circuit (324), the signal conversion circuit (325), the first signal processing unit (326), the band-pass filter (327) and the power amplifier circuit (328) are electrically connected in sequence; the information collected by the sensor group (31) sequentially passes through a signal amplification circuit (322), a signal filter circuit (323), a nonlinear correction circuit (324), a signal conversion circuit (325) and a first signal processing unit (326) which are electrically connected, the first signal processing unit (326) demodulates signals to convert various measured physical quantities of the sensor group (31) into packed electric signals, the packed electric signals are converted into certain frequency by a power amplifier circuit (328) and a band-pass filter (327), and the electric signals with certain amplitude drive the annular transducer (4) to work.

4. The elastic guided wave wireless communication system based on the underground pipeline as claimed in claim 1, wherein: the wireless signal transmitting module at least comprises a wireless signal transmitting power supply module (72), a wireless transmitting signal processor (71), a signal modulating unit (73) and a power output circuit (74), the frequency of pipeline elastic guided wave transmission is generally low-frequency signals, so that the wireless transmitting signal processor (71) is required to modulate signals to the frequency suitable for ground wireless communication through the signal modulating unit (73), and finally the power output circuit (74) drives an antenna (8) to perform wireless transmission.

5. The elastic guided wave wireless communication system based on the underground pipeline as claimed in claim 2, wherein: the band pass filter is designed into the frequency band that is fit for pipeline elastic wave transmission, filters out the clutter in other frequency bands, and the band pass filter includes: a band pass filter (327) and a second unit band pass filter (912).

6. The elastic guided wave wireless communication system based on the underground pipeline as claimed in claim 5, wherein: the electric signal suitable for the elastic wave transmission of the pipeline is converted into a low-frequency signal with the frequency band of 20KHz-50KHz of the radial vibration mechanical wave of the pipeline.

7. The elastic guided wave wireless communication system based on the underground pipeline as claimed in claim 3, wherein: the power amplifier circuit (328) is used for amplifying the power required by the conversion work of the acoustoelectric transducer, the power is the acoustoelectric transducer which transmits information from one end of the pipeline to the other end of the pipeline and takes the annular transducer (4) as the elastic guided wave of the inner wall of the pipeline, and the strip-shaped transducer (6) array is used as the required power of the acoustoelectric transducer which receives the elastic guided wave of the inner wall of the pipeline.

8. An elastic guided wave wireless communication method based on an underground pipeline is characterized in that: the first step is as follows: acquiring pipeline mode electrical information of the speed of fluid in the pipeline, the liquid level of the fluid and the pressure intensity in the pipeline by a sensor group;

the second step is that: filtering, amplifying and digitally processing the signals of the first step by a first control unit;

the third step: packing the fluid speed, the fluid liquid level and the pressure inside the pipeline according to classification;

the fourth step: amplifying the power of the packed signal, driving an annular energy transducer, and exciting a transmitting acoustoelectric transducer to generate elastic guided waves on the inner wall of the pipeline;

the fifth step: receiving elastic guided waves of the inner wall of the pipeline sent by a sending end by an acoustic-electric transducer received by a strip-shaped transducer;

and a sixth step: wirelessly transmitting to the ground processor by the ground communication unit 2;

the seventh step: the ground processor unpacks the received information and displays the unpacked information on a terminal.

9. The method of claim 8, wherein the method comprises the following steps: the method is characterized in that the speed of fluid in the pipeline, the liquid level of the fluid and the pressure in the pipeline are packed according to classification, the data are arranged according to byte sequence, and the number of bytes of the speed of the fluid in the pipeline, the liquid level of the fluid and the pressure in the pipeline respectively comprises check bits.

Technical Field

The invention relates to the field of pipeline wireless communication, in particular to an elastic guided wave wireless communication system and method based on an underground pipeline, which are suitable for realizing pipeline communication by transmitting long-distance underground pipeline signals with a plurality of pipeline interfaces or seamless welding through elastic guided waves on the inner wall of the pipeline.

Background

Under the condition of solving the problem of uneven resource distribution of each region, the method mainly adopts a pipeline conveying method. With the arrival of the digital era, the working condition data inside the pipeline needs to be transmitted to the monitoring center in real time in the working process of the pipeline, so that the operation of workers in the next step is facilitated. From the current situation, the pipeline signal transmission mostly adopts a wired or wireless communication mode as a main mode, and the working condition data inside the pipeline is sent to the pipeline monitoring center end in real time. Both wireless communication and wired communication transmit signals through electromagnetic waves, but for the transmission of flammable and explosive oil gas resources such as natural gas, liquefied gas and the like, the signals cannot be transmitted by using an electromagnetic field, an electric field ignition phenomenon can be generated, and a fire disaster is easily caused. Therefore, in some natural gas and liquefied gas environments, electromagnetic fields are not used for transmitting signals.

Thus, improvements to the elastic guided wave wireless communication system based on underground pipes can be made from three aspects: (1) the communication channel of an elastic guided wave wireless communication system based on underground pipes is a pipe. Compared with other communication systems which need to build a network environment underground, the pipeline is used as a communication channel, the requirement on the network environment is not high, and the signal transmission is more stable and reliable. (2) The elastic guided waves of the inner wall of the pipeline are used as underground transmission signals. First, signal attenuation is very strong in the pipeline transmission process relative to underground wireless 4G, wifi and other microwave signals, and pipeline inner wall elastic guided waves are used as underground pipeline transmission signals, have high propagation speed and small attenuation in the pipeline, can carry out remote transmission, and are favorable for communication. And secondly, the elastic guided waves on the inner wall of the pipeline are used as underground pipeline transmission signals, so that an electromagnetic field cannot appear around the pipeline, and the phenomenon of electromagnetic ignition is avoided. The elastic guided wave is used as a transmission signal, so that the problem of environmental limitation of liquefied gas and natural gas is solved, the equipment cost is reduced, and the like, and the elastic guided wave becomes a current research hotspot. (3) The elastic guided waves of the inner wall of the pipeline received by the other end of the pipeline are sent through the antenna, the liquid crystal screen at the monitoring end receives signals, the working condition of the pipeline and the like are watched in real time, and the underground and aboveground full wireless communication is realized.

The transmission and the reception of the elastic waves of the inner wall of the pipeline in the underground pipeline communication process can be oscillated according to the resonance of the piezoelectric crystal, namely, the piezoelectric effect. If an electric field is applied around the piezoceramic material, the piezoceramic material can generate small deformation, which is a process for converting electric energy into mechanical energy, and the process can be used for sending elastic guided wave signals on the inner wall of the pipeline. The piezoelectric ceramic is sensitive to pressure, a force is applied to the outside of the piezoelectric ceramic material on the surface of the piezoelectric ceramic material, electric charges can be generated on the surface of the piezoelectric ceramic material, the process of converting mechanical energy into electric energy is achieved, and the process can be used for receiving elastic guided wave signals of the inner wall of the pipeline. Then, the received elastic guided wave signals of the inner wall of the pipeline are analyzed and processed, so that the aim of transmitting the wireless signals of the underground pipeline can be fulfilled.

At present, the research technology of the wireless communication system of the multiple underground pipelines is only limited in the discussion of the theory, the research of the system design is lacked, and in addition, the coupling between the ultrasonic transducer and the medium is not better solved.

Disclosure of Invention

The invention aims to provide an elastic guided wave wireless communication system and method based on underground pipelines, so that a plurality of underground pipelines connected by spiral joints or welded seamlessly can be communicated, a full-wireless underground pipeline communication network is finally established, and detection and communication in pipeline transmission of flammable and explosive resources are realized.

The invention aims to realize the elastic guided wave wireless communication system based on the underground pipeline, which is characterized in that: the system at least comprises an above-ground communication unit (2) and an underground communication unit (1);

the underground communication unit (1) comprises a first control unit (3), an annular transducer (4), a pipeline (5), a strip-shaped transducer (6), a wireless signal sending unit (7), a sensor group (31) and a first control unit microcontroller (32);

the above-ground communication unit (2) comprises: a wireless signal transmission unit (7), an antenna (8), and a second control unit (9);

the first control unit microcontroller (32) acquires pipeline information to be transmitted by acquiring the sensor group (31), sends elastic guided waves to the inner wall of the pipeline (5) by controlling the annular transducer (4), converts electric signal information of the first control unit microcontroller (32) into high-frequency pipeline radial vibration mechanical waves, and transmits the high-frequency pipeline radial vibration mechanical waves on the pipeline (5) in the form of the elastic waves;

the bar-shaped transducer (6) array at the other end of the pipeline (5) is used as an acoustoelectric transducer for receiving elastic guided waves of the inner wall of the pipeline, and an electric signal generated by the acoustoelectric transducer is wirelessly transmitted to a second control unit (9) by a wireless signal transmitting unit (7) and an antenna (8) for reading; a signal processing circuit and a demodulation link of a second control unit (9) realize wireless communication between the environment information and the internal information of the underground pipeline through an external antenna of the ground communication unit (1), and a microcontroller (91) of the second control unit displays the information on a liquid crystal screen display unit (92) to realize the full-wireless network communication between the ground and the underground pipeline;

the annular transducer (4) is used as an acoustic-electric transducer for sending elastic guided waves of the inner wall of the pipeline, converts electric signal information of the first control unit (3) into high-frequency pipeline radial vibration mechanical waves and transmits the high-frequency pipeline radial vibration mechanical waves on the pipeline (5) in the form of elastic waves; the bar-shaped transducer (6) array is used as an acoustoelectric transducer for receiving the elastic guided waves of the inner wall of the pipeline (5), and the acoustoelectric transducer and the wireless signal sending module receive the elastic guided waves of the inner wall of the pipeline and convert the elastic guided waves into electric signals; and finally, the underground pipeline environment information and the internal information are displayed on a liquid crystal screen through a signal processing circuit and a demodulation link of the second control unit (9), so that the full-wireless ground and underground pipeline network communication is realized.

The above-ground communication unit (2) comprises at least: the device comprises an antenna (8), a second unit power supply module (911), a second unit band-pass filter (912), a second unit power amplifier (913), an ADC conversion circuit (915), a signal demodulation (914), a second control unit microcontroller (916) and a display unit (92); the second unit power supply module (911) supplies voltages required by the second unit band-pass filter (912), the second unit power amplifier (913), the signal demodulation (914), the ADC conversion circuit (915), the second control unit microcontroller (916) and the display unit (92), the antenna (8) filters received wireless information through the second unit band-pass filter (912), then the signal is amplified through the second unit power amplifier (913), the signal is demodulated through the signal demodulation (914), the demodulated signal is converted into a digital signal through the ADC conversion circuit (915), the digital signal is processed through the second control unit microcontroller (916), and finally the display unit (92) displays the environment temperature and humidity of the underground pipeline and pipeline internal information such as pipeline internal fluid speed, fluid level and pipeline internal pressure.

The first control unit (3) at least comprises a sensor group (31), a first control unit microcontroller (32), a first unit power module (321), a signal amplification circuit (322), a signal filtering circuit (323), a nonlinear correction circuit (324), a signal conversion circuit (325), a first signal processing unit (326), a band-pass filter (327) and a power amplifier circuit (328); the sensor group (31), the first control unit microcontroller (32), the first unit power module (321), the signal amplification circuit (322), the signal filtering circuit (323), the nonlinear correction circuit (324), the signal conversion circuit (325), the first signal processing unit (326), the band-pass filter (327) and the power amplifier circuit (328) are electrically connected in sequence; the information collected by the sensor group (31) sequentially passes through a signal amplification circuit (322), a signal filter circuit (323), a nonlinear correction circuit (324), a signal conversion circuit (325) and a first signal processing unit (326) which are electrically connected, the first signal processing unit (326) demodulates signals to convert various measured physical quantities of the sensor group (31) into packed electric signals, the packed electric signals are converted into certain frequency by a power amplifier circuit (328) and a band-pass filter (327), and the electric signals with certain amplitude drive the annular transducer (4) to work.

The wireless signal transmitting module at least comprises a wireless signal transmitting power supply module (72), a wireless transmitting signal processor (71), a signal modulating unit (73) and a power output circuit (74), the frequency of pipeline elastic guided wave transmission is generally low-frequency signals, so that the wireless transmitting signal processor (71) is required to modulate signals to the frequency suitable for ground wireless communication through the signal modulating unit (73), and finally the power output circuit (74) drives an antenna (8) to perform wireless transmission.

The band pass filter is designed into the frequency band that is fit for pipeline elastic wave transmission, filters out the clutter in other frequency bands, and the band pass filter includes: a band pass filter (327) and a second unit band pass filter (912).

The electric signal suitable for the elastic wave transmission of the pipeline is converted into a low-frequency signal with the frequency band of 20KHz-50KHz of the radial vibration mechanical wave of the pipeline.

The power amplifier circuit (328) is used for amplifying the power required by the conversion work of the acoustoelectric transducer, the power is the acoustoelectric transducer which transmits information from one end of the pipeline to the other end of the pipeline and takes the annular transducer (4) as the elastic guided wave of the inner wall of the pipeline, and the strip-shaped transducer (6) array is used as the required power of the acoustoelectric transducer which receives the elastic guided wave of the inner wall of the pipeline.

An elastic guided wave wireless communication method based on an underground pipeline is characterized in that: the first step is as follows: acquiring pipeline mode electrical information of the speed of fluid in the pipeline, the liquid level of the fluid and the pressure intensity in the pipeline by a sensor group;

the second step is that: filtering, amplifying and digitally processing the signals of the first step by a first control unit;

the third step: packing the fluid speed, the fluid liquid level and the pressure inside the pipeline according to classification;

the fourth step: amplifying the power of the packed signal, driving an annular energy transducer, and exciting a transmitting acoustoelectric transducer to generate elastic guided waves on the inner wall of the pipeline;

the fifth step: receiving elastic guided waves of the inner wall of the pipeline sent by a sending end by an acoustic-electric transducer received by a strip-shaped transducer;

and a sixth step: wirelessly transmitting to the ground processor by the ground communication unit 2;

the seventh step: the ground processor unpacks the received information and displays the unpacked information on a terminal,

the method is characterized in that the speed of fluid in the pipeline, the liquid level of the fluid and the pressure in the pipeline are packed according to classification, the data are arranged according to byte sequence, and the number of bytes of the speed of the fluid in the pipeline, the liquid level of the fluid and the pressure in the pipeline respectively comprises check bits.

The invention has the advantages that:

the invention provides an underground pipeline which is formed by connecting multiple sections by using spiral joints or welding in a seamless mode, the optimal frequency range of elastic guided wave transmission of the inner wall of the pipeline is obtained through finite element modeling analysis, and analog or digital signals are loaded to a transducer through a signal conditioning and processing circuit. And transmitting and receiving the pipeline inner wall elastic guided wave in the frequency range, and conditioning the received pipeline inner wall elastic guided wave through a series of signals such as filtering, amplification and the like to realize pipeline underground wireless communication. After the wireless signal sending module modulates the piezoelectric signal and the like, the wireless signal sending module completes free space wireless signal transmission, the second control unit microcontroller receives the free space wireless signal, performs signal processing and demodulation processing, and sends pipeline information to the liquid crystal display for display, and finally, the underground pipeline is established in the full wireless underground pipeline communication network, wherein the underground pipeline is not based on wireless or wired communication of electromagnetic waves, but realizes wireless communication through elastic guided waves on the inner wall of the pipeline.

Drawings

The invention is further illustrated with reference to the accompanying drawings of embodiments:

FIG. 1 is a diagram of a wireless communication system based on elastic guided wave of underground pipelines;

FIG. 2 is a schematic diagram of a first control unit of the present invention

FIG. 3 is a schematic diagram of a second control unit of the present invention;

FIG. 4 is a schematic diagram of a wireless signaling module of the present invention;

fig. 5 is a signal loop flow diagram of the present invention.

In the figure, 1, underground communication unit; 2. an above-ground communication unit; 3. a first control unit; 4. an annular transducer; 5. a pipeline; 6. a strip transducer; 7. a wireless signal transmission unit; 8. an antenna; 9. a second control unit; 31. a sensor group; 32. a first control unit microcontroller; 71. a wireless transmission signal processor; 72. a wireless signal transmission power supply module; 73. a signal modulation unit; 74. a power output circuit; 321. A first unit power supply module; 322. a signal amplification circuit; 323. a signal filtering circuit; 324. a non-linear correction circuit; 325. a signal conversion circuit; 326. a first signal processing unit; 327. A band-pass filter; 328. a power amplifier circuit; 91. a second control unit microcontroller; 92. a display unit; 911. a second unit power module; 912. a second unit band-pass filter; 913. a second unit power amplifier; 914. signal demodulation; 915. an ADC conversion circuit; 916. a second control unit microcontroller.

Detailed Description

As shown in fig. 1, an elastic guided wave wireless communication system based on an underground pipeline is characterized in that: the system at least comprises an above-ground communication unit 2 and an underground communication unit 1;

the underground communication unit 1 comprises a first control unit 3, an annular transducer 4, a pipeline 5, a strip-shaped transducer 6, a wireless signal sending unit 7, a sensor group 31 and a first control unit microcontroller 32;

the above-ground communication unit 2 includes: a wireless signal transmission unit 7, an antenna 8, and a second control unit 9;

the first control unit microcontroller 32 acquires pipeline information to be transmitted by acquiring the sensor group 31, sends elastic guided waves to the inner wall of the pipeline 5 by controlling the annular transducer 4, converts electrical signal information of the first control unit microcontroller 32 into high-frequency pipeline radial vibration mechanical waves, and transmits the high-frequency pipeline radial vibration mechanical waves on the pipeline 5 in the form of elastic waves;

the bar-shaped transducer 6 array at the other end of the pipeline 5 is used as an acoustoelectric transducer for receiving elastic guided waves of the inner wall of the pipeline, and electric signals generated by the acoustoelectric transducer are wirelessly transmitted to a second control unit 9 by a wireless signal transmitting unit 7 and an antenna 8 for reading; the signal processing circuit and the demodulation link of the second control unit 9 realize wireless communication between the environment information and the internal information of the underground pipeline through the external antenna of the underground communication unit 1, and the microcontroller 91 of the second control unit displays the information on the liquid crystal screen display unit 92 to realize the full wireless network communication between the underground pipeline and the underground pipeline;

the annular transducer 4 is used as an acoustic-electric transducer for sending elastic guided waves of the inner wall of the pipeline, converts electric signal information of the first control unit 3 into high-frequency pipeline radial vibration mechanical waves and transmits the high-frequency pipeline radial vibration mechanical waves on the pipeline 5 in the form of elastic waves; the bar-shaped transducer 6 array is used as an acoustic transducer for receiving the elastic guided waves of the inner wall of the pipeline 5, and the acoustic transducer and the wireless signal sending module receive the elastic guided waves of the inner wall of the pipeline and convert the elastic guided waves into electric signals; finally, the underground pipeline environment information and the internal information are displayed on the liquid crystal screen through a signal processing circuit and a demodulation link of the second control unit 9, and full wireless ground and underground pipeline network communication is achieved.

As shown in fig. 2, a schematic diagram of the first control unit 3 is shown, where the first control unit 3 at least includes a sensor group 31, a first control unit microcontroller 32, a first unit power module 321, a signal amplification circuit 322, a signal filtering circuit 323, a non-linearity correction circuit 324, a signal conversion circuit 325, a first signal processing unit 326, a band-pass filter 327, and a power amplifier circuit 328; the sensor group 31, the first control unit microcontroller 32, the first unit power module 321, the signal amplifying circuit 322, the signal filtering circuit 323, the nonlinear correction circuit 324, the signal conversion circuit 325, the first signal processing unit 326, the band-pass filter 327, and the power amplifier circuit 328 are electrically connected in sequence; the information collected by the sensor group 31 passes through the signal amplifying circuit 322, the signal filtering circuit 323, the non-linear correction circuit 324 and the signal conversion circuit 325 which are electrically connected to the first signal processing unit 326, the first signal processing unit 326 demodulates the signal to convert various measured physical quantities of the sensor group 31 into a packed electric signal, the packed electric signal is converted into a certain frequency by the power amplifier circuit 328 and the band-pass filter 327, and the electric signal with a certain amplitude drives the annular transducer 4 to work. The power amplifier circuit 328 is used for amplifying the power required by the acoustoelectric transducer for conversion, and the power of the acoustoelectric transducer circuit is the power required by the acoustoelectric transducer for transmitting the elastic guided wave on the inner wall of the pipeline by using the annular transducer 4 from one end of the pipeline to the other end of the pipeline and the strip-shaped transducer 6 array for receiving the elastic guided wave on the inner wall of the pipeline.

As shown in fig. 3, giving an electrical schematic of the above ground communication unit 2, the above ground communication unit 2 comprises at least: an antenna 8, a second unit power module 911, a second unit band-pass filter 912, a second unit power amplifier 913, an ADC conversion circuit 915, a signal demodulation 914, a second control unit microcontroller 916 and a display unit 92; the second unit power module 911 supplies voltage required by the second unit band-pass filter 912, the second unit power amplifier 913, the signal demodulation 914, the ADC conversion circuit 915, the second control unit microcontroller 916 and the display unit 92, the antenna 8 filters the received wireless information through the second unit band-pass filter 912, amplifies the signal through the second unit power amplifier 913, demodulates the signal through the signal demodulation 914, converts the demodulated signal into a digital signal through the ADC conversion circuit 915, processes the digital signal through the second control unit microcontroller 916, and finally the display unit 92 displays the temperature and humidity of the environment where the underground pipeline is located, and the pipeline internal information such as the pipeline internal fluid speed, the fluid level and the pipeline internal pressure.

The band-pass filter removes noise waves, and effectively inhibits noise interference. The power amplifier amplifies the frequency band signal suitable for pipeline transmission, the ADC conversion chip transmits the digital signal to the processing chip for demodulation, decoding and other operations and transmits the digital signal to the display unit, and finally all data are displayed on the liquid crystal display.

As shown in fig. 4, a schematic diagram of a wireless signal transmission module is provided, the wireless signal transmission module at least includes a wireless signal transmission power module 72, a wireless transmission signal processor 71, a signal modulation unit 73 and a power output circuit 74, the frequency of the pipeline elastic guided wave transmission is generally a low-frequency signal, so that the wireless transmission signal processor 71 is required to modulate the signal to a frequency suitable for ground wireless communication through the signal modulation unit 73, and finally the power output circuit 74 drives the antenna 8 to perform wireless transmission.

As shown in fig. 5, a signal loop flow chart is given:

an elastic guided wave wireless communication method based on an underground pipeline is characterized in that: the method at least comprises the following steps:

the first step is as follows: acquiring pipeline mode electrical information with small data quantity such as the speed of fluid in the pipeline, the liquid level of the fluid, the pressure in the pipeline and the like by a sensor group;

the second step is that: filtering, amplifying and digitally processing the signals of the first step by a first control unit;

the third step: packing the fluid speed, the fluid liquid level and the pressure inside the pipeline according to classification; and packaging, namely data arranged according to a byte sequence, wherein the byte is occupied by the internal fluid speed, the fluid liquid level and the internal pressure of the pipeline respectively, and the data comprises check bits.

The fourth step: amplifying the power of the packed signal, driving an annular energy transducer, and exciting a transmitting acoustoelectric transducer to generate elastic guided waves on the inner wall of the pipeline;

the fifth step: receiving elastic guided waves of the inner wall of the pipeline sent by a sending end by an acoustic-electric transducer received by a strip-shaped transducer;

and a sixth step: wirelessly transmitting to the ground processor by the ground communication unit 2;

the seventh step: the ground processor unpacks the received information and displays the information on the terminal display.

The electric signal suitable for being transmitted on the pipeline is converted into a low-frequency signal with the frequency band of 20KHz-50KHz of the radial vibration mechanical wave of the pipeline.

The method is characterized in that the speed of fluid in the pipeline, the liquid level of the fluid and the pressure in the pipeline are packed according to classification, the data are arranged according to byte sequence, and the number of bytes of the speed of the fluid in the pipeline, the liquid level of the fluid and the pressure in the pipeline respectively comprises check bits.

In the invention, the wireless transmission information mainly comprises the temperature and humidity of the environment where the underground pipeline is located, the speed of fluid in the pipeline, the fluid level, the pressure in the pipeline and other pipeline information with small data volume, and the working condition of the pipeline can be judged through the information, and the transmitted pipeline information comprises the temperature and humidity information of the environment where the underground pipeline is located, the speed information of the fluid in the pipeline, the fluid level information and the pressure information in the pipeline; the transmitted pipeline information or the signals are amplified, filtered and subjected to nonlinear correction, the signals output by the sensor are converted into a required current or voltage form through a signal conversion link, and a band-pass filter is designed into a frequency band suitable for elastic wave transmission of the pipeline and filters out clutter in other frequency bands; the power amplifier amplifies the power required by the conversion work of the acoustoelectric transducer, the power is the acoustoelectric transducer which transmits information from one end of the pipeline to the other end of the pipeline and takes the annular transducer 4 as the elastic guided wave of the inner wall of the sending pipeline, the strip-shaped transducer 6 array is used as the required power of the acoustoelectric transducer which receives the elastic guided wave of the inner wall of the pipeline, the first control unit microcontroller excites the sending acoustoelectric transducer to generate the elastic guided wave of the inner wall of the pipeline, and the receiving acoustoelectric transducer receives the elastic guided wave of the inner wall of the pipeline sent by the sending end. The wireless signal sending module is connected with the receiving acoustoelectric transducer, receives the electric signal converted by the receiving acoustoelectric transducer, modulates the electric signal into a signal with a certain frequency, and transmits the signal to the second control unit microcontroller through the antenna.

The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.