CN113154268B - Wireless passive damage leakage monitoring system and control method thereof - Google Patents
Wireless passive damage leakage monitoring system and control method thereof Download PDFInfo
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- CN113154268B CN113154268B CN202110293500.9A CN202110293500A CN113154268B CN 113154268 B CN113154268 B CN 113154268B CN 202110293500 A CN202110293500 A CN 202110293500A CN 113154268 B CN113154268 B CN 113154268B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The application discloses wireless passive damage leakage monitoring system and control method thereof, the system includes: the system comprises a passive flexible piezoelectric sensing and wireless radio frequency transmitting module, a wireless radio frequency dynamic reading module and a field processing display module; the passive flexible piezoelectric sensing and wireless radio frequency transmitting module acquires sound wave signals generated after the damage of the monitoring target, and the sound wave signals are written into the passive tag through the conditioning circuit when power is supplied to the outside of the wireless radio frequency dynamic reading module; the wireless radio frequency dynamic reading module supplies power to the passive flexible piezoelectric sensing and wireless radio frequency transmitting module when reading and scanning are carried out, and transmits the passive flexible piezoelectric sensing and wireless radio frequency transmitting module to the field processing display module; the on-site processing display module collects information from the wireless radio frequency dynamic reading module, analyzes and processes the information according to a related pipeline damage leakage calculation model algorithm contained in the module, and judges the pipeline damage state. The problem of nondestructive on-demand inspection and intelligent judgment of pressure vessel pipeline damage leakage under complex environments such as buried pipelines is solved.
Description
Technical Field
The invention relates to the technical field of pipeline damage detection, in particular to a wireless passive damage leakage monitoring system and a control method thereof.
Background
At present, pipeline transportation is parallel to roads, railways, water transportation and shipping, and becomes five transportation industries, and accidents and losses caused by pipeline damage are serious each year, so that the pipeline damage is detected more conveniently and effectively in order to maintain the pipeline damage in time, and the pipeline damage is a key problem.
At present, for monitoring pipeline damage, the following methods are mainly available:
(1) The traditional method comprises the following steps: the traditional method comprises a U-shaped pipe pressure meter method, a pipeline pressure test method, a water soaking method and the like, wherein the U-shaped pipe pressure meter method is used for judging the air tightness of a pipeline by inflating the pipeline and checking the liquid level change of the U-shaped pipe pressure meter within a certain time range; the pipeline pressure test method is characterized in that pressure records are carried out during the test by a conventional pressure gauge, and the air tightness of the pipeline is determined according to the whole pressure drop; the water soaking method is to soak the pipeline in water, observe whether the pipeline has water inflow or air bubbles leak, and judge the air tightness of the pipeline. The traditional monitoring method is simple in method and principle, but most of the traditional monitoring methods are judged by means of manual reading records and human eyes, have great human errors, depend on subjective judgment of people, lack in rigor and low in efficiency.
(2) Modern pressure monitoring methods: modern pressure monitoring methods are generally an entire system, and can be classified into direct pressure testing methods, ultrasonic testing methods, and the like according to the detection principle. The direct pressure test method uses a singlechip as a control core, and uses the direct pressure test method as a principle to automatically complete operations such as inflation, pressure stabilization, pressure maintaining detection, analysis, alarm and the like and complete the judgment of the air tightness of the pipeline. The method has good detection repeatability and high detection precision, overcomes the defects of large human error, complex operation and easy occupational hazard of the traditional method, but has no real-time monitoring function and can not detect the pipeline in use. The ultrasonic detection method is to install the pressure sensor on the surface of the pipeline, send out ultrasonic wave to excite through the computer, transmit to the pressure sensor through signal amplification and other treatments, the generated vibration propagates along the pipeline, and can be reflected back when encountering damage, then the pressure sensor receives the signal, and transmits to the computer or oscilloscope, and the defect and the position thereof are determined through analysis. The method can be directly applied to pipelines in use, and the air tightness of the pipelines is monitored at any time, but the wired method has the limitation of being aimed at pipelines with complex structures or buried underground.
The prior art has made many researches in the aspect of pipeline damage monitoring, the system also tends to be perfect, but the system is mainly innovations in the aspect of signal processing, and the system is difficult to effectively monitor aiming at the acquisition of signals in an externally-applied excitation and wired acquisition mode, such as corrosion leakage monitoring of underground pipelines, pipelines under heat insulation layers and buried oil and gas pipelines.
Disclosure of Invention
In order to solve the defects of the existing system in terms of corrosion leakage monitoring and improve real-time performance and high efficiency of buried pipeline damage monitoring, the invention provides a wireless passive damage leakage monitoring system and a control method thereof. The system fully utilizes the flexible piezoelectric film and the radio frequency identification principle, and combines the related method of signal processing to construct a wireless passive flexible damage leakage monitoring system; the method for detecting the damage state of the pipeline and judging the damage position is obtained, and a system structure for wirelessly reading the damage information of the pipeline state is established; the sound wave vibration rule caused by the damage of the pipeline is disclosed.
In order to achieve the purpose, the invention adopts the technical means that:
a wireless passive damage leakage monitoring system, comprising: the system comprises a passive flexible piezoelectric sensing and wireless radio frequency transmitting module, a wireless radio frequency dynamic reading module and a field processing display module;
the passive flexible piezoelectric sensing and wireless radio frequency transmitting module comprises a flexible acoustic wave sensor and a passive tag, and is used for collecting acoustic wave signals generated after the damage of a monitoring target, converting the acoustic wave signals into voltage signals through the flexible acoustic wave sensor, and writing the voltage signals into the passive tag through a conditioning circuit when power is supplied to the outside of the wireless radio frequency dynamic reading module;
the wireless radio frequency dynamic reading module is used for supplying power to the passive flexible piezoelectric sensing and wireless radio frequency transmitting module when reading and scanning are carried out, reading passive tag signals through an antenna and transmitting the passive tag signals to the field processing display module;
the on-site processing display module is used for collecting information from the wireless radio frequency dynamic reading module, analyzing and processing according to a related pipeline damage leakage calculation model algorithm contained in the module, and judging the pipeline damage state.
As a further improvement of the invention, the flexible acoustic wave sensor is stuck on the pipeline through the viscous medium to convert an acoustic wave signal generated by damage of the pipeline into a voltage signal.
As a further improvement of the invention, the flexible acoustic wave sensor is a high-molecular flexible piezoelectric film, electrodes are prepared by screen printing or vacuum sputtering, a radio frequency emission circuit is printed while the electrodes are printed, and a passive tag is implanted into the high-molecular flexible piezoelectric film.
As a further development of the invention, the passive tag transmits a signal via a transmitting antenna when read by an external reader.
As a further improvement of the invention, the wireless radio frequency dynamic reading module comprises a reader, a receiving antenna and a power supply;
the reader is used for reading and erasing data in the passive tag by sending intermittent continuous radio frequency signals;
the receiving antenna is used for transmitting radio frequency signals between the passive tag and the reader;
the power supply is used for supplying power to the wireless radio frequency dynamic reading module.
As a further improvement of the invention, the on-site processing display module comprises an acoustic signal display interface, a signal demodulation and processing module and a damage information display interface;
the sound wave signal display interface is used for displaying signals which are modulated and transmitted after being generated by the flexible sound wave sensor;
the signal demodulation and processing module is used for processing the received signals and judging the damage and leakage state of the pipeline;
the damage information display interface is used for displaying the discrimination result.
As a further improvement of the invention, the signal demodulation and processing module comprises a radio frequency signal demodulation unit, an acoustic wave signal recovery unit and a defect identification unit, the on-site processing display module receives signals from the reader, the radio frequency signal demodulation unit is used for separating damage signals carried by carriers, the acoustic wave signal recovery unit is used for recovering acoustic wave signal characteristics caused by damage leakage, and the defect identification unit is used for judging damage failure states.
As a further improvement of the invention, the discrimination result includes a display of the presence or absence of damage to the pipeline, the magnitude of the damage degree, and the position coordinates of the damage.
As a further improvement of the invention, a remote information center is also included,
the remote information center is used for cooperatively controlling the passive flexible piezoelectric sensing and wireless radio frequency transmitting module, the wireless radio frequency dynamic reading module and the on-site processing display module, and storing and managing the results obtained by analysis processing.
A control method of a wireless passive damage leakage monitoring system, comprising the steps of:
the flexible acoustic wave sensor collects acoustic wave signals sent by a monitoring target, and the acoustic wave signals are stored in the passive tag through the conditioning circuit when the wireless radio frequency dynamic reading module is powered in a wireless mode;
the wireless radio frequency dynamic reading module collects signals stored in the passive tag, and intermittently reads out a section of sound wave signal sequence; transmitting the acquired sound wave signals to a field processing display module;
the on-site processing display module is used for qualitatively judging the damage state of the pipeline through signal processing and analysis, positioning the damage position through signals and quantitatively analyzing the damage size of the pipeline.
Compared with the prior art, the invention has the advantages that:
the invention discloses a wireless passive damage leakage monitoring system based on a flexible piezoelectric film, which structurally adopts an integrated design of a flexible piezoelectric sensor and a flexible circuit, wherein the flexible piezoelectric sensor is used as an embedded wireless detection terminal for subsequent reading; the wireless signal transmission device can be applied to the field of pipeline detection in which a wired signal transmission signal cannot be used, wireless reading is realized by utilizing an RFID system, acoustic signals are stored and read by utilizing a radio frequency emission mode through a tag, a reader and an antenna, and the signals are read by utilizing an external reader terminal, so that the wireless real-time detection is realized, and the passive wireless transmission of the signals is realized; the purposes of dynamic real-time monitoring, life prediction, risk treatment and the like of the operation of the buried pipeline are realized.
Further, the flexible piezoelectric sensor can be embedded, can be well wound or stuck on a pipeline, has larger contact area with the pipeline, and can be directly printed with a corresponding radio frequency emission circuit or stuck with a flexible printed circuit on the through surface of the high polymer flexible piezoelectric film, thereby being used as an embedded wireless detection terminal for subsequent reading.
Further, in judging damage leakage, adopting an acoustic signal demodulation recovery and positioning algorithm to separate a wireless received signal into a detection acoustic signal, and then recovering according to sampling frequency and the like, so that the acoustic signal generated by damage leakage is extracted, and judging the damage state and positioning the leakage position by utilizing a signal processing and analysis algorithm; finally, a wireless structure damage monitoring system based on a flexible piezoelectric film is constructed, and an accurate identification and leakage positioning method for buried pipeline damage monitoring and fluid leakage is obtained; the problems of pipeline damage judgment and leakage positioning of the buried pipeline in actual use are solved, and a dynamic risk evaluation mechanism for the buried pipeline is further constructed, so that the purposes of dynamic real-time monitoring, life prediction, risk treatment and the like of the operation of the buried pipeline are realized.
The method has the specific advantages that:
(1) The invention integrates a high polymer flexible piezoelectric film, an RFID technology and a signal processing algorithm to judge the damage and leakage of the pipeline, has high identification precision, wide range and accurate result, can realize the damage and leakage detection of the pressure container pipeline, particularly the real-time monitoring of the buried pipeline, and solves the problems of difficult real-time damage monitoring and positioning of the deep buried pipeline.
(2) And the damage leakage condition of the pipeline is estimated according to the real-time monitoring result of the system, the transmitted radio frequency signal is demodulated and recovered by using a calculation model algorithm of the damage leakage signal, intelligent identification and positioning are realized by referring to parameters such as the propagation speed of sound waves according to an analysis and positioning algorithm, and then a reasonable repair plan can be formulated according to the intelligent identification and positioning, so that a large amount of loss and environmental pollution caused by damage leakage of the pipeline are avoided.
(3) The invention has wide application range, can be applied to a plurality of industries requiring container pipeline transportation such as chemical industry, photoelectric industry, traditional manufacturing industry and the like, particularly carries out risk assessment, life prediction and risk disposal aiming at damage judgment and leakage monitoring of deep buried pipelines, has wide application prospect and has very strong popularization value.
Drawings
FIG. 1 is a diagram of a study scheme of the present invention; wherein, 1 is a passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1;2 is a wireless radio frequency dynamic reading module 2;3 is a field processing display module 3;4 is a telematics center 4.
FIG. 2 is a schematic diagram of a wireless reading architecture of the present invention;
FIG. 3 is a flow chart of the monitoring system of the present invention;
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention will now be described in further detail with reference to the specific examples and the accompanying drawings, which are given by way of illustration and not limitation.
The invention discloses a wireless passive damage leakage monitoring system based on a flexible piezoelectric film, which consists of a passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1, a wireless radio frequency dynamic reading module 2, a remote information center 4 and a field processing display module 3.
The passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1 is wound on a pipeline through a polymer flexible piezoelectric film, and generates a voltage signal through sensing sound wave vibration generated by pipeline leakage, and an electric signal generated by the sound wave sensor 100 is transmitted through the conditioning circuit 103 and stored in the passive tag 101 through a radio frequency circuit for subsequent reading.
The wireless radio frequency dynamic reading module 2 is used for scanning the passive tag 101 at any time by utilizing an external terminal when needed by means of an antenna and a radio frequency circuit, and supplying power to the passive tag through the radio frequency circuit, so that the passive tag receives a signal from the sound wave acquisition module and transmits the signal to the external reader 200 terminal, thereby realizing wireless transmission of a pipeline leakage sound wave signal, and then the acquired data can be analyzed and processed by the on-site processing display module 3 to judge the damage condition of the pipeline; then, the on-site processing display module 3 performs corresponding analysis processing on the acoustic signals to obtain relevant information of the pipeline damage, judges the damage state, the damage degree and the damage position of the pipeline, and then the remote information center 4 stores the obtained results and provides corresponding optimization suggestions for subsequent decision-making and timely policy making and pipeline maintenance by maintenance staff.
Because the polymer flexible piezoelectric film can be used for detecting some acoustic signals generated by crack growth or leakage, and because the polymer flexible piezoelectric film is a flexible film, the polymer flexible piezoelectric film can be stuck on the surface of a pipeline or a structure by using viscous medium. When the pipeline is damaged, gas leaks, and the high-molecular flexible piezoelectric film senses sound waves to generate voltage signals, the voltage signals are generally printed by silk screen and vacuum sputtered to prepare electrodes. If the principle of flexible circuit board FPC is combined, when the electrode is printed, the radio frequency transmitting circuit is printed, then the radio frequency transmitting circuit can be used as an embedded wireless detection terminal, just like a radio frequency card, the radio frequency transmitting circuit is buried in a complex structure, when signals need to be detected, the information can be obtained by scanning by utilizing an outer terminal, wireless detection at any time is realized, and the radio frequency transmitting circuit has a certain value for monitoring corrosion and leakage of underground pipelines and pipelines under an insulating layer. The damage monitoring system with the wireless structure can be applied to damage leakage monitoring of various container pipelines, including corrosion damage, crack damage and the like, and particularly can acquire information through wireless scanning of an external terminal aiming at underground pipeline damage with a complex structure.
The remote information center 4 is used for storing data information and starting to execute a pipeline damage leakage monitoring and judging task;
the passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1 is used for collecting sound wave signals generated after damage of a monitoring target, converting the sound wave signals into voltage signals through a high polymer flexible piezoelectric film, and transmitting the voltage signals into the passive tag 101 by means of circuit conditioning for subsequent signal transmission and analysis; the passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1 comprises a flexible acoustic wave sensor 100, a passive tag 101, a transmitting antenna 102 and a conditioning circuit 103. The flexible acoustic wave sensor 100 is adhered to a pipeline by means of a polymer flexible piezoelectric film through an adhesive medium, converts an acoustic wave signal generated by pipeline damage into a voltage signal, and has a flexible embeddable characteristic. The passive tag 101 is responsible for storing the voltage signal generated by the flexible acoustic wave sensor 100 and transmitting the signal out when the external reader 200 reads the signal, and the transmitting antenna 102 is responsible for transmitting the radio frequency signal between the tag and the reader 200, and the guided wave energy and the radio wave from the transmitter are mutually converted and the radio frequency signal is transmitted out. The conditioning circuit 103 is responsible for conditioning and transmitting the voltage signal generated by the flexible acoustic wave sensor 100, so as to facilitate the storage of the passive tag 101.
The wireless radio frequency dynamic reading module 2 is used for supplying power to the passive flexible damage leakage sensing module when reading and scanning are carried out, reading wireless tag signals through an antenna and sending the wireless tag signals to the field processing display module 3; the wireless radio frequency dynamic reading module 2 consists of a reader 200, a receiving antenna 201 and a power supply 202. The reader 200 reads and erases the data in the passive tag 101 by sending out intermittent continuous radio frequency signals, and reads out a section of sound wave signals so as to facilitate the subsequent processing of the field processing display module 3. The receiving antenna 201 is responsible for transmitting radio frequency signals between the tag and the reader/writer, converting guided wave energy and radio waves from the transmitter into each other, and receiving the transmitted radio frequency signals. The power supply 202 is responsible for supplying power to the wireless radio frequency dynamic reading module 2, so as to realize on-site rapid reading of signals.
The on-site processing display module 3 is used for judging the damage state of the pipeline, collecting the information from the wireless radio frequency dynamic reading module 2, analyzing and processing the information and communicating with the module; and analyzing and converting the acquired acoustic wave signals by utilizing a related pipeline damage leakage calculation model algorithm, judging the damage state of the pipeline, obtaining the position of the pipeline damage, and displaying the position.
The on-site processing display module 3 comprises an acoustic signal display interface 300, a damage information display interface 302 and a signal demodulation and processing module 301; the acoustic signal display interface 300 displays signals modulated and transmitted after the polymer flexible piezoelectric film is generated. The damage information display interface 302 displays the discrimination result obtained by the self-model algorithm, and displays whether damage occurs to the pipeline, the damage degree and the position coordinates of the damage. The signal demodulation and processing module 301 establishes a corresponding model according to a radio frequency signal demodulation algorithm, a sound wave signal recovery algorithm and a defect identification algorithm, processes the received signals, and judges the damage and leakage state of the pipeline.
The remote information center 4 is used for storing the corresponding processing analysis data result, evaluating the risk of the pipeline defect, providing a maintenance optimization strategy and cooperating with the work of each module.
The application relates to a wireless passive pressure vessel pipeline and structure damage leakage monitoring system based on a flexible piezoelectric film. The flexible piezoelectric film and the RFID system are utilized, the wireless structure damage monitoring system based on the flexible piezoelectric film is constructed based on the active acoustic wave and wireless communication principle and combined with a signal processing related algorithm, the damage and leakage of the pipeline are monitored in real time, the accurate judgment is carried out on the damage and leakage of the pipeline, the accurate identification and positioning tracking of the damage and leakage of the pressure pipeline container are obtained, and the problems of nondestructive on-demand inspection and intelligent judgment of the damage and leakage of the pressure pipeline container in complex environments such as buried pipelines are solved.
A control method of a wireless passive damage leakage monitoring system based on a flexible piezoelectric film comprises the following steps:
the method comprises the steps that sound wave signals sent by a monitoring target are collected, and when the reader 200 is powered in a wireless mode, the sound wave signals are stored in the passive tag 101 through a radio frequency circuit printed when the piezoelectric film is prepared;
the reader 200 supplies power to the wireless passive sensing module in a wireless power supply mode, collects the sound wave signals stored in the passive tag 101, and intermittently reads out a section of sound wave signal sequence;
the acquired sound wave signals are transmitted to a field processing display module 3 to be subjected to signal processing and analysis through a model algorithm, the damage state of the pipeline is qualitatively judged, the damage position is positioned through the signals, and the damage size of the pipeline is quantitatively analyzed. The qualitative, quantitative and positioning of the damage state of the pipeline are realized; and then the on-site processing display module 3 displays the analysis and processing results of the signals and the remote information center 4, so that the on-site processing and displaying module is convenient for people to visually observe and process in time.
The remote information center 4 stores the data information obtained by processing, cooperatively controls the execution of each module, predicts risk, and carries out suggestion optimization on a subsequent maintenance strategy.
A wireless passive damage leakage monitoring system based on a flexible piezoelectric film comprises the following manufacturing and installation processes:
the flexible device can be embedded, a high polymer flexible piezoelectric film is used, the device can be well wound or adhered to a pipeline, the contact area between the device and the pipeline is larger, and a corresponding radio frequency transmitting circuit is directly printed on the through surface of the high polymer flexible piezoelectric film or is adhered to the flexible printed circuit, so that the device is used as an embedded wireless detection terminal for reading by the reader 200;
the specific signal transmission process comprises the following steps:
the passive tag 101 supplies power to the passive tag 101 by using the radio frequency signal sent by the reader 200, and reads the signal of the passive tag 101 at each moment in a period of time by continuously and intermittently sending the radio frequency signal to form a period of time sequence, so that the subsequent processing of the remote information center 4 is convenient, the power supply 202 is not needed, and the method is suitable for real-time damage monitoring in complex environments such as buried pipelines;
the wireless reading is realized by using the RFID system, the sound wave signals are stored and read by using a radio frequency emission mode through a tag, a reader-writer and an antenna, and the sound wave signals are read by using the external reader 200 terminal, so that the wireless real-time detection is realized conveniently and rapidly.
The following detailed description of the invention refers to the accompanying drawings:
as shown in fig. 1, the present invention is mainly composed of four parts: the system comprises a passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1, a wireless radio frequency dynamic reading module 2, a field processing display module 3 and a remote information center 4.
The main functions of each part are as follows: the passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1 is responsible for sensing acoustic wave signals generated by pipeline damage leakage, generating corresponding voltage signals and storing the voltage signals in the passive tag 101 through the conditioning circuit 103; the wireless radio frequency dynamic reading module 2 is responsible for supplying power to the passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1, and transmitting signals in a wireless mode through the passive tag 101 and the external reader 200 terminal; the on-site processing display module 3 is responsible for processing and calculating the sound wave signals to obtain corresponding results and displaying the sound wave signals and the processed results, so that visual observation is facilitated; the remote information center 4 is responsible for integrating and storing data and carrying out risk assessment and policy optimization.
As shown in fig. 2, the implantable wireless architecture system of the present invention is based on the following principle:
the polymer flexible piezoelectric film can be used for detecting some acoustic signals generated by crack growth or leakage, and can be attached to the surface of a pipeline or a structure because the polymer flexible piezoelectric film is a flexible film. When the pipeline is damaged, gas leaks, and the high-molecular flexible piezoelectric film senses sound waves and generates voltage signals, the high-molecular flexible piezoelectric film is generally prepared into an electrode by screen printing and vacuum sputtering. When the high polymer flexible piezoelectric film is prepared, the principle of flexible circuit board FPC is combined, and the radio frequency emission circuit is printed while the electrode is printed, so that the passive tag 101 is implanted into the piezoelectric film to serve as an embedded wireless detection terminal, when the electric signal in the piezoelectric film needs to be read, electromagnetic waves are emitted through the terminal of the external reader 200, induced current is generated in the radio frequency circuit, and thus the passive tag 101 is supplied with energy to send out the electric signal stored in the radio frequency circuit, wireless detection is achieved, and an implantable wireless structure is formed.
As shown in fig. 3, the general flow of the operation of the detection system of the present invention is:
when the pipeline is damaged, gas in the pipeline can leak to generate sound wave vibration, and at the moment, the passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1 can acquire corresponding sound wave signals: the contact between the high-molecular flexible piezoelectric film and the pipe wall enables the high-molecular flexible piezoelectric film to feel the fine vibration of the pipe wall, so that a voltage signal is generated inside the high-molecular flexible piezoelectric film, the voltage signal is led out and stored in the passive tag 101 through the conditioning circuit 103 added during the preparation of the high-molecular flexible piezoelectric film, the passive tag 101 is implanted into the high-molecular flexible piezoelectric film, and therefore, when the external reader 200 terminal scans, power is supplied through the radio frequency circuit, and the sound wave signal generated by the high-molecular flexible piezoelectric film is read out, so that wireless transmission of the signal is realized; the wireless radio frequency dynamic reading module 2 supplies power to the passive flexible piezoelectric sensing and wireless radio frequency transmitting module 1, and receives and transmits voltage signals to the field processing display module 3; the on-site processing display module 3 processes the received acoustic wave signal: firstly, demodulating radio frequency signals, separating signals sent by a wireless antenna into carrier waves and detection sound wave signals, then recovering the sound wave signals, recovering the sound wave signals according to the separated signals and sampling sequences, finally identifying damage failure, completing the qualitative determination of damage states through signal processing and analysis algorithms, judging whether damage occurs to a pipeline or not, quantifying the damage states, judging the damage degree of the pipeline and the positioning of the damage states, judging the damage position of the pipeline, and displaying the analysis processing results of a built-in model algorithm; the telematics center 4 then integrates and stores the data for risk assessment and policy optimization.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
The above examples are provided for illustrating the technical aspects of the present invention and are not limited thereto, and although the present invention has been described in detail with reference to the above examples, one skilled in the art may make modifications and equivalents to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, any modifications and equivalents thereof are within the scope of the appended claims.
Claims (3)
1. A method for controlling a wireless passive damage leakage monitoring system, the system comprising: the system comprises a passive flexible piezoelectric sensing and wireless radio frequency transmitting module (1), a wireless radio frequency dynamic reading module (2), a field processing display module (3) and a remote information center (4);
the passive flexible piezoelectric sensing and wireless radio frequency transmitting module (1) comprises a flexible acoustic wave sensor (100) and a passive tag (101) and is used for collecting acoustic wave signals generated after the damage of a monitoring target, and then the acoustic wave signals are converted into voltage signals through the flexible acoustic wave sensor (100), and when power is supplied through the outside of the wireless radio frequency dynamic reading module (2), the voltage signals are written into the passive tag (101) through a conditioning circuit (103);
the wireless radio frequency dynamic reading module (2) is used for supplying power to the passive flexible piezoelectric sensing and wireless radio frequency transmitting module (1) when reading and scanning is carried out, reading a signal of the passive tag (101) through an antenna and transmitting the signal to the field processing display module (3);
the on-site processing display module (3) is used for collecting information from the wireless radio frequency dynamic reading module (2) and analyzing and processing according to a related pipeline damage leakage calculation model algorithm contained in the module, and judging the pipeline damage state;
the flexible acoustic wave sensor (100) is stuck on a pipeline through viscous medium, and converts an acoustic wave vibration signal generated by pipeline damage into a voltage signal;
the flexible acoustic wave sensor (100) is a high-molecular flexible piezoelectric film, electrodes are prepared by screen printing or vacuum sputtering of the high-molecular flexible piezoelectric film, a radio frequency emission circuit is printed while the electrodes are printed, and a passive tag (101) is implanted into the high-molecular flexible piezoelectric film; the high polymer flexible piezoelectric film is wound or stuck on the pipeline;
the passive tag (101) transmits signals out through the transmitting antenna (102) when being read by an external reader (200); the radio frequency signal sent by the reader (200) supplies power to the passive tag (101), and the radio frequency signal is continuously sent out to read out the signal of the passive tag (101) at each moment in a period of time to form a period of time sequence, and the period of time sequence is processed by the remote information center (4);
the wireless radio frequency dynamic reading module (2) comprises a reader (200), a receiving antenna (201) and a power supply (202);
the reader (200) is used for reading and erasing data in the passive tag (101) by sending intermittent continuous radio frequency signals;
the receiving antenna (201) is used for transmitting radio frequency signals between the passive tag (101) and the reader (200);
the power supply (202) is used for supplying power to the wireless radio frequency dynamic reading module (2);
the on-site processing display module (3) comprises an acoustic signal display interface (300), a signal demodulation and processing module (301) and a damage information display interface (302);
the sound wave signal display interface (300) is used for displaying signals which are modulated and transmitted after the flexible sound wave sensor (100) is generated;
the signal demodulation and processing module (301) is used for processing the received signals and judging the damage and leakage state of the pipeline; the signal demodulation and processing module (301) establishes a corresponding model according to a radio frequency signal demodulation algorithm, a sound wave signal recovery algorithm and a defect identification algorithm, processes a received signal and judges the damage and leakage state of the pipeline; the signal demodulation and processing module (301) comprises a radio frequency signal demodulation unit, an acoustic wave signal recovery unit and a defect identification unit, the on-site processing display module (3) receives signals from the reader (200), the radio frequency signal demodulation unit is used for separating damage signals carried by carriers, the acoustic wave signal recovery unit is used for recovering acoustic wave signal characteristics caused by damage leakage, and the defect identification unit is used for judging damage failure states;
the damage information display interface (302) is used for displaying the discrimination result;
the method comprises the following steps:
the flexible acoustic wave sensor (100) collects acoustic wave signals sent by a monitoring target, and the acoustic wave signals are stored in the passive tag (101) through the conditioning circuit (103) when the wireless radio frequency dynamic reading module (2) is powered in a wireless mode;
the wireless radio frequency dynamic reading module (2) collects signals stored in the passive tag (101) and intermittently reads out a section of sound wave signal sequence; transmitting the acquired sound wave signals to a field processing display module (3);
the on-site processing display module (3) is used for qualitatively judging the damage state of the pipeline through signal processing and analysis, positioning the damage position through signals and quantitatively analyzing the damage size of the pipeline.
2. The method for controlling a wireless passive damage leakage monitoring system according to claim 1, wherein the discrimination result includes a display of whether damage occurs to the pipeline, a magnitude of damage degree, and a position coordinate of the damage.
3. A control method of a wireless passive damage leakage monitoring system according to claim 1,
the remote information center (4) is used for cooperatively controlling the passive flexible piezoelectric sensing and wireless radio frequency transmitting module (1), the wireless radio frequency dynamic reading module (2) and the on-site processing display module (3) and storing and managing the result obtained by analysis processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110293500.9A CN113154268B (en) | 2021-03-18 | 2021-03-18 | Wireless passive damage leakage monitoring system and control method thereof |
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