CN111457257B - Detection method and system for positioning leakage position of pipeline - Google Patents
Detection method and system for positioning leakage position of pipeline Download PDFInfo
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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
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Abstract
The invention discloses a detection method and a detection system for positioning a leakage position of a pipeline, wherein a first sound wave transducer and a second sound wave transducer are arranged and respectively arranged at different positions of the pipeline; the first sound wave transducer and the second sound wave transducer can receive leakage sound waves caused when the pipeline leaks, the first sound wave transducer and the second sound wave transducer can mutually excite and receive excitation sound waves used for positioning the leakage position, the leakage sound waves and the excitation sound waves have different sound wave characteristics, and the leakage position is obtained through calculation according to the distance between the first sound wave transducer and the second sound wave transducer and the propagation time of the leakage sound waves and the excitation sound waves. The measuring method adopted by the technical scheme of the invention does not need prior knowledge of sound velocity and flow velocity, is more convenient to measure, simultaneously avoids measuring errors caused by different propagation speeds of sound waves in different environments, and improves the measuring accuracy.
Description
Technical Field
The invention relates to the technical field of pipeline leakage detection, in particular to a detection method and a detection system for positioning a pipeline leakage position.
Background
The pipeline leakage exists in the industrial process in a large amount and brings hidden troubles to industrial production. Pipe leaks can be an artifact or caused by other factors, for example, sudden changes in pressure in the pipe, corrosion of the pipe by fluids, impact of foreign objects on the pipe, defects in the pipe material itself, lack of maintenance on the pipe, etc., can cause pipe leaks to occur. In most cases, leakage can have deleterious consequences or even cause serious problems. The leakage of the natural gas pipeline not only brings about the leakage of a large amount of gas, but also brings about property loss and casualties due to the fact that sound leakage and explosion are generated in severe cases. In the aerospace liquid propulsion system, the transmission of the propellant is borne by pipelines, and pipeline leakage not only influences the transmission, but also causes unstable work of the engine. In severe cases, explosion and other dangers occur, so that the method has great significance for detecting and positioning leakage of the pipeline system.
The method for detecting pipelines is various and mainly comprises in-pipeline detection and out-of-pipeline detection. Fig. 1 summarizes the current approach. Specifically, the in-pipe detection method comprises a tracer leak detection method and an in-pipe sphere detection method. The methods for detecting outside of tubes are classified into direct and indirect methods. The direct measurement method mainly comprises a manual inspection method, a detection element method, a gas detection method and an airborne infrared method. While indirect measurements include signal-based methods, model-based methods, knowledge-based methods. The signal-based method comprises a pressure gradient method, a negative pressure wave method, a pressure point analysis method, a flow balance method and an acoustic method. The model-based method comprises a state observation method, a system identification method, Kalman filtering, a real-time model method and a transient flow detection method. Knowledge-based methods include statistical analysis, neural network methods, and pattern recognition methods.
For a space propulsion system, due to the particularity of the propellant, an external indirect measurement mode is required for leakage detection, so that additional influence on propulsion and a pipeline structure is not generated. For leak detection, the determination may be made by methods such as state observation, flow balance, and the like. However, for leak location, methods such as condition observation and flow balance have great difficulty. Positioning by using an acoustic signal generated by leakage is widely regarded, and a large number of researchers develop positioning research on industrial leakage of a gas pipeline, a water supply pipeline and the like by using an acoustic method.
In the leakage positioning technology based on the acoustic method, a plurality of acoustic wave transducers are required to be installed in a pipeline for detecting leakage signals (the frequency of the leakage signals of the industrial pipeline is mainly distributed in a low frequency band), a leakage source is preliminarily determined by using detection data, and then the leakage source is accurately positioned according to the acoustic wave transducers near the leakage source, as shown in fig. 2.
In fig. 2, let the leakage source be x from the acoustic transducer 1 and the two acoustic transducers be L apart. The flow field in the pipeline is assumed to be a uniform flow field, and the flow rate is
Further, the propagation velocity of the acoustic wave in the stationary fluid is c. The sound wave generated by the leakage source is transmitted to the sound wave transducer 1 and the sound wave transducer 2 simultaneously, and the corresponding leakage transmission time is respectively
By simple mathematical derivation, the following can be obtained
When the flow rate is satisfied
The above formula can be simplified to
In the above method, Δ tpeak＝tpeak--tpeak+Methods such as cross-correlation may be used to solve. As can be seen from the above formula, in the method of the prior art, the propagation speed c of the acoustic wave in the stationary fluid needs to be set in advance. However, for complex environments, the acoustic wave propagation speed is difficult to set in advance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a detection method and a detection system for locating the leakage position of a pipeline.
The speed of sound wave propagation in a liquid is affected by factors such as fluid pressure, temperature, composition, etc. The complex environmental change of the propulsion pipeline of the spacecraft in the in-orbit operation changes the sound wave propagation speed, and the error is caused by setting the sound wave propagation speed in advance. The invention mainly solves the technical problems of real-time sound velocity measurement and measurement accuracy.
The measurement principle of the invention is as follows:
in view of the fact that the acoustic wave transducer can not only receive acoustic waves, but also emit acoustic waves. At the time difference Δ t of detecting the occurrence of leakagepeakBased on that the sound wave can be transmitted by the sound wave transducer 1, the sound wave can be received by the sound wave transducer 2, and the corresponding time can be expressed as
Similarly, when the acoustic wave transducer 2 emits an acoustic wave and the acoustic wave transducer 1 receives the acoustic wave, the corresponding time can be expressed as
It should be noted that, since the sound wave caused by the leakage in the pipeline still propagates, the sound wave characteristics emitted by the sound wave transducer are different from those caused by the leakage, so that the actively emitted sound wave and the leaked sound wave can be effectively separated.
The product of equation (4) and (5) can be obtained
It should be noted that the basis for the above equation to be approximately established is
The assumption is that
The second order fractional amount of (c) is theoretically advantageous. Equation (2) can be rewritten as
Substituting the formulas (4) to (6) into the above formula
Compared with the measurement method (3) in the background art, the formula adopted by the invention does not need the prior knowledge of the sound velocity and the flow velocity, and only needs to determine the installation distance of the two transducers, and the distance can be determined during installation.
In order to solve the above mentioned technical problems, based on the above mentioned measurement principle, the present invention specifically adopts the following technical solutions:
the invention has the technical scheme that the detection method for positioning the leakage position of the pipeline is characterized in that a first sound wave transducer and a second sound wave transducer are arranged and respectively arranged at different positions of the pipeline; the first sound wave transducer and the second sound wave transducer can receive leakage sound waves caused when the pipeline leaks, the first sound wave transducer and the second sound wave transducer can mutually excite and receive excitation sound waves used for positioning the leakage position, the leakage sound waves and the excitation sound waves have different sound wave characteristics, and the leakage position is obtained through calculation according to the distance between the first sound wave transducer and the second sound wave transducer and the propagation time of the leakage sound waves and the excitation sound waves.
Preferably, the distance between the leakage position and the first acoustic wave transducer is set to be x;
setting the distance between the first acoustic wave transducer and the second acoustic wave transducer to be L;
the time difference between the first acoustic wave transducer and the second acoustic wave transducer for detecting leakage is delta tpeak；
Detecting a time t from a first excited sound wave emitted by the first sound wave transducer to a time when the first excited sound wave is received by the second sound wave transducermea+；
Detection ofThe time from the second excited sound wave emitted by the second sound wave transducer to the time when the first sound wave transducer receives the second excited sound wave is tmea-；
Calculating x to obtain the leak location according to the following equation:
preferably, the excitation sound wave is a sound wave having a frequency far from the center frequency of the noise at the leak position.
Preferably, the amplitude of the excited sound wave is significantly higher than the amplitude of the leakage sound wave.
Preferably, the sound wave generated at the leakage position is broadband noise.
As a preferred technical solution, the detection method first obtains the excitation sound wave by a band-pass filtering method, and then obtains t by various methodsmea+And tmea-。
As a preferred technical solution, the various methods include a cross-correlation method, and the cross-correlation method specifically includes the following steps:
the first acoustic wave transducer constructs a plurality of periods of a first excitation signal;
the second sound wave transducer obtains a first receiving signal through filtering;
performing cross-correlation operation on the first excitation signal and the first receiving signal to obtain a first cross-correlation signal of the first acoustic wave transducer and the second acoustic wave transducer;
calculating t by applying a maximum point search method to the first cross-correlation signalmea+；
The second sound wave transducer constructs a plurality of periods of second excitation signals;
the first acoustic wave transducer obtains a second receiving signal through filtering;
performing cross-correlation operation on the second excitation signal and the second receiving signal to obtain a second cross-correlation signal of the first acoustic wave transducer and the second acoustic wave transducer;
calculating t by applying a maximum point search method to the second cross-correlation signalmea-。
Preferably, the measurement of the forward and backward travel time of the sound wave includes using a pulse wave mode.
As a preferable technical solution, the pulse wave mode includes constructing a pulse wave sequence of 1-20 cycles at the excitation sound wave end of the first sound wave transducer, and the sound wave frequency of the sequence is set to 50-100 KHz.
As a preferable technical solution, the pulse wave mode further includes constructing a pulse wave sequence of 1-20 cycles at the excited sound wave end of the second sound wave transducer, and the sound wave frequency of the sequence is set to 50-100 KHz.
Preferably, the detection method further includes removing an influence of noise on the measurement by filtering.
As a preferable technical means, the Δ tpeakThe detection method of (2) includes a mutual method and/or a spectral method.
The invention also provides a detection system for positioning the leakage position of the pipeline, which is characterized by comprising a first sound wave transducer and a second sound wave transducer, wherein the first sound wave transducer and the second sound wave transducer are respectively arranged at different positions of the pipeline; the first acoustic wave transducer and the second acoustic wave transducer are arranged to receive a leakage acoustic wave caused by a leakage of the pipeline and to excite an excited acoustic wave for locating the leakage position, and the leakage acoustic wave and the excited acoustic wave have different acoustic wave characteristics; the leakage position is calculated according to the distance between the first sound wave transducer and the second sound wave transducer and the propagation time of the leakage sound wave and the propagation time of the excitation sound wave.
One technical solution of the present invention is that the calculation module includes a detection module and an operation module:
setting the distance from the leakage position to the first acoustic wave transducer to be x;
setting the distance between the first acoustic wave transducer and the second acoustic wave transducer to be L;
the detection module is used for detecting the time difference delta t generated by the leakage detection of the first acoustic wave transducer and the second acoustic wave transducerpeak(ii) a Detecting a first excited sound wave of the first sound wave transducer until the second sound wave transducer receives the first excited sound wave at a time tmea+(ii) a Detecting a second excited sound wave of the second sound wave transducer until the first sound wave transducer receives the second excited sound wave at a time tmea-And transmitting the detected numerical value to an operation module;
the operation module calculates x to obtain the leak location according to the following formula:
the invention has the beneficial effects that:
compared with the acoustic wave measurement method in the prior art, the measurement method adopted by the technical scheme of the invention does not need prior knowledge of sound velocity and flow velocity, only needs to determine the installation distance of each adjacent acoustic wave transducer, and the distance can be determined during installation; therefore, prior measurement of sound velocity, flow velocity and the like is omitted during measurement, the measurement is more convenient, meanwhile, measurement errors caused by different propagation speeds of sound waves in different environments are avoided, and the measurement accuracy is improved.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a flow chart summarizing a method of detecting pipeline leaks according to the present invention;
FIG. 2 is a schematic view of acoustic leak localization in the present invention;
FIG. 3a is a graph of a leaked acoustic signal received by the first transducer in the present invention;
FIG. 3b is a graph of a leaked acoustic signal received by the second transducer in the present invention;
FIG. 4 is a cross-correlation signal plot of two transducer signals in accordance with the present invention;
FIG. 5a is a diagram of an excitation signal of a first sonic transducer end in accordance with the present invention;
FIG. 5b is a diagram of a received signal of the second sound transducer end in the present invention;
FIG. 6 is a cross-correlation signal plot of two transducer signals in accordance with the present invention;
FIG. 7a is a diagram of the excitation signal of the second acoustic transducer end in the present invention;
FIG. 7b is a diagram of a received signal of the first sonic transducer terminal of the present invention;
FIG. 8 is a cross-correlation signal plot of two transducer signals in the present invention;
FIG. 9 is a diagram of an embodiment of a detection system for locating a leak location in a pipeline according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The invention will now be further described with reference to the accompanying drawings.
The measurement principle of the invention is as follows:
in view of the fact that the acoustic wave transducer can not only receive acoustic waves, but also emit acoustic waves. At the time difference Δ t of detecting the occurrence of leakagepeakBased on that the sound wave can be transmitted by the sound wave transducer 1, the sound wave can be received by the sound wave transducer 2, and the corresponding time can be expressed as
Similarly, when the acoustic wave transducer 2 emits an acoustic wave and the acoustic wave transducer 1 receives the acoustic wave, the corresponding time can be expressed as
It should be noted that, since the sound wave caused by the leakage in the pipeline still propagates, the sound wave characteristics emitted by the sound wave transducer are different from those caused by the leakage, so that the actively emitted sound wave and the leaked sound wave can be effectively separated.
The product of equation (4) and (5) can be obtained
It should be noted that the basis for the above equation to be approximately established is
The assumption is that
The second order fractional amount of (c) is theoretically advantageous. Equation (2) can be rewritten as
Substituting the formulas (4) to (6) into the above formula
Compared with the measurement method (3) in the background art, the formula adopted by the invention does not need the prior knowledge of the sound velocity and the flow velocity, and only needs to determine the installation distance of the two transducers, and the distance can be determined during installation.
Implementation method
Time delay with respect to leakage
For leakage time delay deltatpeak＝tpeak--tpeak+The estimation can be performed by using cross-correlation, spectrum method, etc. which are commonly used in the prior art. And will not be described in detail.
Acoustic forward and reverse streaming time measurement
Measuring t for forward and reverse propagation timesmea+And tmea-Problematically, the excited acoustic wave signature needs to be well distinguished from the leakage induced acoustic wave signature due to the presence of the leakage induced acoustic wave. The specific method comprises the following steps: first, the acoustic characteristics of the leakage noise and the noise amplitude are obtained by spectral analysis. On this basis, the frequency selective excitation sound wave is selected to be farther from the center frequency of the leakage noise. Meanwhile, the excitation source needs to have energy with certain intensity, so that the amplitude of the excited sound wave is obviously higher than that of the leakage noise. The sound wave received by the other probe firstly obtains the excitation sound wave data by methods such as band-pass filtering and the like, and then obtains the propagation time t by various methodsmea+And tmea-。
The acoustic wave transducer can realize the conversion of electric signals and acoustic waves (mechanical waves), and can construct excitation signals (electric signals) of a plurality of periods and convert the excitation signals into excitation acoustic waves to be transmitted in the pipeline; the acoustic wave transducer can also convert the received excited acoustic wave into a received signal (electrical signal). The excitation signal and the receiving signal can be subjected to data analysis through an operation module of the system.
Example 1: detection method for positioning leakage position of pipeline
Embodiments of the present invention illustrate the above analysis using a cross-correlation method. In FIG. 2, it is assumed that the straight pipeline has a length L1The distance x of the leakage source from the transducer 1 is 0.3m, 1 m. According to the jet noise theory, the sound waves generated by the leakage source belong to broadband noise. For simplicity of analysis, the frequency of the acoustic wave generated by the leakage source is assumed to be 100Hz and the amplitude of the acoustic wave is 0.1. The flow velocity v in the pipe is 10m/s, and the propagation velocity c of the acoustic wave in the stationary fluid is 1500ms., so the acoustic wave signals received by the first acoustic wave transducer and the second acoustic wave transducer are shown in fig. 3a and 3 b.
The two signals are cross-correlated (obtained by xcorr standard function in matlab) to obtain the information shown in fig. 4.
Obtaining the maximum point of cross-correlation by a maximum value searching method, wherein the time corresponding to the maximum point is delta tpeak0.26 ms. From equation (2), a theoretical delay of 0.262ms can be obtained.
For the propagation time measurement problem, many methods can be adopted for realization. The embodiment of the invention only lists the pulse wave mode, and is not limited to the mode actually. At the excitation end (first acoustic wave transducer), a 10-cycle pulse wave sequence (acoustic wave frequency set to 50KHz) was constructed. The receiving end (second sound transducer) obtains the signals shown in fig. 5a and fig. 5b after filtering.
By performing a cross-correlation operation on the above signals, information as shown in fig. 6, i.e., a cross-correlation signal (the cross-correlation signal is essentially a correlation degree between two time series) can be obtained.
Finding the maximum value of the correlation degree between two time sequences by using a maximum point searching method aiming at the cross-correlation signals), and obtaining the timeThe delay estimate is tmea+0.663 ms. The theoretical value of 0.662ms can be obtained by the calculation of (4).
The counterflow situation is consistent with the forward flow situation. At the excitation end (second sound wave transducer), a 10-cycle pulse wave sequence (sound wave frequency set to 50KHz) was constructed. The receiving end (the first acoustic wave transducer) obtains the signals shown in fig. 7a and 7b after filtering.
By performing a cross-correlation operation on the above signals, information as shown in fig. 8, i.e., a cross-correlation signal (the cross-correlation signal is essentially a correlation degree between two time series) can be obtained.
The time delay estimate is obtained as t by using a maximum point search method (i.e. finding the maximum value of the correlation degree between two time sequences) for the cross-correlation signalsmea-0.672 ms. The theoretical value of 0.671ms can be obtained by the calculation of (4).
By using the formula (6), the measured value of the sound velocity is 1498m/s, and the theoretical set value is 1500m/s
With equation (8), a measured value of 0.301m for the position of the leak source can be obtained; the theoretical setpoint is 0.3 m.
It should be noted that the method is further studied on the basis of the conventional leak location method. In the propagation forward-backward flow measurement, a detection signal inconsistent with the characteristics of the leakage signal needs to be constructed, square waves and the like can be adopted besides the sine waves mentioned in the example analysis, and the number of the sine wave periods is not limited to 10.
In the signal processing process, the problem of filtering is not mentioned in the present example, and the influence of noise on the measurement needs to be removed through filtering in the actual signal process.
In the example, only a standard cross-correlation method is listed, and a delay estimation algorithm with stronger noise suppression can be selected for signal noise.
Example 2: detection system for positioning leakage position of pipeline
As shown in fig. 9, an embodiment of the present invention is a detection system for locating a pipeline leakage position, including a first acoustic wave transducer and a second acoustic wave transducer, which are respectively installed at different positions of a pipeline; the first acoustic wave transducer and the second acoustic wave transducer are arranged to receive a leakage acoustic wave caused by a leakage of the pipeline and excite an excited acoustic wave for locating a leakage position, and the leakage acoustic wave and the excited acoustic wave have different acoustic wave characteristics; the device also comprises a calculation module which is used for calculating and obtaining the leakage position according to the distance between the two sound wave transducers and the propagation time of the leakage sound wave and the excitation sound wave.
The positions of the two acoustic wave transducers in the embodiment of the present invention may be set with reference to the positions of the acoustic wave transducer 1 and the acoustic wave transducer 2 in fig. 2. Compared with the system in the prior art, the embodiment of the invention is mainly additionally provided with the calculation module, and the calculation module is mainly used for measuring corresponding parameters according to the method in the embodiment 1 and obtaining the required numerical value.
Specifically, the calculation module includes a detection module and an operation module:
setting the distance between the leakage position and the first acoustic wave transducer as x;
setting the distance between the first acoustic wave transducer and the second acoustic wave transducer to be L;
the detection module is used for detecting the time difference delta t generated by leakagepeakDetecting the time t for the first sound wave transducer to emit sound waves and the time t for the second sound wave transducer to receive excited sound wavesmea+Detecting the time t for the second sound wave transducer to emit the exciting sound wave and the time t for the first sound wave transducer to receive the exciting sound wavemea-And transmitting the detected numerical value to an operation module;
the operation module calculates x to obtain a leak location according to the following formula:
the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (12)
1. A detection method for positioning a pipeline leakage position is characterized in that a first sound wave transducer and a second sound wave transducer are arranged and respectively installed at different positions of a pipeline; the first acoustic wave transducer and the second acoustic wave transducer can receive leakage acoustic waves caused when the pipeline leaks, excitation acoustic waves used for positioning the leakage position can be mutually excited and received between the first acoustic wave transducer and the second acoustic wave transducer, the leakage acoustic waves and the excitation acoustic waves have different acoustic wave characteristics, and the leakage position is obtained through calculation according to the distance between the first acoustic wave transducer and the second acoustic wave transducer and the propagation time of the leakage acoustic waves and the propagation time of the excitation acoustic waves;
setting the distance from the leakage position to the first acoustic wave transducer to be x;
setting the distance between the first acoustic wave transducer and the second acoustic wave transducer to be L;
the time difference between the first acoustic wave transducer and the second acoustic wave transducer for detecting leakage is delta tpeak；
Detecting a time t from a first excited sound wave emitted by the first sound wave transducer to a time when the first excited sound wave is received by the second sound wave transducermea+；
Detecting a second excited sound wave emitted by the second sound wave transducer until the first sound wave transducer receives the second excited sound wave at a time tmea-；
Calculating x to obtain the leak location according to the following equation:
2. the method of claim 1, wherein the exciting acoustic wave is an acoustic wave that is further away from a center frequency of the noise at the leak location.
3. The detection method of claim 1, wherein the amplitude of the excitation acoustic wave is substantially higher than the amplitude of the leakage acoustic wave.
4. The method of claim 1, wherein the acoustic wave generated at the leak location is broadband noise.
5. The detection method according to claim 1, wherein the detection method first obtains the excited sound wave by a band-pass filtering method, and then obtains t by various methodsmea+And tmea-And the various methods comprise a cross-correlation method and a time delay estimation algorithm.
6. The detection method according to claim 5, characterized in that said cross-correlation method comprises in particular the steps of:
the first acoustic wave transducer constructs a plurality of periods of a first excitation signal;
the second sound wave transducer obtains a first receiving signal through filtering;
performing cross-correlation operation on the first excitation signal and the first receiving signal to obtain a first cross-correlation signal of the first acoustic wave transducer and the second acoustic wave transducer;
calculating t by applying a maximum point search method to the first cross-correlation signalmea+；
The second sound wave transducer constructs a plurality of periods of second excitation signals;
the first acoustic wave transducer obtains a second receiving signal through filtering;
performing cross-correlation operation on the second excitation signal and the second receiving signal to obtain a second cross-correlation signal of the first acoustic wave transducer and the second acoustic wave transducer;
calculating t by applying a maximum point search method to the second cross-correlation signalmea-。
7. The method of claim 1, wherein said measuring of forward and reverse acoustic travel time comprises using pulsed wave mode.
8. The detection method according to claim 7, wherein the pulsed wave mode comprises constructing a 1-20 cycle pulsed wave sequence at the excitation acoustic side of the first acoustic wave transducer, the acoustic frequency of the sequence being set to 50-100 KHz.
9. The detection method according to claim 7, wherein the pulse wave mode further comprises constructing a pulse wave sequence of 1-20 cycles at the excited sound wave end of the second sound wave transducer, and the sound wave frequency of the sequence is set to 50-100 KHz.
10. The detection method of claim 1, further comprising removing the effect of noise on the measurement using filtering.
11. The detection method according to claim 1, wherein Δ t is the same as Δ tpeakThe detection method of (a) includes a cross-correlation method and/or a spectral method.
12. A detection system for positioning a pipeline leakage position is characterized by comprising a first sound wave transducer and a second sound wave transducer which are respectively arranged at different positions of a pipeline; the first acoustic wave transducer and the second acoustic wave transducer are arranged to receive a leakage acoustic wave caused by a leakage of the pipeline and to excite an excited acoustic wave for locating the leakage position, and the leakage acoustic wave and the excited acoustic wave have different acoustic wave characteristics; the calculation module is used for calculating the leakage position according to the distance between the first sound wave transducer and the second sound wave transducer and the propagation time of the leakage sound wave and the excitation sound wave;
the calculation module comprises a detection module and an operation module:
setting the distance from the leakage position to the first acoustic wave transducer to be x;
setting the distance between the first acoustic wave transducer and the second acoustic wave transducer to be L;
the detection module is used for detecting the time difference delta t generated by the leakage detection of the first acoustic wave transducer and the second acoustic wave transducerpeak(ii) a Detecting a first excited sound wave of the first sound wave transducer until the second sound wave transducer receives the first excited sound wave at a time tmea+(ii) a Detecting a second excited sound wave of the second sound wave transducer until the first sound wave transducer receives the second excited sound wave at a time tmea-And transmitting the detected numerical value to an operation module;
the operation module calculates x to obtain the leak location according to the following formula:
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