TWI630379B - A leak detection system - Google Patents

Abstract

The invention discloses a leak detection system for judging the water leakage position of an underground pipeline. The leak detection system of the invention comprises a signal measuring device, an analysis module and a notification module. The signal measuring device is in contact with the road surface of the underground pipeline to be tested to measure the water leakage signal of at least one position of the road surface. The analysis module converts the water leakage signal into a corresponding time-frequency signal, and then the notification module sets the time-frequency signals of different time or different measurement positions with the time as the horizontal axis and the frequency as the vertical axis and in the color The signal strength is presented in an interactive manner to determine the location of the leak. Compared with the prior art, the invention effectively reduces the operational difficulty and environmental demand of the underground water pipe leak detection.

Description

Leak detection system

The present invention relates to a leak detection system and, in particular, to a leak detection system for determining the location of a water pipe leak.

With the advancement of the times, the undergroundization of water pipes has become a common way of facilities in today's society. The localized water pipes have been ruptured due to aging or natural disasters, resulting in the inability of the reservoir water to be effectively transmitted to various users, which in turn has caused the waste of water resources to become an urgent problem in real life.

The traditional groundwater pipe rupture detection technology is used to detect the sound transmitted by the ground surface by contacting a leak detector on the road surface where the underground water pipe is buried. The operator subsequently listens to the sound of the road surface by means of recording or transferring the leak detector, and determines whether It contains leaking sounds. Common leak detectors can be divided into two types: full audio and specific audio. The latter is suitable for filtering noise caused by strange and noisy environments. However, the accuracy of the leak detection system depends on the degree of noise in the external environment and the operator's operating experience, whether or not the specific audio leak detector is used.

The above-mentioned prior art technology relies on the environment, the experience of the operator, and the physical condition of the day outside of the detection, and cannot effectively achieve dataization and convenience of operation. In view of this, the present invention provides a leak detection system, which can be simply and more efficiently Determine the location of the water pipe leakage.

One aspect of the present invention is to provide a leak detection system. According to an embodiment of the present invention, the leak detection system of the present invention is used to determine the water leakage position of the underground pipeline. The underground pipeline is buried under the road surface, and includes a signal measuring device, an analysis module and a notification module. The signal measuring device is configured to contact the road surface buried with the underground pipeline, and perform signal measurement on at least one measuring position of the road surface to generate a corresponding at least one water leakage signal. The analysis module is configured to receive the water leakage signal and use a time-frequency analysis to generate a corresponding time-frequency signal. The notification module is connected to the analysis module for receiving the time-frequency signal. Wherein, according to the frequency and signal intensity corresponding to each time-frequency signal of the notification module, the water leakage position of the underground pipeline is judged.

Furthermore, the present invention can determine the water leakage position of the underground water pipe according to the time-frequency signal having the highest frequency and the highest intensity among the time-frequency signals of the notification module and referring to the measured position.

In practical applications, the signal measuring device of the leak detection system of the present invention can be combined with a wireless module to wirelessly transmit the water leakage signal to the analysis module. The analysis module can be a mobile device or an application executed on the cloud server and wirelessly transmitted back to the user's mobile device.

In addition, the leak detection system of the present invention can be an in-vehicle system, and each measurement position is marked by a stable traveling vehicle, and data processing is performed through the analysis module and the notification module on the leak detection system, so that it can be obtained instantly and conveniently. Accurate water leak location.

Compared with the prior art, the leak detection system of the present invention is based on the notification module. The time-frequency signal with the highest frequency and the highest signal strength is used to judge the water leakage signal. Further, the time-frequency analysis of the time is the horizontal axis, the frequency is the vertical axis, and the color is the signal strength. The leaking signal can be used to determine the correct leak range with the corresponding signal source location. With the leak detection system of the present invention, the operator does not need to judge the leak position by his own experience, nor is it affected by external environmental factors, and provides a simple and more efficient underground water pipe leak detection technique.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

1, 2‧‧‧ leak detection system

12‧‧‧ Signal measuring device

14‧‧‧Mobile devices

16‧‧‧Underground pipeline

18‧‧‧ pavement

22‧‧‧Wireless Module

32‧‧‧Cloud Server

34‧‧‧ Terminal

142‧‧‧Analysis module

144‧‧‧Notification module

162‧‧‧Water leak location

A~E‧‧‧Measurement position

S ₂₁ ~ S ₂₅ ‧‧‧ leaking signal

S ₄₁ ~S ₄₅ ‧‧‧Time-frequency signal

Figure 1 is a schematic view showing a first embodiment of the leak detection system of the present invention.

Figure 2 is a functional block diagram showing a first embodiment of the leak detection system of the present invention.

FIG. 3A is a schematic diagram showing the water leakage signal received by the analysis module of the leak detection system of the present invention.

FIG. 3B is a diagram showing the time-frequency signal color map displayed by the display module of the leak detection system of the present invention.

Figure 4 is a schematic view showing a second embodiment of the leak detection system of the present invention.

Figure 5 is a functional block diagram showing a second embodiment of the leak detection system of the present invention.

The present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, FIG. 1 is a schematic diagram showing a first embodiment of the leak detection system 1 of the present invention, and FIG. 2 is a functional block diagram showing a first embodiment of the leak detection system 1 of the present invention. In the first embodiment of the present invention, the leak detection system 1 of the present invention is used to determine the water leakage position 162 of the underground pipeline 16, and the underground pipeline 16 is buried under the road surface 18, and includes a signal measuring device 12 and an analysis module. 142 and a notification module 144. The signal measuring device 12 is configured to contact the road surface 18 in which the underground pipeline 16 is embedded, and perform signal measurement on a plurality of measurement positions A to E of the road surface 18, thereby generating a plurality of corresponding water leakage signals S ₂₁ to S ₂₅ . The analysis module 142 is configured to receive the water leakage signals S ₂₁ -S ₂₅ and generate a corresponding plurality of time-frequency signals S ₄₁ -S ₄₅ by using a time-frequency analysis technique. The notification module 144 is connected to the analysis module 142 for receiving the time-frequency signals S ₄₁ -S ₄₅ , and further, the notification module 144 is a display module, with the time being the horizontal axis and the frequency being The vertical axis and the color are the signal strength, and the frequency signals S ₄₁ ~ S ₄₅ are presented under the frequency noise excluding the non-leakage signal. The leaking position 162 of the underground pipeline 16 is determined according to the frequency and signal strength corresponding to each time-frequency signal S ₄₁ - S ₄₅ of the notification module 144.

In the first embodiment of the present invention, the signal measuring device 12 performs signal measurement on a plurality of measurement positions A to E of the road surface 18 under a range of the leak detection frequency to generate the water leakage signals S ₂₁ ~ S ₂₅ , and the leak detection frequency ranges from 200 Hz to 800 Hz to eliminate frequency noise of non-leakage signals. The plurality of measurement positions A~E are defined by the road surface 18 in which the underground pipeline 16 is buried every 1 meter. In actual operation, the signal measuring device 12 measures 30 seconds before the point A to generate the water leakage signal S ₂₁ , and then measures to the point B of the road surface 18 buried with the underground pipeline 16 at a distance of 1 meter from the point for 30 seconds. The water leakage signal S _{22 is obtained} , and then the continuous measurement C, D, E is made to the water leakage signals S ₂₃ ~ S ₂₅ . The water leakage signals S ₂₁ ~ S ₂₅ must at least cover the signal of the underground pipeline 16 of 0.5 m square. The signal measuring device 12 is a sound receiver that receives the sound signals transmitted by the road surface 18 through the contact measurement positions A~E. In another embodiment, the signal measuring device 12 is a displacement monitor that detects the vibration displacement of the road surface 18 to generate a water leakage signal. The displacement monitor can be further divided into a contact type or a contactless mode. The device of the monitoring method, such as an optical type, wherein the contact device can be an aluminum-iron triangle nail with a PZT piezoelectric material to monitor the vibration displacement of the road surface 18 into a potential change, and the The optical device can measure the displacement of the road surface 18 by measuring the distance from the site to the road surface 18 using a laser light amount.

In an actual application, the analysis module 142 and the notification module 144 are disposed on a mobile device 14. The analysis module 142 is electrically connected to the signal measuring device 12 for receiving the water leakage signals S ₂₁ ~ S ₂₅ , and the analysis module 142 generates a plurality of corresponding time frequency signals S ₄₁ ~ S ₄₅ by using a time-frequency analysis technique. And transmitted to the notification module 144 of the mobile device 14. In practical applications, the time-frequency analysis is to convert a time-series signal into a conversion method with time as the horizontal axis, frequency as the vertical axis, and color as the signal intensity. The conversion method is to use fast Fourier transform (FFT), Technology conversions such as Hilbert-Huang Transform (HHT) or Wavelet Transform.

Referring to FIG. 1 and FIG. 3, FIG. 3A is a schematic diagram of the water leakage signal S ₂₁ ~ S ₂₅ received by the analysis module 142 of the leak detection system 1 of the present invention, and FIG. 3B is a diagram showing the display of the leak detection system 1 of the present invention. The module displays the time-frequency signal S ₄₁ ~ S ₄₅ color map. The analysis module 142 receives the water leakage signals S ₂₁ ~ S _{25 in} parallel, and then uses the time-frequency analysis technology to generate a plurality of corresponding time-frequency signals S ₄₁ -S ₄₅ . When the display module receiving such frequency signals S ₄₁ ~ S _45, while the horizontal axis by time, frequency and the ordinate is the signal strength so as to exhibit a color when such frequency signals S ₄₁ ~ S _45. The leak location 162 of the underground pipeline 16 is determined according to the measurement position C corresponding to the time-frequency signal S _{43 of} the highest frequency and the highest signal strength among the time-frequency signals S ₄₁ -S ₄₅ of the display module. . In another embodiment, the analysis module 142 may calculate the difference between the frequency or intensity of the abnormal time-frequency signals S ₄₃ and S ₄₄ and the normal signal to further infer the correct water leakage position 162 of the underground pipeline 16 .

Referring to FIG. 4 and FIG. 5, FIG. 4 is a schematic diagram showing a second embodiment of the leak detection system 2 of the present invention, and FIG. 5 is a functional block diagram showing a second embodiment of the leak detection system 2 of the present invention. In the second embodiment of the present invention, the leak detection system 2 includes a signal measuring device 12, an analysis module 142, a notification module 144, and a wireless module 22. The signal measuring device 12 is configured to contact the road surface 18 in which the underground pipeline 16 is embedded, and perform signal measurement on a plurality of measurement positions A to E of the road surface 18, thereby generating a plurality of corresponding water leakage signals S ₂₁ to S ₂₅ . The wireless module 22 is electrically connected to the signal measuring device 12 for receiving the water leakage signals S ₂₁ -S ₂₅ and wirelessly transmitting the water leakage signals S ₂₁ -S ₂₅ to the analysis module 142 . The analysis module 142 is configured to receive the plurality of time-frequency signals S ₄₁ -S ₄₅ by using the time-frequency analysis after receiving the water leakage signals S ₂₁ -S ₂₅ . The notification module 144 is coupled to the analysis module 142 for receiving the time-frequency signals S ₄₁ -S ₄₅ . The leaking position 162 of the underground pipeline 16 is determined according to the frequency and signal strength corresponding to each time-frequency signal S ₄₁ - S ₄₅ of the notification module 144.

Furthermore, the analysis module 142 is implemented as an application executed by the mobile device 14 or the cloud server 32. The notification module 144 is an application executed on the mobile device 14 or the terminal device 34. Further, the notification module 144 is configured as an audible alarm module, and the received time-frequency signals S ₄₁ - S _{45 are} excluded from the frequency noise of the non-leakage signal and converted into a sound output for the user to listen to. The sound can be judged by different sounds or audio.

In practical applications, the signal measuring device 12 of the leak detection system 2 of the present invention can be combined with a positioning system to transmit the current measurement positions A~E to the analysis module 142 when the water leakage signals S ₂₁ to S _{25 are} generated. Subsequent positioning confirmation. The signal measuring device 12 can also be combined with a shooting device or a preset street view photo. When the water leakage signals S ₂₁ to S _{25 are} generated, the generating positions A to E are marked to the analysis module 142 for subsequent positioning confirmation.

In addition, the signal measuring device 12 of the leak detecting system 2 of the present invention can be an in-vehicle system, and the person can contact the signal measuring device 12 on the road surface 18 required for measurement by setting the equidistant walking mode of the vehicle, thereby generating It can be estimated that the measurement position A~E. The vehicle can be a stable forward vehicle such as a car, a motorcycle, a tricycle, a bicycle or a trolley. Furthermore, the leak detection system 2 of the present invention can be a portable wearable device, such as a backpack-type device, which can be moved by the user to achieve an instant and convenient leak detection function.

In another embodiment, the leak detection system 2 of the present invention performs a single point leak detection of a fixed point for a relatively vulnerable portion such as a transition or a bend of the underground pipeline 16. The user can use the signal measuring device 12 to measure the road surface 18 to monitor the underground pipeline 16 to generate a water leakage signal, and then use the analysis module 142 to convert the water leakage signal into a corresponding time-frequency signal through time-frequency analysis, and then compare Whether the signal strength and frequency in the time-frequency signal taken out at the same place but at different times are consistent or within the error tolerance range, so as to determine whether the position of the underground pipeline 16 monitored at the current time remains stable or has leaked, thereby monitoring Whether there is a leak in every vulnerable area. The signal measuring device 12 is matched with the wireless module 22, and the wireless module 22 remotely controls the signal measuring device 12 and captures the water leakage signal to achieve the remote monitoring function.

Compared with the prior art, the leak detection system of the present invention determines the water leakage signal by the notification module according to the time-frequency signal having the highest frequency and the highest signal strength, and further, the time is the horizontal axis, the frequency is the vertical axis, and The time-frequency analysis of the color signal intensity shows the underground pipeline leak signal. The leaking signal can be used to determine the correct leak range with the corresponding signal source location. With the leak detection system of the present invention, the operator does not need to judge the leak position by his own experience, nor is it affected by external environmental factors, and provides a simple and more efficient underground water pipe leak detection technique.

The present invention has been described in detail with reference to the preferred embodiments of the present invention. All modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (10)

A leak detection system for determining a water leakage position of an underground pipeline, the underground pipeline being embedded under a road surface, comprising: a signal measuring device for contacting the road surface buried with the underground pipeline, and for The plurality of measurement positions of the road surface are measured by signals to generate a plurality of corresponding water leakage signals; an analysis module is configured to receive the water leakage signals and use a time-frequency analysis to generate corresponding plurality of time-frequency signals And a notification module connected to the analysis module for receiving the time-frequency signals; wherein the notification module determines the time-frequency signal according to the highest frequency in the received time-frequency signals The leaking position of the underground pipeline. The leak detection system of claim 1, wherein the notification module further determines the water leakage position of the underground pipeline according to the received time-frequency signal having the highest signal strength among the received time-frequency signals. The leak detection system of claim 2, wherein the leak position of the underground pipeline is determined according to the measurement position corresponding to the time-frequency signal having the highest frequency and the highest signal strength. The leak detection system of claim 1, wherein the signal measuring device performs signal measurement on the measurement positions of the road surface to generate the water leakage signals under a leak detection frequency range, and The leak detection frequency ranges from 200 Hz to 800 Hz. The leak detection system of claim 1 further includes a wireless module, wherein the wireless module is electrically connected to the signal measuring device for receiving the water leakage signals and wirelessly transmitting the water leakage signals to the Analysis module. The leak detection system of claim 5, wherein the analysis module and the notification module are an application executed on the mobile device. The leak detection system of claim 5, wherein the analysis module is an application executed on a cloud server, and the notification module is an application executed on a mobile device or a terminal. The leak detection system of claim 1, wherein the leak detection system is disposed in a vehicle, and the vehicle is a car, a motorcycle, a tricycle or a bicycle. The leak detection system according to claim 1, wherein the time-frequency analysis converts a time-series signal into a conversion method using time as a horizontal axis, a frequency as a vertical axis, and a color as a signal strength, the conversion The method uses Fast Fourier Transform (FFT), Hilbert-Huang Transform (HHT) or Wavelet Transform. The leak detection system of claim 1, wherein the notification module is a display module, wherein the display module transmits the signal by using the time as the horizontal axis, the frequency as the vertical axis, and the color as the signal strength. Equal time frequency signal.