KR20170006149A

KR20170006149A - Leakage detecting apparatus

Info

Publication number: KR20170006149A
Application number: KR1020150096654A
Authority: KR
Inventors: 김호
Original assignee: (주)본테크놀러지
Priority date: 2015-07-07
Filing date: 2015-07-07
Publication date: 2017-01-17
Also published as: KR101749519B1

Abstract

The present invention relates to a water leakage detecting device capable of rapidly and accurately detecting a water leakage and a position of the water leakage using acoustic sensors. According to the present invention, the water leakage detecting device comprises: a first sound wave detecting device moving inside a pipeline, and equipped with the first acoustic sensor detecting sound waves generated by the water leakage from the pipeline; a second sound wave detecting device arranged on a rear side of the first sound wave detecting device in a movement direction (hereinafter, a first direction) of the first sound wave detecting device to be separated from the first sound wave detecting device, moving the first sound wave detecting device in the first direction while moving a distance from the first sound wave detecting device, and equipped with a second acoustic sensor detecting the sound waves generated by the water leakage from the pipeline; and a signal reading unit comparing first acoustic signals collected by the first sound wave detecting device and second acoustic signals collected by the second sound wave detecting device to detect information about the water leakage from the pipeline.

Description

LEAKAGE DETECTING APPARATUS

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a water leakage detection device, and more particularly, to a water leakage detection device for detecting a water leakage point while moving along an inside of a pipe through which a fluid flows.

Generally, leaks generally mean not only structurally but also the loss of water due to corrosion or erroneous connections, and may also cause contamination of tap water due to entry of foreign matter in the case of leakage of tap water. Therefore, it is important to accurately detect the leaked water, such as a pipe embedded in the underground, for example, to quickly detect a leak formed in the pipe line.

Conventional leak detection is a method in which a worker directly seizes a leak detection device and moves to an area where a leak is expected to be detected, and then detects leakage of the leaked water from the ground. When a sound caused by leakage is transmitted to the ground surface, , And then it was directly heard by a receiver worn by a worker or analyzed by a meter to determine a leak position. However, the water supply pipeline is required to be buried at a depth of 1.2 M or more on the ground by regulation, so that it is extremely difficult to detect when a small amount of water is leaked, and it is difficult to accurately detect the water leakage point. Furthermore, in the case of detecting a leak in a water line installed under frequent traffic roads, it was difficult to detect because the traffic noise due to vehicle traffic was transmitted to the leak detector together with the noise generated in the underground. In addition, there is a problem in that it is almost impossible to detect the leakage position when the pipeline is three-dimensionally buried or pipelines in which electric wires are buried together.

In order to solve such a problem, it is proposed to detect leakage of the water pipe through a pressure sensor that detects the hydraulic pressure drop occurring when the water pipe leaks, or to detect the leakage of the water pipe through an acoustic sensor that detects the sound wave generated when the water pipe leaks. A leak sensing device for sensing is proposed. A conventional leak detection apparatus for detecting leakage of water by using hydraulic pressure or sound waves will be described as follows.

In Korean Patent Laid-Open No. 10-2002-0045430, the entire old water pipe line of the measurement target area is divided into blocks by the main and branch offices, and the block valve is connected to the old water pipe line at the start point and the end point of each block unit And a field data collecting / transmitting device for transmitting sensed data of the pressure measuring sensor is welded to the old water pipe line and the upper open area is covered with a cover in which a wireless antenna is installed. A portable data collector capable of wirelessly collecting pressure data by moving close to the water leakage sensing device while being mounted on a vehicle, a management computer and a water leakage display board, and a data recording / storing device And the portable data collector collecting the pressure data is connected to display the leakage point and the corresponding There is disclosed a water leakage monitoring system to the old pipes, characterized in that comprising an the remote management center to store the data.

Korean Patent No. 10- 1062361 discloses a water leakage detection apparatus for a water supply pipe which detects leakage of a water supply pipe through an acoustic sensor for detecting a sound wave generated when a water leakage occurs in a water supply pipe, A communication unit for transmitting information sensed by the sound detection sensor, and a controller for analyzing information sensed by the sound detection sensor to check whether or not the water supply pipe is leaking, And a control unit for remotely transmitting the result through the communication unit.

Korean Patent Laid-Open No. 10-2013-0044414 discloses an acoustic leak which can detect a sound of a leak when an internal pressure is generated, such as a leak in a building such as an apartment, The present invention relates to a sensor, which comprises an acoustic receiving disk for receiving sound generated from a leak in a housing, a piezo buzzer equipped with a piezoelectric element for converting the acoustic into an electrical signal, a disk for fixing the piezo buzzer, A sound absorbing sponge that fixes the piezoelectric buzzer to the housing and blocks a signal received at the piezo buzzer from being transmitted to the housing, a cushion rubber that prevents a signal received at the surface of the inspected object from entering the housing, And an acoustic sensor for detecting a leak.

However, in the water leakage detection device for a water supply pipe as described above, if frequency noise corresponding to a leakage sound does not increase when the water leakage detection device approaches the water leakage point, or if the overall frequency noise increases even if it approaches the water leakage point, It is difficult to precisely detect the occurrence and the position thereof.

As a result, there has been a limit to finding a leak sound through frequency analysis or spectrum analysis of a leak sound only by data collected through a hydraulic pressure sensor or an acoustic sensor.

In addition, if a sensor is installed on a block-by-channel basis along the pipeline, it is possible to quickly detect the leak, but the length of the detection device is excessively increased and the construction cost is inefficient.

Prior Patent 1. Korean Patent Publication No. 10-2002-0045430 (Jun. 19, 2002) Prior Patent 2. Korean Patent No. 10-1062361 (Aug. 30, 2011) Prior Patent 3. Korean Patent Publication No. 10-2013-0044414 (March 31, 2013)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a leakage detection device capable of accurately and quickly detecting the occurrence of leakage and its position even if it is configured to detect leakage based on an acoustic sensor. .

According to an aspect of the present invention, there is provided a leakage detection apparatus comprising: a first sound wave detection device mounted on a first sound sensor moving along an inside of a conduit and detecting a sound wave generated by a leakage of the conduit; Is disposed in a rear area of the first sound wave detecting device at a distance from the first sound wave detecting device with reference to a moving direction of the first sound wave detecting device (hereinafter referred to as a 'first direction'), A first sound wave detecting device mounted with a second sound sensor for holding a state spaced apart from the detecting device and moving in the first direction together with the first sound wave detecting device and detecting a sound wave generated by water leakage of the channel; A signal for performing mutual comparison processing of a first sound signal collected by the first sound wave detecting device and a second sound signal collected by the second sound wave detecting device so as to detect leak- And a reading unit.

According to the leakage detection apparatus of the present invention, leakage is detected by reading out two noise signals, rather than simply detecting a leakage sound by the acoustic sensor. Therefore, even when the leak sound is weak, It is possible to accurately detect the presence or absence of the water leakage and the occurrence position thereof and to track the relative position of the water leakage point according to the movement position of the water leakage detection device in real time.

1 is a block diagram of a leakage detection device according to the present invention;
FIG. 2 is a schematic view of a leakage detection device according to the present invention inserted into a pipeline; FIG.
FIG. 3 (a) is a schematic view showing a state before passing the water leakage point L1 of the water leakage detection device according to the present invention. FIG.
FIG. 3 (b) is a graph showing the waveforms of the first acoustic signal and the second acoustic signal collected in the state of FIG. 3 (a).
FIG. 4 (a) is a schematic view showing a state after passing the water leakage point L1 of the water leakage detection apparatus according to the present invention. FIG.
FIG. 4B is a graph showing the waveforms of the first acoustic signal and the second acoustic signal collected in the state of FIG. 3B; FIG.
FIG. 5 is a graph showing a phase difference value according to a time point before, during, and after a water leakage point L1 of a water leakage detection apparatus according to the present invention. FIG.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, in the present specification, the term " above or above "means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction. It will also be understood that when a section of an area, plate, or the like is referred to as being "above or above another section ", this applies not only to the case where the other section is " And the like.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

Also, in this specification, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In the following, preferred embodiments, advantages and features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a leakage detection apparatus according to the present invention, and FIG. 2 is a schematic diagram of a leakage detection apparatus according to the present invention, which is inserted into a pipeline.

1 and 2, the leakage detection apparatus according to the present invention includes a first sound wave detection device 10, a second sound wave detection device 20, and a second sound wave detection device 10, which are inserted into the channel 1 and move along the channel 1, And a signal reading section 30 for analyzing acoustic signals collected by the first sound wave detecting device 10 and the second sound wave detecting device 20, including a gap holding member 40.

For reference, the 'channel 1' into which the first sound wave detecting device 10 and the second sound wave detecting device 20 of the present invention are inserted means that a fluid such as water or oil is filled in a section such as a conduit or a pipeline, Refers to flowing piping.

Specifically, the first sound wave detecting apparatus 10 of the present invention includes a first housing 11, a first acoustic sensor 12, a first circuit unit 13, and a first data storage unit 14.

A first housing 11 of the present invention is provided with a space therein and is provided with a waterproofing function. A first acoustic sensor is mounted on the inner or outer surface of the first housing 11, and a first circuit unit 13 And a first data storage unit 14 may be mounted.

According to a preferred embodiment, the first housing 11 is configured to include at least a curved surface so as to be movable while minimizing the resistance of water when the first sound wave detecting apparatus 10 floats along the channel 1. [ For example, the front end of the first housing 11 may have a convex curved surface in the moving direction of the first sound wave detecting device 10, and the body may have a cylindrical shape, or may have an elliptical cross section such as a rugby ball shape .

Preferably, the first housing 11 is formed of a low-density material having a specific gravity smaller than the specific gravity of the fluid so that the first sound wave detecting device 10 does not sink into the fluid in the channel and can always float.

The first acoustic sensor 12 of the present invention is installed on the inner or outer surface of the first housing 11 to collect acoustic waves, 12 is constituted by a sensor capable of detecting a sound wave occurring within a certain radius of a point where the first sound wave detecting apparatus 10 is located.

According to a preferred embodiment, the first acoustic sensor 12 comprises a microphone or a hydrophone. In this case, the microphone or hydrophone receives the sound wave generated by the water leakage and converts it into an electrical signal, And to collect acoustic signals according to the received signals. Hereinafter, an acoustic signal obtained by the first acoustic sensor 12 mounted on the first sound wave detecting apparatus 10 will be referred to as a 'first sound signal S1'.

In general, the sound waves generated according to the leaks are generated in a constant size unlike the sound waves generated by the surrounding temporary noise (for example, construction, vehicles, etc.) and continue to occur unless the leakage is stopped. Is continuously detected.

Therefore, if there are sound waves continuously generated and generated in the same size among the various sound waves sensed by the first acoustic sensor 12, it is a sound wave due to leakage water. By collecting and analyzing such sound waves, leakage information, It is possible to detect the occurrence and its position.

The first circuit unit 13 of the present invention includes a signal conversion unit for receiving an analog first sound signal collected through the first sound sensor 12 of the first sound wave detecting apparatus 10 and converting the analog first sound signal into a digital first sound signal And the signal conversion unit may be, for example, an A / D converter (Analog to Digital Converter).

The first data storage unit 14 of the present invention is configured to record and store the digital first sound signal converted by the circuit unit, and may be configured as either an external memory or a built-in memory.

The second sound wave detecting device 20 of the present invention comprises a second housing 21, a second acoustic sensor 22, a second circuit portion 23 and a second data storage portion 24, And is arranged rearwardly of the first sound wave detecting device 10 so as to be spaced apart from the first sound wave detecting device 10 by a predetermined distance.

The second sound wave detecting device 20 is configured so as to be always spaced apart from the first sound wave detecting device 10 rearward and to move in the same direction along the inside of the channel with the first sound wave detecting device 10 .

In the following description, the term 'front direction and rear direction of the first sound wave detecting apparatus 10' used in the present invention is defined as a moving direction of the first sound wave detecting apparatus 10 (hereinafter referred to as a 'first direction K1' The direction toward the moving direction side corresponds to the forward direction and the direction opposite to the forward direction, that is, the direction toward the opposite direction side of the moving direction corresponds to the rear direction.

A second housing 21 of the present invention is provided with a space therein and has waterproof performance. A second acoustic sensor is mounted on the inner or outer surface of the second housing 21, Like the first housing 11, it is preferable to include at least a curved surface and be formed of a low-density material.

The second acoustic sensor 22 of the present invention is installed on the inner or outer surface of the second housing 21 to collect sound waves, that is, leakage sound, And a sensor capable of detecting a sound wave occurring within a certain radius of a point where the sound source 10 is located.

According to a preferred embodiment, the second acoustic sensor 22 can be constituted by a microphone or a hydrophone in the same manner as the first acoustic sensor 12, in which case the microphone or the hydrophone And converts the generated sound waves into electric signals, thereby collecting sound signals according to the leakage. Hereinafter, an acoustic signal obtained by the second acoustic sensor 22 mounted on the second acoustic wave detecting device 20 will be referred to as a 'second acoustic signal S2'.

The second circuit unit 23 of the present invention includes a signal conversion unit for receiving an analog second sound signal collected through the second sound sensor 22 of the second sound wave detecting apparatus 20 and converting the analog second sound signal into a digital second sound signal And the signal conversion unit may be, for example, an A / D converter (Analog to Digital Converter).

The second data storage unit 24 of the present invention is configured to record and store the digital second sound signal converted by the second circuit unit 23, and may be any of an external memory or an internal memory.

1, the circuit part and the data storage part are physically separated from each other by the first sound wave detecting device 10 and the second sound wave detecting device 20 (i.e., the first circuit part 13 The first circuit unit 13 and the second circuit unit 23 are connected to one another via the first and second data storage units 14 and 24 and the second data storage unit 24, The first data storage unit 14 and the second data storage unit 24 may be configured as a single memory unit (hereinafter referred to as an 'integrated storage unit'), Of course.

In this case, the integrated circuit unit is mounted on any one of the first sound wave detecting device 10 and the second sound wave detecting device 20 so as to perform both the functions of the first circuit part 13 and the second circuit part 23 And the integrated storage unit may be mounted on any one of the first sound wave detecting device 10 and the second sound wave detecting device 20 to function as the first data storing unit 14 and the second data storing unit 24. [ Or both.

Also, the first data storage unit 14, the second data storage unit 24, or the integrated storage unit may be configured not to be mounted on the leak detector but to be mounted on a remote server remote from the leak detector Of course.

In this case, the first sound wave signal and the second sound wave signal, which are respectively collected by the first sound sensor 12 and the second sound sensor 22, are converted into digital signals and then transmitted to the signal reading unit 30, Or to be transmitted to a data storage unit mounted on a remote server so that data relating to the first sound signal S1 and the second sound signal S2 are recorded and stored in the remote server data storage unit .

Therefore, in accordance with such a configuration, the first sound wave detecting device 10 or the second sound wave detecting device 20 of the present invention is equipped with a communication module capable of wired or wireless communication.

1, a first communication module 15 capable of performing wired or wireless communication is mounted on the first sound wave detecting device 10, and a second communication module 15 (second communication module) capable of performing wired or wireless communication is mounted on the second sound wave detecting device 20. [ It is also possible to install one communication module in the first sound wave detecting device 10 or the second sound wave detecting device 20 so that the first sound signal S1 and the second sound signal And to transmit the acoustic signal S2 to the remote signal reading unit 30. [

The first acoustic signal S1 and the second acoustic signal S2 collected by the first acoustic sensor 12 and the second acoustic sensor 22 may be input to a preamplifier So that the frequency can be amplified.

The space holding member 40 of the present invention is constructed such that the first sound wave detecting device 10 and the second sound wave detecting device 20 are connected to each other so that the first sound wave detecting device 10 and the second sound wave detecting device 20 are connected to each other by a pipe So that the first sound wave detecting device 10 and the second sound wave detecting device 20 are spaced apart from each other.

According to the preferred embodiment, one end of the gap holding member 40 is connected and fixed to the first sound wave detecting device 10, the other end is connected and fixed to the first sound wave detecting device 10, And a bar-like member arranged so as to have a long axis in the moving direction of the device 10 and the second sound wave detecting device 20. [

The second sound wave detecting device 20 can be moved along the first sound wave detecting device 10 while keeping a predetermined distance behind the first sound wave detecting device 10, The first sound wave detecting device 10 and the second sound wave detecting device 20 do not change their arrangement positions in a variety of environments such as a fluid flow or a change in flow velocity or a channel width at the time of movement, So that it can move along the pipeline and detect leak-related information.

The signal reading section 30 of the present invention is provided with a first sound signal S1 collected by the first sound wave detecting device 10 and a second sound signal S1 collected by the second sound wave detecting device 20 And the second acoustic signals S2 to be collected are compared with each other.

According to a preferred embodiment, the signal reading unit 30 may be configured in the form of a computer or a remote server disposed at a remote site. However, the signal reading unit 30 may be installed in the first sound wave detecting apparatus 10 or the second sound wave detecting apparatus 20, And the second acoustic signals S1 and S2 to store the read result in the data storage unit or transmit the read result to the remote server in real time.

The comparison process performed by the signal reading unit 30 is a process for detecting a phase difference inversion between the first sound signal S1 and the second sound signal S2 and a process for detecting the phase difference inversion between the first sound signal S1 and the second sound signal S2. And a process for comparing the magnitude between the sound pressure of the first sound signal S1 and the sound pressure of the second sound signal S2, and (3) a process for comparing the magnitude between the sound pressure of the first sound signal S1 and the sound pressure of the second sound signal S2.

In this case, the leak-related information (i.e., leakage occurrence and its position) of the pipeline can be detected through the comparison processing of the signal reading unit 30. In this case, (30), but it is needless to say that the signal reading unit (30) may be replaced by an operator.

For example, when the subject is the signal reading unit 30, the signal reading unit 30 calculates phase difference inversion information, sound pressure difference information, or sound pressure information through the above comparison process, And provide the detected information to the operator.

If the subject is a worker, the signal reading unit 30 calculates phase difference inversion information, sound pressure difference information, or sound pressure information to be described later through the comparison process, and provides the information to the operator. And to detect the leakage and its position.

The water leakage detection device of the present invention may further include position detection means capable of detecting the movement distance or position information of the first sound wave detection device 10 or the second sound wave detection device 20 in the duct.

In this case, the detection of the first sound signal S1 or the second sound signal S2 by the first sound wave detecting device 10 or the second sound wave detecting device 20 simultaneously detects the first sound wave (Or positional information) of the detecting device 10 or the second sound wave detecting device 20 are acquired, and the moving distance (or the positional information) is matched with the acoustic signal collected by moving the duct, Or transmitted to the remote server or the signal reading unit 30 in real time.

For example, the position detection means may include an optical odometer for obtaining the travel distance of the leak detection device, and a wire ohmmeter for measuring the released distance of the wire connected to the leak detection device by supplementing or replacing the optical odometer .

Hereinafter, a method of detecting leakage-related information based on the comparison processing operation performed by the signal reading unit 30 and information obtained thereby will be described in detail. For reference, it is presumed that the subject which finally detects the leakage-related information is constituted by the signal reading unit 30.

&Lt; Example 1 >

The comparison process performed by the signal reading section 30 is a process for detecting the phase difference inversion between the first sound signal S1 and the second sound signal S2.

In this case, the signal reading unit 30 analyzes the phase difference between the first sound signal S1 and the second sound signal S2, and determines that leakage occurs at a position corresponding to the time point at which the phase difference inversion occurs .

FIG. 3 (a) is a schematic view showing a state before the water leakage point L1 of the leakage detection device according to the present invention passes, and FIG. 3 (b) FIG. 4A is a schematic view showing a state after passing the water leakage point L1 of the water leakage detection apparatus according to the present invention, and FIG. 4B is a graph showing the waveform of the second sound signal, and FIG. 5B is a graph showing the waveforms of the first acoustic signal and the second acoustic signal collected in the state of FIG.

3 to 4, when the water leakage point L1 is located in the front area of the first sound wave detecting device 10 with respect to the first direction K1, Is first reached to the first sound wave detecting device 10 due to the separation distance provided between the first sound wave detecting device 10 and the second sound wave detecting device 20 and then reaches the second sound wave detecting device 20 .

As a result, a time lag occurs between the point at which the leak sound first reaches the first sound wave detecting device 10 and the point at which the leak sound first reaches the second sound wave detecting device 20, and eventually the first sound wave detecting device The phase of the sound wave collected by the second sound wave detector 10 is higher than the phase of the sound wave collected by the second sound wave detector 20 so that the difference between the first sound signal S1 and the second sound signal S2 (b) is generated.

Thereafter, when the first sound wave detecting device 10 and the second sound wave detecting device 20 are moved along the channel 1 while passing through the water leakage point L1 while maintaining the separation distance, A phase difference opposite to the phase difference before passing the leak point L1, that is, a phase difference inversion occurs.

4 (a), in contrast to the case before passing through the water leakage point L1, the sound waves due to the water leakage are detected by the second sound wave detecting device 20 and the second sound wave detecting device 20, The first sound wave detecting device 10 is first reached to the second sound wave detecting device 20 due to the distance between the sound wave detecting devices 10.

As a result, a time lag occurs between the point at which the leak sound initially reaches the second sound wave detecting apparatus 20 and the point at which the leak sound first reaches the first sound wave detecting apparatus 10, The phase of the sound wave collected by the second sound wave detecting device 20 is higher than the phase of the sound wave collected by the first sound wave detecting device 10 so that the second sound signal S2 and the first sound In contrast to the case of FIG. 3, the phase difference inversion occurs between the signals S1 and S1.

On the other hand, when the water leakage detection device is moved along the pipeline 1 and is located on the water leakage point L1, more specifically, when the water leakage detection device is located at the center portion between the first sound wave detection device 10 and the second sound wave detection device 20 The sound waves due to the leakage reach the first sound wave detecting device 10 and the second sound wave detecting device 20 at the same time.

Therefore, in such a case, the phase of the sound wave collected by the first sound wave detecting apparatus 10 coincides with the phase of the sound wave collected by the second sound wave detecting apparatus 20.

As a result, according to the present invention, it is possible to acquire different phase difference information depending on a point of time after passing through the water leakage point L1, passing through the leak point L1, and passing through the leak point L1, It is possible to grasp the point where the leakage occurs.

As described above, the phase difference values according to the time points before, during, and after the water leakage point L1 of the water leakage detection apparatus are graphically expressed by the phase difference change characteristics according to the relative positions of the water leakage detection apparatus, .

FIG. 5 is a graph showing a phase difference value according to a point of time before, during, and after a water leakage point L1 of the water leakage detection apparatus according to the present invention. The 'X axis' The center C indicates the position on the water leakage point L1 of the water leakage detection device and the left area C indicates the position before the water leakage detection point L1 of the water leakage detection device And the rear region means the position after passing the leak point (L1) of the leak detection device. The 'Y axis' is a phase difference value between the first sound signal S1 and the second sound signal S2 according to the relative position of the water leakage detecting device, and the phase difference value of the upper region with respect to the center is positive (+) The lower region indicates a positive (-) phase difference value, and the center (C) indicates that a retardation value indicates zero (0).

As described above, when the leak point L1 is located in the front area of the first sound wave detecting device 10 with respect to the first direction K1, the first sound signal S1 and the second sound signal S1 The phase difference between the two sound signals S2 has a positive value so that the signal reading unit 30 can detect that the water leakage point L1 of the channel 1 is in the first direction K1 with respect to the first direction K1, It can be judged that it is located in the front area of the detection device 10. [

When the water leakage point L1 is located in the rear area of the first sound wave detecting apparatus 10 with respect to the first direction K1 as shown in the graph of FIG. 5, the first sound signal S1 and the second sound The phase difference between the signals S2 has a negative value so that the signal reading unit 30 detects that the water leakage point L1 of the channel 1 is in the first direction K1, It can be judged that it is located in the rear region of the vehicle 20.

In addition, the signal reading unit 30 detects the phase difference inversion in which the phase difference value between the first sound signal S1 and the second sound signal S2 is reversed from the positive value interval to the negative value interval according to the reading process described above, It is possible to judge that leakage has occurred at the pipeline position corresponding to the time point when the phase difference reversal occurs.

As a result, according to the leakage detection apparatus of the present invention, the phase difference inversion can be detected by calculating the positive value interval, the negative value interval and the zero point of time of the phase difference between the collected first and second acoustic signals, It is possible to track the relative position of the water leakage point (i.e., the front and rear of the water leakage detection device) according to the movement position of the apparatus, and to detect the water leakage point.

&Lt; Example 2 >

The comparison process performed by the signal reading section 30 is a process for detecting the negative pressure difference inversion between the first sound signal S1 and the second sound signal S2.

In this case, the signal reading unit 30 analyzes the sound pressure difference between the first sound signal S1 and the second sound signal S2, and judges that leakage is occurring at a position corresponding to the time point at which the phase difference reversal occurs do.

More specifically, first, when the water leakage point L1 is located in the front area of the first sound wave detecting apparatus 10 with respect to the first direction K1 as shown in FIG. 3 (a) The first sound wave detecting device 10 is always closer to the sound source (that is, the leakage sound) than the second sound wave detecting device 20 because of the separation distance provided between the device 10 and the second sound wave detecting device 20. [ Position.

Accordingly, the sound pressure sensed by the first sound wave detecting device 10 closer to the sound source (leakage sound) becomes larger than the sound pressure sensed by the second sound wave detecting device 20, and eventually the first sound signal S1 ) And the second sound signal S2 has a positive (+) value.

Thereafter, when the first sound wave detecting device 10 and the second sound wave detecting device 20 move along the channel 1 while passing through the water leakage point L1 while maintaining the separation distance, a negative pressure difference inversion occurs .

4 (a), the second sound wave detecting device 20 is always in the first sound wave detecting device 20, as opposed to the case where the leak detecting device is before the water leakage point L1, (I.e., leakage sound) than the sound source 10 (i.e., leakage sound).

Accordingly, the sound pressure sensed by the first sound wave detecting device 10 closer to the sound source (leakage sound) becomes smaller than the sound pressure sensed by the second sound wave detecting device 20, and eventually the first sound signal S1 ) And the second sound signal S2 becomes negative (+).

As a result, according to the present invention, it is possible to acquire different sound pressure difference information depending on the point of time before and after the water leak detection device passes through the water leakage point L1, and by extracting the time point at which the sound pressure difference is inverted from the obtained sound pressure difference information, The point of origin can be grasped.

Therefore, in accordance with the second embodiment, the signal reading unit 30 is configured such that when the difference in sound pressure between the first sound signal S1 and the second sound signal S2 is a positive value, When the difference between the first sound signal S1 and the second sound signal S2 is a negative value, it is determined that the first sound signal S1 and the second sound signal S2 are located in the front area of the first sound wave detector 10 on the basis of the first direction K1, 1 is located in the rear area of the second sound wave detecting device 20 with respect to the first direction K1.

On the other hand, due to the difference in the fine performance of the first acoustic sensor 12 and the second acoustic sensor 22, the first acoustic sensor 12 and the second acoustic sensor 22 are spaced the same distance (Hereinafter, referred to as a 'sound pressure difference waveform') is compensated for by the difference, the sound pressure difference inversion (that is, a positive Value to negative value) can be configured to appear.

If the sensing performance of the second acoustic sensor 22 is lower than that of the first acoustic sensor 12 by '0.9 dB' on the assumption that the 'compensation of any one acoustic sensor' is, for example, the same distance from the sound source, There may be a compensation method that level shifts the sound pressure difference waveform by a difference of '0.9 dB'.

&Lt; Example 3 >

The comparison process performed by the signal reading section 30 is a process of comparing the magnitude between the negative pressure of the first acoustic signal S1 and the negative pressure of the second acoustic signal S2.

Accordingly, the sound pressure sensed by the first sound wave detecting device 10 closer to the sound source (leakage sound) is measured to be larger than the sound pressure sensed by the second sound wave detecting device 20. [

When the first sound wave detecting device 10 and the second sound wave detecting device 20 move along the channel 1 while passing through the water leakage point L1 while maintaining the distance between the first sound wave detecting device 10 and the second sound wave detecting device 20, do.

Thereby, a reversal occurs in which the sound pressure sensed by the second sound wave detecting device 20 closer to the sound source (leakage sound) is measured to be larger than the sound pressure sensed by the first sound wave detecting device 10.

As a result, according to the present invention, it is possible to obtain the sound pressure magnitude information between the first sound signal S1 and the second sound signal S2 which are mutually opposite with respect to the time point before and after the water leak detection device passes through the water leakage point L1 .

Therefore, according to the third embodiment, when the sound pressure of the first sound signal S1 is larger than the sound pressure of the second sound signal S2, the signal reading unit 30 detects the leak point L1 of the channel 1 When the sound pressure of the first sound signal S1 is smaller than the sound pressure of the second sound signal S2, it is determined that the first sound signal S1 is located in the front area of the first sound wave detecting device 10 with respect to the first direction K1, It is determined that the water leakage point L1 of the channel 1 is located in the rear area of the second sound wave detecting device 20 with respect to the first direction K1.

On the other hand, also in the case of the third embodiment, as in the second embodiment, due to the difference in the fine performance in the sound pressure measurement between the first acoustic sensor 12 and the second acoustic sensor 22, A different sound pressure can be measured even if the two acoustic sensors 22 are at the same distance from the sound source.

In this case, it is possible to arrange to detect the leak-related information through the reversal point of the sound pressure magnitude by compensating the sound pressure difference waveform by the difference as described in the second embodiment.

While the preferred embodiments of the present invention have been described and illustrated above using specific terms, such terms are used only for the purpose of clarifying the invention, and it is to be understood that the embodiment It will be obvious that various changes and modifications can be made without departing from the spirit and scope of the invention. Such modified embodiments should not be understood individually from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.

10: first sound wave detecting device 12: first sound sensor
20: second sound wave detecting device 22: second sound sensor
30: signal reading section 40: gap holding member
S1: first sound signal S2: second sound signal
K1: first direction L1: leak point

Claims

A first sound wave detecting device mounted on a first acoustic sensor that moves along the inside of the duct and detects a sound wave generated by a leak of the duct;
Is disposed in a rear area of the first sound wave detecting device at a distance from the first sound wave detecting device with reference to a moving direction of the first sound wave detecting device (hereinafter referred to as a 'first direction'), A first sound wave detecting device mounted with a second sound sensor for holding a state spaced apart from the detecting device and moving in the first direction together with the first sound wave detecting device and detecting a sound wave generated by water leakage of the channel; And
A signal reading step of performing a mutual comparison process of a first sound signal collected by the first sound wave detecting device and a second sound signal collected by the second sound wave detecting device so as to detect leak- Wherein the water leakage detection unit detects the water leakage.

The method according to claim 1,
Wherein the first sound wave detecting device includes a first housing on which the first acoustic sensor is mounted,
Wherein the second sound wave detecting device includes a first housing on which the second acoustic sensor is mounted,
Further comprising a gap holding member that interconnects the first housing and the second housing to function to keep the second sound wave detecting apparatus constantly spaced from the first sound wave detecting apparatus to the rear region, Wherein the water leakage detection device comprises:

The method according to claim 1,
Wherein the comparison processing of the signal reading unit includes processing for detecting a phase difference inversion between the first acoustic signal and the second acoustic signal.

The method of claim 3,
Wherein the signal reading unit determines that a leakage point of the channel exists at a channel position corresponding to a time point at which the phase difference inversion occurs between the first sound signal and the second sound signal.

The method of claim 3,
Wherein the process for detecting the phase difference reversal includes a process of calculating a positive value interval and a negative value interval of a phase difference between the first sound signal and the second sound signal.

6. The method of claim 5,
Wherein the signal reading unit comprises:
When the phase difference between the first sound signal and the second sound signal is a positive value, it is determined that the water leakage point of the channel is located in the front region of the first sound wave detecting device with respect to the first direction,
When the phase difference between the first sound signal and the second sound signal is a negative value, determines that the leak point of the channel is located in the rear region of the second sound wave detecting device with respect to the first direction. Detector.

The method according to claim 6,
Wherein the signal reading unit comprises:
When the phase difference between the first sound signal and the second sound signal is zero, it is determined that the water leakage point of the channel is located on the central portion between the first sound wave detecting device and the second sound wave detecting device Wherein the water leakage detection device comprises:

The method according to claim 1,
Wherein the comparison processing of the signal reading section includes processing for detecting a difference in the sound pressure difference between the first acoustic signal and the second acoustic signal.

9. The method of claim 8,
Wherein the signal reading unit determines that a leakage point of the pipeline exists at a pipeline position corresponding to a time point at which the negative pressure difference inversion occurs between the first and second acoustic signals.

9. The method of claim 8,
Wherein the process for detecting the negative pressure difference inversion includes a process of calculating a positive value interval and a negative value interval of a sound pressure difference between the first sound signal and the second sound signal.

11. The method of claim 10,
Wherein the signal reading unit comprises:
Determining that a leakage point of the pipeline is located in a front region of the first sound wave detecting apparatus with respect to the first direction when the difference in sound pressure between the first sound signal and the second sound signal is a positive value,
Wherein when the pressure difference between the first sound signal and the second sound signal is a negative value, it determines that the water leakage point of the channel is located in the rear area of the second sound wave detecting device with respect to the first direction. Detector.

The method according to claim 1,
Wherein the comparing process of the signal reading unit includes a process of comparing the magnitude between the negative pressure of the first acoustic signal and the negative pressure of the second acoustic signal.

13. The method of claim 12,
Wherein the signal reading unit comprises:
When the sound pressure of the first sound signal is greater than the sound pressure of the second sound signal, it is determined that the leak point of the channel is located in the front area of the first sound wave detecting device with respect to the first direction,
When the sound pressure of the first sound signal is smaller than the sound pressure of the second sound signal, it is determined that the water leakage point of the channel is located in the rear area of the second sound wave detecting device with respect to the first direction Leak detection system.

The method according to claim 1,
Further comprising position detecting means for detecting movement distance or position information of the first sound wave detecting device or the second sound wave detecting device in the duct.