KR101640894B1 - Water leak sensor and water leak sensing method using the same - Google Patents

Water leak sensor and water leak sensing method using the same Download PDF

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Publication number
KR101640894B1
KR101640894B1 KR1020150135480A KR20150135480A KR101640894B1 KR 101640894 B1 KR101640894 B1 KR 101640894B1 KR 1020150135480 A KR1020150135480 A KR 1020150135480A KR 20150135480 A KR20150135480 A KR 20150135480A KR 101640894 B1 KR101640894 B1 KR 101640894B1
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KR
South Korea
Prior art keywords
leakage
unit
sensor
frequency
data
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Application number
KR1020150135480A
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Korean (ko)
Inventor
박연종
강지헌
엄두섭
Original Assignee
에스케이건설 주식회사
주식회사 센서웨이
서울특별시(상수도사업본부장)
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Priority to KR1020150135480A priority Critical patent/KR101640894B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
    • G01M3/243—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations for pipes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration

Abstract

The present invention relates to a water leakage sensor to sense a water leakage and a water leakage sensing method by analyzing frequency areas of elastic waves caused by the leakage of water. The water leakage sensor comprises: a sensor unit to collect data on leakages based on the elastic waves; a converting unit to convert the data on the leakages, outputted from the sensor unit, into digital signals; a processing unit to determine whether there is a leakage by analyzing the digital signals inputted from the converting unit in the corresponding frequency areas; and a communication unit to transmit information about whether there is a leakage, inputted by the processing unit, to an external communications device. As such, in accordance with the present invention, whether a leakage is present is able to easily be checked using the elastic waves.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water leakage sensor,

An embodiment of the present invention relates to a leakage sensor for detecting an elastic wave generated by leakage of a water pipe, and a leakage detection method using the leakage sensor.

Generally, water pipes are embedded in underground and used to supply water to various buildings. The water pipe is liable to cause cracks due to shrinkage and expansion due to corrosion, impact from the outside, and sudden temperature change, but it is difficult to confirm cracks easily because it is buried in the underground. It is difficult to precisely confirm the position of the leakage of the water.

Disclosure of Invention Technical Problem [8] The present invention provides a water leakage sensor that can easily detect water leakage using elastic waves, and a leakage detection method using the same.

The leakage sensor of the embodiment of the present invention includes a sensor unit for collecting leakage data in an elastic wave form; A conversion unit for converting leakage data output from the sensor unit into a digital signal; A processing unit for analyzing the digital signal input from the conversion unit into a frequency domain to determine whether or not to leak the digital signal; And a communication unit for transmitting the leaked water inputted from the processing unit to an external communication device.

The processor analyzes the digital signal in a frequency domain through Fast Fourier Transform (FFT).

The processing unit extracts a fundamental frequency of the leakage data and a magnitude of the fundamental frequency.

The processor compares the magnitude of the fundamental frequency and the magnitude of the fundamental frequency with a predetermined leak determination criterion.

The leakage determination criterion is adjusted according to the type of leakage, the amount of water leakage, and the type of water pipe.

The leakage determination criterion is set by the external communication device and input through the communication unit.

The sensor unit includes an acceleration sensor.

According to another aspect of the present invention, there is provided a leakage detection method including: a sensor unit collecting leakage data in an elastic wave form; Converting the leakage data output from the sensor unit into a digital signal; Analyzing the digital signal input from the conversion unit in the frequency domain to determine whether leakage occurs; And transmitting the leaked data inputted from the processing unit to the external communication device.

Before extracting the fundamental frequency of the leakage data and the magnitude of the fundamental frequency, removing the noise of the leakage data.

The leakage sensor of the present invention and the leakage detection method using the leakage sensor of the present invention can detect an elastic wave type leakage signal transmitted along the water pipe when the leakage occurs in the water pipe. The leakage frequency can be accurately and easily judged by comparing the frequency of the fundamental frequency and the fundamental frequency of the elastic wave type leakage signal detected by the Fast Fourier Transform (FFT) with predetermined conditions.

1 is a sectional view of a water leakage sensor according to an embodiment of the present invention.
2 is a conceptual diagram showing a leakage detection method according to an embodiment of the present invention.
3 is a flowchart of frequency analysis.
FIGS. 4A and 4B are frequency graphs according to leaks. FIG.
5 is a cross-sectional view showing an application example of the leak sensor of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

Hereinafter, a leakage sensor and a leakage detection method using the leakage sensor will be described in detail with reference to the accompanying drawings.

1 is a sectional view of a water leakage sensor according to an embodiment of the present invention.

1, the water leakage sensor 100 according to the embodiment of the present invention includes a sensor unit 105, a conversion unit 110, a processing unit 115, a battery unit 120, and a communication unit 125, The conversion unit 110, the processing unit 115, the battery unit 120, and the communication unit 125 are disposed in the housing 130.

The sensor unit 105 measures an elastic wave signal transmitted through the water pipe. Specifically, when water leakage occurs in the water pipe due to cracks in the water pipe, leakage water leak data is transmitted in an elastic wave form. The sensor unit 105 converts the elastic wave transmitted through the water pipe into an electrical signal and transmits the electrical signal to the conversion unit 110. Particularly, the sensor unit 105 preferably includes an acceleration sensor having an excellent low-frequency characteristic as compared with an acoustic emission sensor (AES).

The conversion unit 110 is an analog-to-digital converter (ADC) that converts an electrical signal output from the sensor unit 105 into a digital signal. In this case, the converter 110 preferably provides a sampling rate of 2 KHz or more so as to analyze the minimum 1 KHz signal. This is because the frequency range of the leak sound transmitted through the water pipe is generally within 1 KHz.

The processing unit 115 can determine whether or not the leaked water is leaked through the frequency analysis of the acoustic wave signal converted into the digital signal by the converting unit 110. The processing unit 115 is a micro-controller unit (MCU), and processes the digital signal converted from the conversion unit 110. [

The communication unit 125 includes a communication module and an antenna 125a for the leak sensor 100 connected to the water pipe to communicate with a ground external communication device such as a wireless terminal. At this time, the communication module may be disposed in the housing 130, and the antenna 125a may be connected to the communication module and exposed to the outside of the housing 130.

Particularly, since the water leakage sensor 100 is disposed adjacent to the water pipe, the water leakage sensor 100 is also buried in the ground, so that the communication sensitivity with the external communication device may be reduced. Therefore, in order to prevent this, the communication unit 125 preferably includes a communication module capable of low frequency communication within 200 MHz.

The battery unit 120 supplies power to the water leakage sensor 100. The leak sensor 100 may be activated only for a predetermined time or may be activated or deactivated under the control of an external communication device in order to minimize consumption current due to the nature of the leak sensor 100 operated by a battery.

Hereinafter, a leakage detection method according to an embodiment of the present invention will be described in detail.

2 is a conceptual diagram showing a leakage detection method according to an embodiment of the present invention.

2, the processing unit 115 selects a deactivation mode and an activation mode according to a control signal received from a time information (RTC) built in the processing unit 115 or an external communication device 135. [

For example, when the processing unit 115 selects the deactivation mode, the processing unit 115 operates in the low power mode in order to prevent power consumption of the leak sensor 100. [ The current consumed by turning off the power of the converting unit 1100 and the communication unit 125 can be minimized.

When the processing unit 115 selects the activation mode, the acoustic wave signal acquired from the sensor unit 105 is converted into a digital signal by the conversion unit 110. [ The processing unit 115 analyzes the digital signal in the frequency domain through Fast Fourier Transform (FFT). Next, it is determined whether or not the component in the frequency domain corresponds to a leak or not. Then, information on leakage presence / absence is transmitted to the external communication device 135 through the communication unit 125. [

Hereinafter, a method of analyzing the digital signal in the frequency domain by the processor 115 will be described in detail.

3 is a flowchart of frequency analysis.

3, leakage data is collected by the sensor unit 105 (S100). At this time, the leakage data y (t) includes leakage signals x (t) and other noise signals d (t), which leak sound transmitted in an elastic wave form. Subsequently, the noise signal d '(t) is primarily removed by using a band pass filter (BPF) (S105).

Next, the leakage signal is analyzed (S110) through Fast Fourier Transform (FFT) to extract the fundamental frequency Xk (n) of the leakage signal and the amplitude (Amplitude) of the fundamental frequency. Then, the magnitude A of the fundamental frequency Xk (n) and the fundamental frequency Xk (n) is compared with predetermined conditions (S115 and S120).

Specifically, when the fundamental frequency Xk (n) is included in the leak frequency region of the first frequency freq1 to the second frequency freq2, it is determined that a leak has occurred. Further, when the magnitude (A) of the fundamental frequency (Xk (n)) is larger than the magnitude of the leak frequency of Ref Amp, it is judged that a leak has occurred.

FIGS. 4A and 4B are frequency graphs according to leaks. FIG.

FIGS. 4A and 4B are frequency graphs according to leaks when the leakage frequency range is from 900 Hz to 1100 Hz. The leakage frequency region can be easily changed according to characteristics such as the type of leakage water, the amount of water leakage, the type of water pipe, and the like in the area where the water leakage sensor 100 is installed and operated. In addition, the leak frequency region can be set by the external communication device 135 and input and stored through the communication unit 125. [

For example, in the case of a cast iron pipe having a water pipe of 150 mm, a frequency region of 900 Hz to 1100 Hz is set as a leak frequency region, and a frequency region of 700 Hz to 900 Hz is set as a leak frequency region when the water pipe is a 100 mm cast iron pipe. In the case of a 50 mm PVC pipe, the frequency range of 200 Hz to 300 Hz is set as the leaked frequency range.

4A, the signal is detected only in the frequency range of 600 Hz to 700 Hz as a result of analyzing the fundamental frequency Xk (n) of the leakage signal. On the other hand, in the case of FIG. 4B, it is confirmed that signals are detected not only in the frequency range of 600 Hz to 700 Hz, but also in the frequency range of 900 Hz to 1100 Hz.

4A and 4B, the leakage sensor of the present invention and the leakage detection method using the leakage sensor analyze the fundamental frequency Xk (n) through Fast Fourier Transform (FFT) .

Particularly, it is possible not only to include the fundamental frequency Xk (n) described above in the leakage frequency region, but also to determine whether or not the maximum signal amplitude A in the frequency region is within a set condition.

For example, as shown in FIG. 4B, when a signal is detected in the frequency range of 900 Hz to 1100 Hz and the signal size A is 0.2 or more, Can be improved.

The leak sensor 100 and the leak detection method of the present invention as described above can detect the fundamental frequency Xk (n) and the fundamental frequency Xk (n) of an elastic wave type leak signal through Fast Fourier Transform n) can be easily and accurately judged by comparing the size (A) of the nipple with the predetermined condition.

5 is a cross-sectional view showing an application example of the leak sensor of the present invention.

As shown in FIG. 5, the water leakage sensor 100 is connected to the water pipe 1000. The water pipes 1000 are connected to each other through a connection part 1100. The water leakage sensor 100 may be fixed to the water pipe 1000, the connection part 1100 and the water drain valve 1200, and the water leakage sensor 100 is connected to the water drain valve 1200 in the drawing.

The water leakage sensor 100 can be connected to the water drainage valve 1200 in an area formed in the manhole 1300 in which the installation space is ensured and the water leakage sensor 100 can be connected to the water discharge valve 1200 through a magnet attached to the outside of the housing 130 The water pipe 100 can be easily detached and attached from the adjacent water pipe 1000, the connecting portion 1100 and the water drain valve 1200. When the water leakage sensor 100 is attached to the water pipe 100 through the magnet, desirable.

The water leakage sensor 100 detects an elastic wave leakage signal transmitted along the water pipe 1000 when water leakage occurs due to cracking of the water pipe 1000 and outputs a leak signal in the form of a Fast Fourier Transform (A) of the fundamental frequency (Xk (n)) and the fundamental frequency (Xk (n)) of the leaky signal of the elastic wave form through the Fourier Transform (FFT) can do. The leakage information can be transmitted to the external communication device 135 through the communication unit 125. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge.

100: leak sensor 105: sensor part
110: conversion unit 115:
120 battery unit 125 communication unit
125a: antenna 130: housing
135: External communication device 1000: Water pipe
1100: Piping connection part 1200: Drain valve
1300: Manhole

Claims (13)

A sensor unit for collecting leakage data in an elastic wave form;
A conversion unit for converting leakage data output from the sensor unit into a digital signal;
A processing unit for analyzing the digital signal input from the conversion unit into a frequency domain to determine whether or not to leak the digital signal; And
And a communication unit for transmitting the leaked data inputted from the processing unit to an external communication device,
The processor analyzes the digital signal in a frequency domain through Fast Fourier Transform (FFT)
Extracting a basic frequency of the leakage data and a magnitude of the fundamental frequency and comparing the magnitudes of the fundamental frequency and the fundamental frequency with a leakage determination criterion set differently according to the type of leakage, Leak sensor. The method according to claim 1,
Wherein the leakage determination criterion is set by the external communication device and input through the communication unit. delete delete delete delete The method according to claim 1,
Wherein the sensor unit includes an acceleration sensor. Collecting leaking data in the form of an acoustic wave;
Converting the leakage data output from the sensor unit into a digital signal;
Analyzing the digital signal input from the converting unit into a frequency domain through Fast Fourier Transform (FFT);
Wherein the leakage frequency data and the leakage frequency data are analyzed in the frequency domain by extracting a fundamental frequency of the leakage data and a magnitude of the fundamental frequency, Determining whether or not the leak is compared with a judgment criterion; And
And communicating whether or not the communication unit is leaking from the processing unit to an external communication device. 9. The method of claim 8,
Wherein the leakage determination criterion is set by the external communication device and input through the communication unit. delete delete delete 9. The method of claim 8,
Further comprising the step of removing noise of the leakage data before extracting the fundamental frequency of the leakage data and the magnitude of the fundamental frequency.
KR1020150135480A 2015-09-24 2015-09-24 Water leak sensor and water leak sensing method using the same KR101640894B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220087897A (en) * 2020-12-18 2022-06-27 주식회사 뉴보텍 Movable moisture removal apparatus for rehabilitation of non-excavated pipelines
KR102572640B1 (en) 2023-07-13 2023-09-01 주식회사 유솔 Method of detecting location of water leakage in water pipe, and Method of determining and processing water leakage level in water pipe using the method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11237234A (en) * 1997-12-05 1999-08-31 Osaka Gas Co Ltd Piping inspection method and inspection device
KR101447925B1 (en) * 2013-08-22 2014-10-08 주식회사 엘지씨엔에스 Leakage signal analysis method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11237234A (en) * 1997-12-05 1999-08-31 Osaka Gas Co Ltd Piping inspection method and inspection device
KR101447925B1 (en) * 2013-08-22 2014-10-08 주식회사 엘지씨엔에스 Leakage signal analysis method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220087897A (en) * 2020-12-18 2022-06-27 주식회사 뉴보텍 Movable moisture removal apparatus for rehabilitation of non-excavated pipelines
KR102478494B1 (en) 2020-12-18 2022-12-19 주식회사 뉴보텍 Movable moisture removal apparatus for rehabilitation of non-excavated pipelines
KR102572640B1 (en) 2023-07-13 2023-09-01 주식회사 유솔 Method of detecting location of water leakage in water pipe, and Method of determining and processing water leakage level in water pipe using the method

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