KR101757262B1 - System for detecting water leakage using 2 channel fiber-optic temperature sensor - Google Patents

System for detecting water leakage using 2 channel fiber-optic temperature sensor Download PDF

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KR101757262B1
KR101757262B1 KR1020150179158A KR20150179158A KR101757262B1 KR 101757262 B1 KR101757262 B1 KR 101757262B1 KR 1020150179158 A KR1020150179158 A KR 1020150179158A KR 20150179158 A KR20150179158 A KR 20150179158A KR 101757262 B1 KR101757262 B1 KR 101757262B1
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temperature
optical fiber
fiber line
measurement point
temperature measurement
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KR1020150179158A
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Korean (ko)
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KR20170071161A (en
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남용일
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(주)성삼
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • 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
    • G01M3/38—Investigating fluid-tightness of structures by using light
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/20—Status alarms responsive to moisture

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

Provides technology that can detect water leaks at low and precise locations where rivers and water are stored, and provides technology that can detect leak points with a very accurate probability based on surrounding environmental information. A water leakage detection system using a two-channel optical fiber temperature sensor according to an embodiment of the present invention is embedded in a bottom surface in contact with water in a place where water exists and is provided with light from a light source, At least one sensor for reflecting light of different wavelengths according to temperature is provided for each of at least one temperature measurement point; A second optical fiber line installed at a predetermined height from the water surface, wherein at least one sensor is installed for each of the at least one temperature measurement point; And analyzing wavelengths of light reflected from the sensors included in the first optical fiber line and the second optical fiber line to measure temperature information for each temperature measurement point, And a leak detection unit for detecting the leaked water.

Figure R1020150179158

Description

[0001] The present invention relates to a leakage detection system using a 2-channel optical fiber temperature sensor,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a technology for detecting leakage in a place where water such as a river exists by using an optical fiber temperature sensor for detecting a temperature by guiding a light flux including temperature information to a detector by an optical fiber, The present invention relates to a technique capable of accurately detecting a leakage point by detecting a change.

Water leakage is a serious problem in places where water such as rivers are present and where water such as reservoirs and dams are stored. Such water leaks are very difficult to visually identify due to the nature of the place where the water is stored, and accordingly, a sensor that detects leaks at a high cost is required to be installed in the entire area of the place. However, due to the installation cost of such a sensor, there are not many cases where a facility for detecting leakage is installed in a place where water exists.

Nowadays, water is recognized as an important resource, the loss of water due to leakage is a big economic problem. Therefore, studies on leakage detection technology are being conducted.

For example, in Korean Patent No. 1056056, safety management of a river revetment facility is performed on the basis of a displacement sensor, and a technology for sensing leakage, etc. is presented.

However, the above-mentioned conventional techniques have a limited range of application to hoisting facilities with very expensive installation costs as mentioned above, so that leakage from various parts such as leakage through the bottom of the river and leakage through other facilities There is a problem that is difficult to detect.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a technology capable of inexpensively and accurately detecting leakage of water, including rivers. In particular, it is an object of the present invention to provide a technology capable of detecting leakage points with a very accurate probability based on surrounding environmental information.

In order to achieve the above object, a water leakage detection system using a two-channel optical fiber temperature sensor according to an embodiment of the present invention includes a water leakage detection system embedded in a bottom surface in contact with water, At least one sensor for reflecting light of different wavelengths according to the temperature of the object to be measured from the incident light is provided for each at least one temperature measurement point; A second optical fiber line installed at a predetermined height from the water surface, the at least one sensor being installed at each of at least one temperature measurement point; And analyzing wavelengths of light reflected from the sensors included in the first optical fiber line and the second optical fiber line to measure temperature information for each temperature measurement point and measuring the temperature information of the at least one temperature measurement And a leakage detection unit for detecting whether or not the leakage occurs by point.

According to the present invention, it is possible to accurately detect leakage of water generated in a river bottom or the like from a temperature change amount through a simple construction in which an optical fiber line is buried underground, thereby enabling an inexpensive and accurate leak detection.

In particular, by applying a two-channel system of fiber optic lines measuring the reference temperature and fiber optic lines measuring the temperature at the time of temperature change, the temperature change can be accurately detected by the seasonal change and the temperature change, There is an effect of detecting leakage.

1 is a schematic diagram of a leakage detection system using a 2-channel optical fiber temperature sensor according to an embodiment of the present invention;
2 and 3 are views for explaining the flow of a function of detecting temperature and leakage using an optical fiber temperature sensor according to each embodiment of the present invention.

Hereinafter, a leakage detection system using a 2-channel optical fiber temperature sensor according to each embodiment of the present invention will be described with reference to the accompanying drawings.

The following examples are intended to illustrate the present invention and should not be construed as limiting the scope of the present invention. Accordingly, an equivalent invention performing the same function as the present invention is also within the scope of the present invention.

In addition, in adding reference numerals to the constituent elements of the drawings, it is to be noted that the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

In the embodiments of the present invention, " communication ", " communication network ", and " network " The three terms refer to wired and wireless local area and wide area data transmission and reception networks capable of transmitting and receiving a file between a user terminal, a terminal of another user, and a download server.

1 is a schematic block diagram of a leakage detection system using a two-channel optical fiber temperature sensor according to an embodiment of the present invention.

1, a leakage detection system using a two-channel optical fiber temperature sensor according to an embodiment of the present invention includes a first optical fiber line 20, a second optical fiber line 10, and a leak detection unit 40 .

The first optical fiber line 20 is embedded or installed on the bottom surface of the water 30 in contact with the water 30 at the location where the water 30 is present, and is provided with light from the light source 50, (Not shown) for reflecting at least one tube of different wavelengths according to the temperature of the object to be measured is provided for each of the at least one temperature measurement point 21.

In the present invention, the sensor means an optical fiber temperature sensor, and the light flux including the temperature information is guided to the detector by the optical fiber to detect the temperature. The temperature is detected by detecting the wavelength reflected by the temperature of the measured object as in the above example.

There are five types of optical fiber temperature sensors, infrared radiation detection type, semiconductor filter type (energy gap type), ferrite type (interference type), fluorescence intensity detection type, and optical path blocking type. The infrared radiation detection type induces the infrared rays emitted by the thermal vibration of the atoms constituting the material to the detector by the multimode optical fiber, and measures the temperature of the object from the intensity. The semiconductor filter type detects the temperature by a change in the intensity of light transmitted through the semiconductor by utilizing the fact that the semiconductor energy gap changes with temperature. GaAs, CdTe or the like is used as the semiconductor. The Fabry-Perot type interferes with light by coating a dielectric multilayer reflective film on both ends of the single mode fiber to create an optical fiber fabric ferroelectric. Whenever the optical length of a single-mode fiber changes by λ / 2 by temperature, a pulse of light appears and the temperature of the single-mode fiber or the temperature of the object in thermal equilibrium is detected by measuring the pulse of this light. The fluorescence intensity detection type detects fluorescence when a fluorescent substance immobilized on the tip of a multimode optical fiber is excited by ultraviolet rays, but the temperature is detected by using the fluorescence intensity depending on the temperature. The optical path blocking type detects the temperature by changing the intensity of light by inserting a temperature sensor (bimetal, magnetic ferrite, etc.) between the transmitting multimode optical fiber and the receiving multimode optical fiber to block the optical path. In addition to the above examples, all fiber optic temperature sensors may be used in the present invention.

The second optical fiber line 10 is installed at a predetermined height from the water surface and has the same sensor as the sensor installed in the first optical fiber line 20 installed at every one temperature measurement point 11.

The second optical fiber line 10 is configured to measure the reference temperature. When the temperature is measured at the temperature measurement point 11 in the first optical fiber line 20, the leakage of water is sensed based on the amount of change in temperature. The temperature of the object including the water 30 changes with time, Lt; / RTI > In this case, although the temperature change is a natural change, an error may be caused to determine that such a temperature change is caused by the leakage.

In order to prevent this, by installing the second optical fiber line 10 and setting the temperature measured at the second optical fiber line 10 to the reference temperature, leakage current is sensed with high accuracy considering the natural temperature change at the same time will be.

The first optical fiber line 20 and the second optical fiber line 10 are installed at the same position on the vertical line and the first optical fiber line 20 and the second optical fiber line 10 are installed at the same position, It is preferable that the temperature measurement points 21 and 11 set to the same position on the vertical line.

In order to perform the above function, the leakage sensing unit 40 collects the light reflected from the sensors included in the first optical fiber line 20 and the second optical fiber line 10 and analyzes the wavelength of the condensed light, Measures temperature information for each temperature measurement point (21, 11), and detects whether leakage has occurred for each temperature measurement point (21) using the measured temperature information.

Specifically, the leakage detection unit 40 detects whether or not the leakage occurs by performing functions corresponding to the two embodiments.

The leakage detection unit 40 detects the temperature measured at the temperature measurement point 11 of the second optical fiber line 10 and the temperature measured at the temperature measurement point 21 of the first optical fiber line 20 as the first example, (Not shown) when it is determined that a leak occurs at the temperature measurement point when the temperature information exceeds the predetermined first threshold value for each temperature measurement point 21, The leakage alarm signal can be transmitted to the user.

For example, water leaks from areas where leaks occur, resulting in a large difference from the temperature at the bottom of the water bottom as the measured object. Using this principle, it is detected that the temperature is leaking at a portion that is significantly higher or lower than the other temperature measurement points.

Meanwhile, as a second example, the leakage detection unit 40 may calculate a first average value which is an average value of temperature information which is the same information as the information calculated in the first example at a specific temperature measurement point for a predetermined period (for example, one day) Comparing the second average value, which is an average value of the temperature information at the temperature measurement points excluding the specific temperature measurement point, so that an error between the second average value and the first average value exceeds a predetermined second threshold value for each temperature measurement point , It is determined that leakage has occurred at the temperature measurement point, and an alarm signal can be sent to the administrator terminal.

The functions of the first and second examples are the same as those of the first example and the second example. In the second example, however, errors in the function of the first example can be further reduced by comparing the errors of the average values of the temperatures during a specific period.

According to this function, an inexpensive optical fiber line can be installed, and it is possible to accurately determine whether or not the leakage occurs by using the temperature difference between the object to be measured and the water 30 at the time of occurrence of leakage. Particularly, since the second optical fiber line 10 is installed for performing the function of measuring the reference temperature, it is possible to realize leakage detection with minimized error in consideration of a natural temperature change.

2 and 3 are views for explaining the flow of a function of detecting temperature and leakage using an optical fiber temperature sensor according to each embodiment of the present invention. In the following description, the description of the parts overlapping with those of FIG. 1 will be omitted.

2, temperatures (100, 200) at each temperature measurement point are measured using two channels of optical fiber temperature sensor lines of channel 1 (second optical fiber line) and channel 2 (first optical fiber line) . At this time, it is determined that leakage occurs in the portion 210 where the difference between the temperature 100 of the channel 1 and the temperature 200 of the channel 2 or the error of the average value exceeds the threshold value.

In this case, in order to further increase the accuracy, a hot line may be included as shown in FIG. The heat ray is installed between the channel 1 (the second optical fiber line) and the channel 2 (the first optical fiber line) to perform heat generation. Due to the presence of the hot line, the temperature (100, 200, 300) information in each channel and hot line will be measured and the hot line and channel 1 are applied together at the reference temperature, It can be determined that leakage occurs at the portion 210 where the error of the threshold value exceeds the threshold value.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program is stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing an embodiment of the present invention. As a storage medium of the computer program, a magnetic recording medium, an optical recording medium, or the like can be included.

It is also to be understood that the terms such as " comprises, " " comprising, " or " having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (5)

At least one sensor embedded in a bottom surface in contact with the water in contact with water and reflecting light of different wavelengths according to the temperature of the measured object from the light received from the light source, A first optical fiber line installed for each measurement point;
A second optical fiber line installed at a predetermined height from the water surface, the at least one sensor being installed at each of at least one temperature measurement point; And
Analyzing wavelengths of light reflected from sensors included in the first optical fiber line and the second optical fiber line to measure temperature information for each of the temperature measurement points, and using the measured temperature information, And a leakage detection unit for detecting whether or not the leakage occurs,
Wherein the first optical fiber line and the second optical fiber line are installed at the same position on a vertical line and the temperature measurement points included in the first optical fiber line and the second optical fiber line are located at the same position on a vertical line,
Wherein the temperature measured in the second optical fiber line is set to a reference temperature so that leak water can be detected with high accuracy considering the natural temperature change together. delete The method according to claim 1,
The leak detector
Calculating a difference between a temperature measured at a temperature measurement point of the second optical fiber line and a temperature measured at a temperature measurement point of the first optical fiber line as the temperature information, 1 < / RTI > threshold value, it is determined that leakage occurs at the temperature measurement point, and an alarm signal is sent to the administrator terminal. The method of claim 3,
The leak detector
A first average value which is an average value of the temperature information at a specific temperature measurement point for a predetermined period and a second average value which is an average value of the temperature information at the temperature measurement points excluding the specific temperature measurement point, And an alarm signal is sent to the administrator terminal when it is determined that a leak has occurred at the temperature measurement point when the error of the first average value exceeds a predetermined second threshold value for each temperature measurement point Leak detection system using temperature sensor. The method according to claim 1,
And a heat line provided between the first optical fiber line and the second optical fiber line to generate heat. 2. The leakage detection system using the two-channel optical fiber temperature sensor according to claim 1,
KR1020150179158A 2015-12-15 2015-12-15 System for detecting water leakage using 2 channel fiber-optic temperature sensor KR101757262B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071472A (en) * 2000-08-25 2002-03-08 Hitachi Ltd Optical fiber temperature measuring device and heating medium leakage detecting device
JP2003028979A (en) * 2001-07-13 2003-01-29 Hitachi Ltd Water leak detector
JP2009041229A (en) * 2007-08-07 2009-02-26 Ohbayashi Corp Water leakage monitoring system and water leakage detecting method for water sealing material, and impervious wall

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071472A (en) * 2000-08-25 2002-03-08 Hitachi Ltd Optical fiber temperature measuring device and heating medium leakage detecting device
JP2003028979A (en) * 2001-07-13 2003-01-29 Hitachi Ltd Water leak detector
JP2009041229A (en) * 2007-08-07 2009-02-26 Ohbayashi Corp Water leakage monitoring system and water leakage detecting method for water sealing material, and impervious wall

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