KR100913536B1 - System for monitering pipe using distributed optical fiber sensor - Google Patents

System for monitering pipe using distributed optical fiber sensor Download PDF

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Publication number
KR100913536B1
KR100913536B1 KR1020080116752A KR20080116752A KR100913536B1 KR 100913536 B1 KR100913536 B1 KR 100913536B1 KR 1020080116752 A KR1020080116752 A KR 1020080116752A KR 20080116752 A KR20080116752 A KR 20080116752A KR 100913536 B1 KR100913536 B1 KR 100913536B1
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KR
South Korea
Prior art keywords
pipe
optical fiber
strain
temperature
distributed
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Application number
KR1020080116752A
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Korean (ko)
Inventor
김유승
최준성
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한국유지관리 주식회사
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/16Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
    • G01D5/32Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35338Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
    • G01D5/35354Sensor working in reflection
    • G01D5/35358Sensor working in reflection using Backscattering to detect the measured quantity
    • G01D5/35364Sensor working in reflection using Backscattering to detect the measured quantity using elastic backscattering, i.e. Brillouin or Raman, to detect the measured quantity
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/02Optical fibre with cladding with or without a coating
    • G02B6/02033Core or cladding made from organic material, e.g. polymeric material
    • G02B6/02038Core or cladding made from organic material, e.g. polymeric material with core or cladding having graded refractive index
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using infra-red, visible or ultra-violet light
    • G01N21/62Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/636Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited using an arrangement of pump beam and probe beam; using the measurement of optical non-linear properties
    • G01N2021/638Brillouin effect, e.g. stimulated Brillouin effect

Abstract

A pipe monitoring system using a distributed optical fiber sensor is provided to sense water leakage and damage to pipes due to the strain and the temperature change of the pipes by analyzing and correcting the strain and the temperature of the pipe. A pipe monitoring system using a distributed optical fiber sensor comprises a pipe, a pipe joint unit(130), a measuring unit, and a signal processing unit(300). Two spiral grooves are formed at the pipe. A distributed optical fiber is inserted into the pipe. The measuring unit surrounds the pipe and generates pulsed light in order to measure the strain and the temperature of the pipe. The measuring unit sends CW light from the end of the pipe and measures the Brillouin scattered light amplified with a receiver. The CW light amplifies the Brillouin scattered light. The signal processing unit analyzes and processes data measured in the receivers(250, 260) of the measuring unit.

Description

System for monitering pipe using distributed Optical Fiber sensor}

The present invention can detect the leakage and damage of the pipe by measuring the strain and temperature of the pipe by using the distributed optical fiber sensor, more specifically, the distributed optical fiber is inserted into one side and the tile side to have a 180 ° phase difference in the pipe. Form two helical grooves to insert the optical fiber into each of the two helical grooves, and send light from the light source unit to measure the Brillouin scattering wave to measure the strain and temperature of the pipe, and the strains measured by the two optical fibers, respectively. And a pipe-type monitoring system using a distributed optical fiber sensor capable of accurately detecting leakage and breakage according to strain and temperature changes of the pipe by correcting strain and temperature of the pipe by comparing and analyzing temperature.

In general, there are various pipes in the ground to deliver various fluids such as oil, gas and water. As described above, pipes that deliver various fluids are deformed due to leakage due to aging of the pipes and buried underground and pressures on the ground, causing damage to the pipes due to twisting of pipes and pipe joints. Can be. As a result of leaks and strains in the pipes, concerns about safety accidents and enormous losses could not be excluded, depending on the type of fluid being discharged. Many research and development has been done.

Conventionally, the degree of corrosion was measured to detect leakage and breakage of the pipe, and the degree of corrosion of the pipe was measured by an electrical potential test box installed at about 300m intervals on the road. There was a problem that such a test box caused a traffic obstacle when measuring the corrosion degree of the pipe by the structure installed on the road through which the vehicle passes. In addition, if the test box is exposed to the ground, snow, rain, or dust enters the test box, and if it is not periodically removed, the effect of the electric method is reduced, and the electrically connected lead wires and connection terminals There was an uncomfortable problem that the corroded and had to be replaced, and when measuring the potential, only the corrosion state of the pipe could be measured, and the warpage of the pipe due to the deformation of the pipe due to external impact or pressure could not be measured.

In addition, another conventional leak and damage detection method of the pipe is attached to the sensor on both sides of the pipe, the hydrant meter and the like to calculate the leak point by calculating the time difference that the same leak sound transmitted from the leak point to both detectors Although the equipment was utilized, this method not only has to operate the detection panel because the manpower has to be directly injected to the site where the pipes are periodically buried, but also the vehicle traffic, groundwater flow, and surrounding construction occurring around the pipes. There was a problem that it is difficult to accurately detect the leak sound due to the noise.

The present invention was devised to solve the above problems, one side and the tile side so that there is 180 ° phase difference in the pipe to measure the strain and temperature of the pipe using a distributed optical fiber sensor to detect the leakage and damage of the pipe Form two helical grooves into which the distributed optical fiber can be inserted into and insert the optical fibers into the two helical grooves respectively, and measure the Brillouin scattering wave to measure the strain and temperature of the pipe, respectively. It is an object of the present invention to provide a pipe monitoring system using a distributed optical fiber sensor that accurately detects leakage and breakage according to strain and temperature changes of the pipe by compensating strain and temperature of the pipe by comparing and analyzing temperatures.

Also, a pipe connecting jig is formed at a pipe joint part connecting the pipe, which is the weakest part of the pipe, to penetrate the optical fiber to the pipe connecting jig to prevent strain of the connecting part between the pipe and the pipe without damaging the optical fiber. Another object of the present invention is to provide a pipe monitoring system using a distributed optical fiber sensor that can measure temperature and detect leakage and breakage of the pipe joint.

The present invention provides a pipe monitoring system using a distributed optical fiber sensor that can detect the leakage and damage of the pipe by measuring the strain and temperature of the pipe using the distributed optical fiber sensor,

A pipe forming two helical grooves to be 180 ° out of phase so as to insert the distributed optical fiber;

A pipe joint part for fastening a pipe connecting jig part to form a groove into which a distributed optical fiber can be inserted into a pipe joint for connecting the pipe with the pipe;

Insert the optical fiber into the spiral groove formed in the pipe to surround the pipe and send pulse light to measure the strain and temperature of the pipe, and send CW light to amplify Brillouin scattered light at the end of the connected pipe and amplify it by the receiver. A measurement unit for measuring the brillouin scattered light;

A signal processing unit for analyzing and processing data measured by the receiving unit of the measuring unit; Characterized in that consists of.

In addition, the pipe is formed by forming two spiral grooves having a 180 ° phase difference to insert two distributed optical fibers, and apply the resin into which the two optical fibers are inserted with a resin to ground the pipe when the pipe is buried underground. It is characterized by preventing the optical fiber from being broken by the pressure generated in the.

The pipe joint part

A pipe joint for welding and connecting the pipe to the pipe;

A pipe connection jig unit formed at an upper end of the pipe joint part to surround a protruding portion of the pipe joint part and fastened with a bolt;

An optical fiber insertion groove formed at one side and the tile side of the pipe connecting jig to pass through two distributed optical fibers which spirally wrap the pipe;

A pipe joint cover covering a pipe connecting jig so as to protect the optical fiber by pressure generated in the ground when the pipe is buried underground; Characterized in that consists of.

At this time, the optical fiber insertion groove is characterized in that the inlet and outlet of the groove when the optical fiber is inserted to prevent the breakage of the optical fiber.

The measuring unit may include a distributed first optical fiber inserted into a spiral groove on one side of a pipe having two spiral grooves having a 180 ° retardation, and a distributed second optical fiber inserted into a spiral groove on a tile side of the pipe. And a pulsed light source unit for transmitting pulsed light to the first and second optical fibers, a CW light source unit formed at the end of the pipe to amplify Brillouin scattering waves scattered by changes in the surrounding environment, and the first and second optical fibers It consists of a first receiver and a second receiver for receiving the amplified Brillouin scattering wave propagating through the two optical fibers, characterized in that for measuring the strain and temperature of the pipe.

The signal processing unit processes the Brillouin scattering wave measured through the first receiver to measure a strain and temperature for the first optical fiber, and a Brillouin scattering wave measured through the second receiver. And a second measuring unit measuring strain and temperature for the second optical fiber, and a data compensating unit compensating for the strain and temperature of the entire pipe by comparing and analyzing the data of the first measuring unit and the data of the second measuring unit. .

The present invention is to spirally wound two distributed optical fibers in the pipe to give a phase difference of 180 ° to measure the strain and the temperature change of the pipe and to correct using the measured strain and temperature change to accurately correct the leak and damage locations of the pipe. There is a detectable effect.

In addition, the present invention forms a pipe connecting jig portion in the pipe joint portion connecting the pipe and the pipe which is the weakest part of the pipe through the optical fiber to the pipe connecting jig to the connection portion between the pipe and the pipe without damaging the optical fiber By measuring the strain and the temperature of the pipe joint there is an effect that can detect the leakage and breakage.

Hereinafter, a pipe monitoring system using a distributed optical fiber sensor according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of a pipe monitoring system using a distributed optical fiber sensor according to the present invention, FIG. 2 is a perspective view of a pipe monitoring system using a distributed optical fiber sensor according to the present invention, and FIG. 3 is a distributed type according to the present invention. 4 is a detailed cross-sectional view of a pipe joint part of a pipe monitoring system using an optical fiber sensor, and FIG. 4 is a configuration diagram of a pipe monitoring system using a distributed optical fiber sensor according to the present invention.

As shown in FIG. 1, the present invention uses the distributed optical fiber sensor to measure the strain and temperature of the pipe to insert the distributed optical fiber 210, 220 to detect the leakage and damage of the pipe 100. It is distributed in pipe 100 forming two spiral grooves 110 and 111 having a 180 ° retardation, and pipe joint 131 for connecting between pipe 100 and pipe 100. Piping joint 130 to form a pipe connecting jig 132 into which the optical fibers 210 and 220 can be inserted and fastened with bolts 135 and two spiral grooves 110 formed in the pipe 100. And 111 respectively inserting optical fibers 210 and 220 to surround the pipe 100 to send pulsed light to measure strain and temperature of the pipe 100, and amplify Brillouin scattered light at the ends of the pipe 100. Measurement unit for measuring the Brillouin scattered light amplified by the receiving unit (250, 260) by sending a CW light for And a signal processor 300 for analyzing and processing data measured by the receivers 250 and 260 of the measurement unit 200.

As shown in FIGS. 1 and 2, the pipe 100 is formed so as to rotate two spiral grooves 110 and 111 in the same direction so as to have a 180 ° phase difference to the grooves 110 and 111 of the spiral shape. After the two distributed optical fibers 210 and 220 are inserted, the resin 120 is applied to the optical fibers 210 and 220 and the grooves 110 and 111 of the spiral shape, and the resin 120 is a pipe 100. When buried underground, the optical fibers 210 and 220 are protected by the pressure generated in the ground, and the optical fibers 210 and 220 may be fixed to the spiral grooves 110 and 111 of the pipe 100. do. In addition, the pipe 100 forms a pipe joint part 130 at a welded portion for connecting the pipe 100 and the pipe 100, and the pipe joint part 130 has optical fibers 210 and 220. It consists of a structure that can measure the strain and temperature of the welded portion between the pipe 100 and the pipe (100).

As shown in FIG. 3, the pipe joint part 130 is formed on a pipe joint 131 and an upper end of the pipe joint 131 for welding and connecting the pipe 100 and the pipe 100 to each other. The pipe connecting jig 132 formed to surround the protruding portion of the pipe joint 131 and fastened with a bolt 135, and two optical fibers 210 and 220 are provided at the pipe connecting jig 132. The optical fiber insertion groove 133 is formed on one side and the tile side to penetrate. The optical fiber insertion groove 133 is formed in a curved surface to prevent the optical fibers 210 and 220 from being damaged by a right angle when the optical fiber passes through the inlet and the outlet, and the pipe connecting jig 132 The pipe joint cover 134 is formed at the upper end of the optical fiber 210, 220 passing through the pipe connecting jig 132 in the pipe 100 by the pressure generated in the ground when the pipe 100 is buried underground. Protect the exposed part of the product from damage.

In addition, the measurement unit 200 is inserted into the spiral grooves 110 and 111 of the pipe 100 formed with two spiral grooves 110 and 111 so as to have a 180 ° phase difference as shown in FIG. Distribution type first optical fiber 210 and second optical fiber 220, a pulsed light source unit 230 for emitting pulsed light to the first optical fiber 210 and the second optical fiber 220, and the end of the pipe 100 Receives the CW light source 240 and amplified Brillouin scattering wave proceeds through the first optical fiber 210 and the second optical fiber 220 is formed in the amplification Brillouin scattering wave scattered by the change of the surrounding environment The first receiving unit 250 and the second receiving unit 260 to measure the strain and the temperature of the pipe 100.

The Brillouin scattered wave measured by the first receiver 250 and the second receiver 260 is transmitted to the signal processor 300, and the signal processor 300 is a Brill measured by the first receiver 250. The strain and temperature of the pipe 100 through the Brillouin scattered wave measured through the first measuring unit 310 and the second receiver 260 to measure the strain and temperature of the pipe 100 through the Loang scattering wave. It consists of a second measuring unit 320 for measuring, the strain and temperature of the pipe 100 measured by the first measuring unit 310 and the second measuring unit 320 is 180 ° phase difference of the pipe 100 It is measured by each of the pipe 100 through this through a comparative analysis of the strain and temperature is made of a data correction unit 330 to correct the strain and temperature.

The present invention consists of the configuration as described above two strained optical fibers 210, 220 with a 180 ° phase difference in the pipe 100 when measuring strain and temperature of the pipe 100 through the distributed optical fiber sensor pipe 100 Inserted into the grooves 110 and 111 of the spiral shape to measure the strain and temperature of the pipe 100 and correct the measured two strains and temperature changes through the data correction unit 330 to correct the pipe 100 It can measure the strain and temperature of the pipe, through which it is possible to detect the leakage and damage location of the pipe (100), pipes 100 and the joints of the pipe 100, which is a weak part of the pipe 100 damage Forming the joint 130 to penetrate the optical fibers (210, 220) to measure the strain and temperature of the weak part, as well as the optical fiber (210, 220) when the pipe 100 is buried underground It can protect from the pressure which arises.

As described above, preferred embodiments according to the present invention have been described, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the scope of the present invention as claimed in the following claims. Anyone with knowledge of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

1 is a conceptual diagram of a pipe monitoring system using a distributed optical fiber sensor according to the present invention.

Figure 2 is a perspective view of the pipe of the pipe monitoring system using a distributed optical fiber sensor according to the present invention.

Figure 3 is a detailed cross-sectional view of the pipe joint of the pipe monitoring system using a distributed optical fiber sensor according to the present invention.

Figure 4 is a block diagram of a pipe monitoring system using a distributed optical fiber sensor according to the present invention.

** SIGNS FOR MAIN PARTS OF THE DRAWINGS **

100: pipe 110, 111: spiral groove

120: resin 130: pipe joint

131: pipe joint 132: pipe connection jig

133: optical fiber insertion groove 134: pipe joint cover

135: bolt 200: measuring unit

210: first optical fiber 220: second optical fiber

230: pulse light source 240: CW light source

250: first receiving unit 260: second receiving unit

300: signal processing unit 310: first measuring unit

320: second measurement unit 330: data correction unit

Claims (6)

  1. In the pipe monitoring system using a distributed optical fiber sensor that can detect the leakage and breakage of the pipe by measuring the strain and temperature of the pipe using a distributed optical fiber sensor,
    A pipe forming two helical grooves to be 180 ° out of phase so as to insert the distributed optical fiber;
    A pipe joint part for welding and connecting the pipe and the pipe, a pipe connection jig part formed at an upper end of the pipe joint part and fastened with a bolt to cover the protruding portion of the pipe joint part, and one side of the pipe connection jig part; An optical fiber insertion groove formed on the tile side to form a groove so as to pass through two distributed optical fibers which spirally surround the pipe, thereby forming an inlet and an outlet of the groove into a curved surface to prevent breakage of the optical fiber; A pipe joint part including a pipe joint cover covering a pipe connecting jig part to protect the optical fiber by pressure generated in the ground when the pipe is buried underground;
    Insert the optical fiber into the spiral groove formed in the pipe to surround the pipe and send pulse light to measure the strain and temperature of the pipe, and send CW light to amplify Brillouin scattered light at the end of the connected pipe and amplify it by the receiver. A measurement unit for measuring the brillouin scattered light;
    A signal processing unit for analyzing and processing data measured by the receiving unit of the measuring unit; Piping monitoring system using a distributed optical fiber sensor, characterized in that consisting of.
  2. The method of claim 1,
    The pipe is formed in two spiral grooves with a 180 ° phase difference to insert two distributed optical fibers, and the grooves into which the two optical fibers are inserted are coated with resin to be generated in the ground when the pipe is buried underground. Pipe monitoring system using a distributed optical fiber sensor, characterized in that to prevent the optical fiber is broken by the pressure.
  3. delete
  4. delete
  5. The method of claim 1,
    The measuring unit includes a distributed first optical fiber inserted into a groove of one spiral of a pipe having two spiral grooves having a 180 ° retardation, a distributed second optical fiber inserted into a groove of a spiral of a tile side of the pipe; A pulsed light source unit for transmitting pulsed light to the first and second optical fibers, a CW light source unit formed at the end of the pipe to amplify Brillouin scattering waves scattered by changes in the surrounding environment, and the first and second optical fibers Pipe monitoring system using a distributed optical fiber sensor comprising a first receiving unit and a second receiving unit for receiving the amplified Brillouin scattering wave proceeding through the measuring strain and temperature of the pipe.
  6. The method of claim 5,
    The signal processing unit processes the Brillouin scattering wave measured through the first receiving unit to measure the strain and temperature for the first optical fiber, and to process the Brillouin scattering wave measured through the second receiving unit. And a second measuring unit measuring strain and temperature for the second optical fiber, and a data compensating unit compensating for the strain and temperature of the entire pipe by comparing and analyzing data of the first measuring unit and data of the second measuring unit. Piping monitoring system using distributed fiber optic sensor.
KR1020080116752A 2008-11-24 2008-11-24 System for monitering pipe using distributed optical fiber sensor KR100913536B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101162469B1 (en) 2011-10-24 2012-07-04 마이클 명섭 리 Device for sloshing monitoring in tank of liquified natural gas carrier
KR101263293B1 (en) * 2012-01-05 2013-05-10 유지형 Burying type measuring instrument and method of ground using the same
US8528385B2 (en) 2010-12-30 2013-09-10 Eaton Corporation Leak detection system
US9291521B2 (en) 2010-12-30 2016-03-22 Eaton Corporation Leak detection system
KR20160109330A (en) * 2015-03-11 2016-09-21 한국광기술원 system for detecting leakage of valve
KR101912879B1 (en) * 2016-10-31 2018-10-30 코스모아이앤디 주식회사 High Density Polyethylene Pipe Damage and Deformation Detection System

Citations (2)

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Publication number Priority date Publication date Assignee Title
KR20030048817A (en) * 2001-12-13 2003-06-25 주식회사 세미텔 Sensing system using optical-fiber
KR20050061704A (en) * 2003-12-18 2005-06-23 (주)세기엔지니어링 Method of security diagnosis and fire observation using sensor system of brillouin scattering type

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030048817A (en) * 2001-12-13 2003-06-25 주식회사 세미텔 Sensing system using optical-fiber
KR20050061704A (en) * 2003-12-18 2005-06-23 (주)세기엔지니어링 Method of security diagnosis and fire observation using sensor system of brillouin scattering type

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8528385B2 (en) 2010-12-30 2013-09-10 Eaton Corporation Leak detection system
US9897508B2 (en) 2010-12-30 2018-02-20 Eaton Corporation Leak detection system
US9291521B2 (en) 2010-12-30 2016-03-22 Eaton Corporation Leak detection system
KR101162469B1 (en) 2011-10-24 2012-07-04 마이클 명섭 리 Device for sloshing monitoring in tank of liquified natural gas carrier
WO2013062147A1 (en) * 2011-10-24 2013-05-02 Lee Michael Myungsub Apparatus and method for measuring the sloshing in the cargo tank of a liquefied natural gas carrier
CN104081108B (en) * 2011-10-24 2016-12-21 李明燮 The measurement apparatus of sloshing phenomenon and method in liquified natural gas carrier (LNGC) cargo container
US9709389B2 (en) 2011-10-24 2017-07-18 Michael Myungsub Lee Apparatus and method for measuring the sloshing in the cargo tank of a liquefied natural gas carrier
CN104081108A (en) * 2011-10-24 2014-10-01 李明燮 Apparatus and method for measuring the sloshing in the cargo tank of a liquefied natural gas carrier
KR101263293B1 (en) * 2012-01-05 2013-05-10 유지형 Burying type measuring instrument and method of ground using the same
KR20160109330A (en) * 2015-03-11 2016-09-21 한국광기술원 system for detecting leakage of valve
KR101664314B1 (en) * 2015-03-11 2016-10-10 한국광기술원 system for detecting leakage of valve
KR101912879B1 (en) * 2016-10-31 2018-10-30 코스모아이앤디 주식회사 High Density Polyethylene Pipe Damage and Deformation Detection System

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