KR102647245B1 - Optical Fiber Sensor System For Measuring Temperature And Vibration - Google Patents

Optical Fiber Sensor System For Measuring Temperature And Vibration Download PDF

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KR102647245B1
KR102647245B1 KR1020210127528A KR20210127528A KR102647245B1 KR 102647245 B1 KR102647245 B1 KR 102647245B1 KR 1020210127528 A KR1020210127528 A KR 1020210127528A KR 20210127528 A KR20210127528 A KR 20210127528A KR 102647245 B1 KR102647245 B1 KR 102647245B1
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optical
light
circulator
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output
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KR20230045699A (en
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조성칠
신상봉
전태현
전혜영
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(주)노티스
주식회사 한국가스기술공사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING 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
    • G01D5/00—Mechanical 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
    • G01D5/26—Mechanical 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 infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical 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 infrared, visible, or ultraviolet 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
    • G01D5/35338—Mechanical 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 infrared, visible, or ultraviolet 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
    • G01D5/35354—Sensor working in reflection
    • G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING 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
    • G01D5/00—Mechanical 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
    • G01D5/26—Mechanical 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 infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical 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 infrared, visible, or ultraviolet 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
    • G01D5/35306—Mechanical 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 infrared, visible, or ultraviolet 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 an interferometer arrangement
    • G01D5/35335—Aspects of emitters or receivers used by an interferometer in an optical fibre sensor arrangement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING 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
    • G01D5/00—Mechanical 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
    • G01D5/26—Mechanical 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 infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical 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 infrared, visible, or ultraviolet 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
    • G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/35377—Means for amplifying or modifying the measured quantity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING 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
    • G01D5/00—Mechanical 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
    • G01D5/26—Mechanical 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 infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical 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 infrared, visible, or ultraviolet 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
    • G01D5/35383—Mechanical 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 infrared, visible, or ultraviolet 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 multiple sensor devices using multiplexing techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
    • 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

Abstract

분포형 음향 센서용 광을 발진하는 제1 레이저 다이오드, 상기 제1 레이저 다이오드가 출력한 광을 신호 출력광과 기준광으로 분기하는 제1 커플러, 상기 기준광을 수신하는 밸런스 포토 다이오드, 상기 신호 출력광을 증폭하고 광펄스로 변환하는 반도체 광증폭기, 상기 광펄스로 변환된 신호 출력광의 주파수를 변조하여 분포형 음향 센서용 광펄스를 생성하는 음향 광학 변조기, 분포형 온도 센서용 광펄스를 발진하는 제2 레이저 다이오드, 상기 분포형 온도 센서용 광펄스와 상기 분포형 음향 센서용 광펄스를 혼합하여 혼합 광신호를 출력하는 제2 커플러, 특정 파장 대역의 광만 반사하고 나머지는 통과시키는 FBG 필터, 상기 혼합 광신호를 상기 FBG 필터로 전달하고, 상기 FBG 필터로부터 반사되어 입사하는 광을 제3 단자로 전달하는 제1 서큘레이터, 상기 제1 서큘레이터로부터 입사하는 광을 제1 출력 단자로 전달하고, 상기 제1 출력 단자로부터 입사하는 광은 상기 밸런스 포토 다이오드로 전달하는 제2 서큘레이터, 센싱 대상 광섬유와 제2 서큘레이터 사이에 연결되는 광학 스위치, 상기 FBG 필터의 출력단과 상기 광학 스위치의 사이에 직렬로 연결되어 있는 1480 WDM 커플러 및 C/L WDM 커플러를 포함하는 온도와 진동 측정을 위한 광섬유 센서 시스템.A first laser diode that oscillates light for a distributed acoustic sensor, a first coupler that splits the light output from the first laser diode into signal output light and reference light, a balance photo diode that receives the reference light, and the signal output light. A semiconductor optical amplifier that amplifies and converts into optical pulses, an acousto-optic modulator that modulates the frequency of the signal output light converted into optical pulses to generate optical pulses for a distributed acoustic sensor, and a second oscillates an optical pulse for a distributed temperature sensor. A laser diode, a second coupler that mixes the optical pulse for the distributed temperature sensor and the optical pulse for the distributed acoustic sensor to output a mixed optical signal, an FBG filter that reflects only light in a specific wavelength band and passes the rest, and the mixed light A first circulator that transmits a signal to the FBG filter and transmits the light reflected and incident from the FBG filter to a third terminal, transmits the light incident from the first circulator to a first output terminal, and 1 A second circulator transmits the light incident from the output terminal to the balance photodiode, an optical switch connected between the sensing target optical fiber and the second circulator, and connected in series between the output terminal of the FBG filter and the optical switch. Fiber optic sensor system for temperature and vibration measurements including a 1480 WDM coupler and a C/L WDM coupler.

Figure R1020210127528
Figure R1020210127528

Description

온도와 진동 측정을 위한 광섬유 센서 시스템{Optical Fiber Sensor System For Measuring Temperature And Vibration}Optical Fiber Sensor System For Measuring Temperature And Vibration}

본 발명은 광케이블을 이용하여 감시 대상물의 진동과 온도의 장거리 분포 특성을 동시에 측정할 수 있는 광섬유 센서 시스템에 관한 것이다. The present invention relates to an optical fiber sensor system that can simultaneously measure the long-distance distribution characteristics of vibration and temperature of a monitored object using an optical cable.

가스관과 같이 장거리에 걸쳐 분포되어 있는 구조물의 상태를 감시하여 이상 발생시 신속한 수리 또는 대응을 위한 감시 시스템이 요구되고 있다. There is a need for a monitoring system to monitor the status of structures distributed over long distances, such as gas pipes, and to quickly repair or respond when an abnormality occurs.

이러한 감시 시스템으로는 장거리 온도 분포를 측정하는 분포형 온도 센서 (Distributed Temperature Sensor: DTS)와 장거리 음향/진동 분포 특성을 측정하는 분포형 음향/진동 센서 (Distributed Acoustic/Vibration Sensor: DAS) 등이 있고, 이들 각각은 측정하는 물리량의 특성에 따라 각각 별도로 시스템으로 구성된다. 일반적인 DTS 시스템의 경우 라만 필터(Raman filter)와 같은 고가의 소자가 필요하여 그 자체만으로도 고가이고, 여기에 DAS 시스템을 별도로 설치하는 경우 가격이 비싼 것은 물론이고 설치나 관리에 있어서도 이중의 노력과 비용이 소요된다.These monitoring systems include the Distributed Temperature Sensor (DTS), which measures long-distance temperature distribution, and the Distributed Acoustic/Vibration Sensor (DAS), which measures long-distance acoustic/vibration distribution characteristics. , each of these is composed of a separate system according to the characteristics of the physical quantity being measured. In the case of a general DTS system, expensive elements such as Raman filters are required, which is expensive in itself, and if a DAS system is installed separately, not only is the price expensive, but double effort and cost are incurred in installation and management. It takes this.

이에 이들 DTS와 DAS를 통합할 수 있는 시스템에 대한 요구가 있으나, 서로 다른 물리량을 측정하기 위한 시스템을 통합하는 데는 여려 어려움이 따른다. Accordingly, there is a demand for a system that can integrate these DTS and DAS, but there are many difficulties in integrating systems for measuring different physical quantities.

본 발명의 실시예는 이러한 종래 기술의 문제점을 해소하고 분포형 온도와 진동 측정을 병행할 수 있는 광섬유 센서 시스템을 제공하기 위한 것이다.Embodiments of the present invention are intended to solve the problems of the prior art and provide an optical fiber sensor system that can simultaneously measure distributed temperature and vibration.

본 발명의 일 실시예에 따른 온도와 진동 측정을 위한 광섬유 센서 시스템은 분포형 음향 센서용 광을 발진하는 제1 레이저 다이오드, 상기 제1 레이저 다이오드가 출력한 광을 신호 출력광과 기준광으로 분기하는 제1 커플러, 상기 기준광을 소정의 세기로 감쇠하는 제1 감쇠기, 상기 제1 감쇠기를 거친 상기 기준광을 수신하는 밸런스 포토 다이오드, 상기 신호 출력광을 소정의 세기로 감쇠하는 제2 감쇠기, 상기 제2 감쇠기를 거친 상기 신호 출력광을 증폭하고 광펄스로 변환하는 반도체 광증폭기, 상기 광펄스로 변환된 신호 출력광의 주파수를 변조하여 분포형 음향 센서용 광펄스를 생성하는 음향 광학 변조기, 분포형 온도 센서용 광펄스를 발진하는 제2 레이저 다이오드, 상기 분포형 온도 센서용 광펄스와 상기 분포형 음향 센서용 광펄스를 혼합하여 혼합 광신호를 출력하는 제2 커플러, 상기 혼합 광신호를 소정의 세기로 증폭하는 전광 증폭기, 특정 파장 대역의 광만 반사하고, 나머지는 통과시키는 FBG 필터, 상기 전광 증폭기로부터 입사하는 광을 상기 FBG 필터로 전달하고, 상기 FBG 필터로부터 반사되어 입사하는 광을 제3 단자로 전달하는 제1 서큘레이터, 상기 제1 서큘레이터의 상기 제3 단자에 연결되어 있고, 상기 제1 서큘레이터로부터 입사하는 광을 제1 출력 단자로 전달하고, 상기 제1 출력 단자로부터 입사하는 광은 상기 밸런스 포토 다이오드로 전달하는 제2 서큘레이터, 상기 제2 서큘레이터의 상기 제1 출력 단자에 제1 단자가 연결되어 있고, 센싱 대상 광섬유에 제2 단자가 연결되며, 제3 단자를 가지는 광학 스위치, 상기 FBG 필터의 출력단과 상기 광학 스위치의 제3 단자 사이에 직렬로 연결되어 있는 1480 WDM 커플러 및 C/L WDM 커플러를 포함하고,An optical fiber sensor system for temperature and vibration measurement according to an embodiment of the present invention includes a first laser diode that oscillates light for a distributed acoustic sensor, and a first laser diode that splits the light output from the first laser diode into signal output light and reference light. A first coupler, a first attenuator for attenuating the reference light to a predetermined intensity, a balance photo diode for receiving the reference light after passing through the first attenuator, a second attenuator for attenuating the signal output light to a predetermined intensity, the second A semiconductor optical amplifier that amplifies the signal output light after passing through an attenuator and converts it into an optical pulse, an acousto-optic modulator that generates an optical pulse for a distributed acoustic sensor by modulating the frequency of the signal output light converted into an optical pulse, and a distributed temperature sensor. A second laser diode that oscillates an optical pulse, a second coupler that mixes the optical pulse for the distributed temperature sensor and the optical pulse for the distributed acoustic sensor to output a mixed optical signal, and outputs a mixed optical signal at a predetermined intensity. An electro-optical amplifier that amplifies, an FBG filter that reflects only light in a specific wavelength band and passes the rest, transmits light incident from the electro-optical amplifier to the FBG filter, and transmits light reflected and incident from the FBG filter to a third terminal. A first circulator, connected to the third terminal of the first circulator, transmits the light incident from the first circulator to the first output terminal, and the light incident from the first output terminal is connected to the third terminal of the first circulator. A second circulator transmitting data to a balanced photo diode, a first terminal connected to the first output terminal of the second circulator, a second terminal connected to the sensing target optical fiber, and an optical switch having a third terminal, It includes a 1480 WDM coupler and a C/L WDM coupler connected in series between the output terminal of the FBG filter and the third terminal of the optical switch,

상기 광학 스위치는 설정된 시간에 맞춰 상기 제2 서큘레이터와 상기 센싱 대상 광섬유 사이를 연결하는 음향 센서용 광경로를 설정하거나 상기 C/L WDM 커플러와 상기 센싱 대상 광섬유 사이를 연결하는 온도 센서용 광경로를 설정하고,The optical switch sets an optical path for an acoustic sensor connecting between the second circulator and the sensing target optical fiber at a set time, or an optical path for a temperature sensor connecting between the C/L WDM coupler and the sensing target optical fiber. Set ,

상기 밸런스 포토 다이오드는 상기 제1 감쇠기를 통해 입사한 기준광과 상기 센싱 대상 광섬유에서 산란되어 상기 광학 스위치와 상기 제2 서큘레이터를 통해 반송된 측정광을 결합하여 간섭 무늬를 생성하고,The balance photo diode generates an interference pattern by combining the reference light incident through the first attenuator and the measurement light scattered from the sensing target optical fiber and returned through the optical switch and the second circulator,

상기 C/L WDM 커플러는 상기 센싱 대상 광섬유에서 산란되어 반송되는 온도 센서용 광펄스의 산란광의 라만 산란광 중의 장파장 대역인 스톡스 광신호만 걸러서 스톡스 측정 단자로 출력하고, 나머지 산란광은 상기 1480 WDM 커플러로 전달하며, 상기 1480 WDM 커플러는 상기 라만 산란광 중 단파장 대역인 안티스톡스 광신호만을 걸러서 안티스톡스 측정 단자로 출력한다.The C/L WDM coupler filters only the Stokes optical signal in the long wavelength band among the Raman scattered light of the optical pulse for the temperature sensor scattered and returned from the sensing target optical fiber and outputs it to the Stokes measurement terminal, and the remaining scattered light is sent to the 1480 WDM coupler. The 1480 WDM coupler filters only the anti-Stokes optical signal in the short wavelength band among the Raman scattered light and outputs it to the anti-Stokes measurement terminal.

상기 FBG 필터는 온도를 조절하여 반사하는 파장 대역을 조정할 수 있다. The FBG filter can adjust the reflected wavelength band by adjusting the temperature.

상기 밸런스 포토 다이오드가 생성한 간섭 무늬를 상기 센싱 대상 광섬유에 음향이나 진동이 가해지지 않은 상태에서 측정된 기준 간섭 무늬와 비교하여, 음향 또는 진동이 상기 센싱 대상 광섬유에 가해지고 있는지를 판단할 수 있고, 상기 스톡스 광신호와 상기 안티스톡스 광신호를 비교하여 센싱 대상 광섬유의 특정 위치의 온도를 측정할 수 있다.By comparing the interference pattern generated by the balance photo diode with a reference interference pattern measured in a state in which no sound or vibration is applied to the sensing target optical fiber, it is possible to determine whether sound or vibration is applied to the sensing target optical fiber. , the temperature at a specific location of the optical fiber to be sensed can be measured by comparing the Stokes optical signal and the anti-Stokes optical signal.

본 발명의 실시예에 따르면, 분포형 온도와 진동 측정을 병행할 수 있는 광섬유 센서 시스템을 제공할 수 있다.According to an embodiment of the present invention, an optical fiber sensor system capable of simultaneously measuring distributed temperature and vibration can be provided.

도 1은 본 발명의 일 실시예에 따른 온도와 진동 측정을 위한 광섬유 센서 시스템의 구성도이다.
도 2는 본 발명의 일 실시예에 따른 온도와 진동 측정을 위한 광섬유 센서 시스템의 동작을 설명하기 위한 도면이다. Figure 1 is a configuration diagram of an optical fiber sensor system for measuring temperature and vibration according to an embodiment of the present invention.
Figure 2 is a diagram for explaining the operation of an optical fiber sensor system for measuring temperature and vibration according to an embodiment of the present invention.

이하, 첨부한 도면을 참고로 하여 본 발명의 여러 실시예들에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다. 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예들에 한정되지 않는다.Hereinafter, with reference to the attached drawings, various embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The invention may be implemented in many different forms and is not limited to the embodiments described herein.

본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조 부호를 붙이도록 한다.In order to clearly explain the present invention, parts that are not relevant to the description are omitted, and identical or similar components are assigned the same reference numerals throughout the specification.

또한, 도면에서 나타난 각 구성의 크기 및 두께는 설명의 편의를 위해 임의로 나타내었으므로, 본 발명이 반드시 도시된 바에 한정되지 않는다. 도면에서 여러 층 및 영역을 명확하게 표현하기 위하여 두께를 확대하여 나타내었다. 그리고 도면에서, 설명의 편의를 위해, 일부 층 및 영역의 두께를 과장되게 나타내었다.In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown. In the drawing, the thickness is enlarged to clearly express various layers and areas. And in the drawings, for convenience of explanation, the thicknesses of some layers and regions are exaggerated.

또한, 층, 막, 영역, 판 등의 부분이 다른 부분 "위에" 또는 "상에" 있다고 할 때, 이는 다른 부분 "바로 위에" 있는 경우뿐 아니라 그 중간에 또 다른 부분이 있는 경우도 포함한다. 반대로 어떤 부분이 다른 부분 "바로 위에" 있다고 할 때에는 중간에 다른 부분이 없는 것을 뜻한다. 또한, 기준이 되는 부분 "위에" 또는 "상에" 있다고 하는 것은 기준이 되는 부분의 위 또는 아래에 위치하는 것이고, 반드시 중력 반대 방향 쪽으로 "위에" 또는 "상에" 위치하는 것을 의미하는 것은 아니다.Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” or “on” another part, this includes not only cases where it is “directly above” another part, but also cases where there is another part in between. . Conversely, when a part is said to be “right on top” of another part, it means that there is no other part in between. In addition, being “on” or “on” a reference part means being located above or below the reference part, and does not necessarily mean being located “above” or “on” the direction opposite to gravity. .

또한, 명세서 전체에서, 어떤 부분이 어떤 구성요소를 "포함" 한다고 할 때, 이는 특별히 반대되는 기재가 없는 한 다른 구성요소를 제외하는 것이 아니라 다른 구성요소를 더 포함할 수 있는 것을 의미한다.In addition, throughout the specification, when a part is said to "include" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary.

도 1은 본 발명의 일 실시예에 따른 온도와 진동 측정을 위한 광섬유 센서 시스템의 구성도이고, 도 2는 본 발명의 일 실시예에 따른 온도와 진동 측정을 위한 광섬유 센서 시스템의 동작을 설명하기 위한 도면이다. Figure 1 is a configuration diagram of an optical fiber sensor system for measuring temperature and vibration according to an embodiment of the present invention, and Figure 2 illustrates the operation of the optical fiber sensor system for measuring temperature and vibration according to an embodiment of the present invention. This is a drawing for

도 1을 참고하면, 본 발명의 일 실시예에 따른 온도와 진동 측정을 위한 광섬유 센서 시스템은 분포형 음향 센서용 광원인 협대역 레이저광을 발진하는 제1 레이저 다이오드(1), 입사광을 신호 출력광과 기준광으로 분기하는 1x2 광커플러인 제1 커플러(21), 광을 적절한 세기로 감쇠하는 제1 감쇠기(Tunable Attenuator, 31), 기준광과 센싱 대상 광섬유(14)에서 산란되어 회송되는 광의 간섭 신호를 측정하여 분포형 음향 센서의 검출기 역할을 하는 밸런스 포토 다이오드(Balance Photo Diode: BPD, 4), 광을 적절한 세기로 감쇠하는 제2 감쇠기(Tunable Attenuator, 32), 광을 증폭하고 광펄스를 생성하는 반도체 광증폭기(Semiconductor Optical Amplifier: SOA 5), 광신호의 주파수를 변조(phase shift)하는 음향 광학 변조기(Acoustic Optical Modulator: AOM, 6), 분포형 온도 센서용 광펄스를 발진하는 제2 레이저 다이오드(7), 분포형 온도 센서용 광펄스와 분포형 음향 센서용 광펄스를 혼합하여 혼합 광신호를 출력하는 1x2 광커플러인 제2 커플러(22), 혼합 광신호를 충분한 세기로 증폭하는 전광 증폭기(Erbium Doped Fiber Amplifier: EDFA, 8), 광의 입사 경로에 따라 출력 경로를 다르게 가져가는 제1 및 제2 서큘레이터(Circulator, 91, 92), 특정 파장 대역의 광만 반사하고, 나머지는 통과시키는 FBG 필터(Fiber Bragg Grating Filter, 10), 센싱 대상 광섬유(14)에서 산란되어 회송되는 광 중에서 안티스톡스(Anti??Stokes) 신호를 필터링하여 안티스톡스 측정 단자(15)로 보내고 나머지 신호는 통과시키는 1480 WDM 커플러(Wavelength Division Multiplexer Coupler, 11), 센싱 대상 광섬유(14)에서 산란되어 회송되는 광 중에서 스톡스(Stokes) 신호를 필터링하여 스톡스 측정 단자(16)로 보내고 나머지 신호는 통과시키는 C/L WDM 커플러(C/L 밴드 Division Multiplexer Coupler, 12), 설정된 제2 서큘레이터(92)와 상기 센싱 대상 광섬유(14) 사이를 연결하는 C/L WDM 커플러(12)와 상기 센싱 대상 광섬유(14) 사이를 연결하는 1x2 광학 스위치(O Switch, 13), 안티스톡스 측정 단자(15) 및 스톡스 측정 단자(16)를 포함한다. 센싱 대상 광섬유(14)는 감시 대상 가스관 등에 설치되어 있고, 본 실시예의 1x2 광학 스위치(13)의 세 단자 중 하나에 연결되어 있다. 여기서, 제1 서큘레이터(91)는 전광 증폭기(8)로부터 입사하는 광은 FBG 필터(10)로 출력하고, FBG 필터(10)로부터 입사하는 광은 제2 서큘레이터(92)로 출력한다. 제2 서큘레이터(92)는 제1 서큘레이터(91)로부터 입사하는 광은 1x2 광학 스위치(13)로 출력하고, 1x2 광학 스위치(13)로부터 입사하는 광은 밸런스 포토 다이오드(4)로 출력한다.Referring to FIG. 1, the optical fiber sensor system for temperature and vibration measurement according to an embodiment of the present invention includes a first laser diode 1 that oscillates narrow-band laser light, which is a light source for a distributed acoustic sensor, and outputs a signal from the incident light. A first coupler (21), which is a 1x2 optical coupler that diverges into light and reference light, a first attenuator (Tunable Attenuator, 31) that attenuates the light to an appropriate intensity, and an interference signal of light scattered and returned from the reference light and the sensing target optical fiber (14) A Balance Photo Diode (BPD, 4) that measures and acts as a detector for the distributed acoustic sensor, a second attenuator (Tunable Attenuator, 32) that attenuates the light to an appropriate intensity, amplifies the light and generates an optical pulse. Semiconductor Optical Amplifier (SOA 5), an Acoustic Optical Modulator (AOM, 6) that modulates the frequency of the optical signal (phase shift), and a second laser that oscillates optical pulses for distributed temperature sensors. A diode (7), a second coupler (22), which is a 1x2 optical coupler that outputs a mixed optical signal by mixing the optical pulse for the distributed temperature sensor and the optical pulse for the distributed acoustic sensor, and an electro-optical device that amplifies the mixed optical signal to sufficient intensity. Amplifier (Erbium Doped Fiber Amplifier: EDFA, 8), first and second circulators (Circulator, 91, 92) that take different output paths depending on the incident path of light, reflect only light in a specific wavelength band and pass the rest FBG filter (Fiber Bragg Grating Filter, 10) filters the anti-Stokes signal from the light scattered and returned from the sensing target optical fiber (14), sends it to the anti-Stokes measurement terminal (15), and passes the remaining signals. 1480 WDM Coupler (Wavelength Division Multiplexer Coupler, 11), a C/L WDM that filters the Stokes signal from the light scattered and returned from the sensing target optical fiber (14), sends it to the Stokes measurement terminal (16), and passes the remaining signals. Coupler (C/L Band Division Multiplexer Coupler, 12), between the C/L WDM coupler (12) connecting between the set second circulator (92) and the sensing target optical fiber (14) and the sensing target optical fiber (14) It includes a 1x2 optical switch (O Switch, 13), an anti-Stokes measurement terminal (15), and a Stokes measurement terminal (16) that connect. The sensing target optical fiber 14 is installed in a gas pipe to be monitored, etc., and is connected to one of the three terminals of the 1x2 optical switch 13 in this embodiment. Here, the first circulator 91 outputs the light incident from the electro-optical amplifier 8 to the FBG filter 10, and outputs the light incident from the FBG filter 10 to the second circulator 92. The second circulator 92 outputs the light incident from the first circulator 91 to the 1x2 optical switch 13, and outputs the light incident from the 1x2 optical switch 13 to the balance photo diode 4. .

도 2를 참고하면, 제1 레이저 다이오드(1)가 출력한 음향 센서용 광은 제1 커플러(21)에 의해 분기되어 일부는 제1 감쇠기(31)로 입사하고, 나머지는 제2 감쇠기(32)로 입사한다. 이때, 제1 커플러(21)의 분기비는 90:10 또는 95:5 일 수 있다. Referring to FIG. 2, the acoustic sensor light output from the first laser diode 1 is diverged by the first coupler 21, and part of it enters the first attenuator 31, and the remainder enters the second attenuator 32. ) join the company. At this time, the branch ratio of the first coupler 21 may be 90:10 or 95:5.

제1 감쇠기(31)로 입사한 광은 소정의 세기로 감쇠되어 밸런스 포토 다이오드(4)로 출력되어 기준광으로 사용된다. The light incident on the first attenuator 31 is attenuated to a predetermined intensity and output to the balance photo diode 4 to be used as reference light.

제2 감쇠기(32)로 입사한 광은 소정의 세기로 감쇠되어 반도체 광증폭기(5)로 입사하고, 이를 반도체 광증폭기(5)가 증폭하고 동시에 광펄스로 변환하여 음향 광학 변조기(6)로 출력한다. The light incident on the second attenuator 32 is attenuated to a predetermined intensity and enters the semiconductor optical amplifier 5. The semiconductor optical amplifier 5 amplifies it and simultaneously converts it into an optical pulse and transmits it to the acousto-optic modulator 6. Print out.

음향 광학 변조기(6)는 입사한 광펄스의 주파수를 변조하여 제2 커플러(22)로 출력한다. 여기서 주파수 변조는 제1 감쇠기(31)를 통해 밸런스 포토 다이오드(4)로 출력된 기준광과 소정의 주파수 차이가 발생하도록 하여 간섭 무늬를 얻기 위함이다.The acousto-optic modulator 6 modulates the frequency of the incident light pulse and outputs it to the second coupler 22. Here, the frequency modulation is used to obtain an interference pattern by generating a predetermined frequency difference between the reference light output to the balance photo diode 4 through the first attenuator 31.

주파수 변조된 음향 센서용 광펄스는 제2 커플러(22)에서 제2 레이저 다이오드(7)가 출력하는 온도 센서용 광펄스와 혼합되어 전광 증폭기(8)로 입사하고, 전광 증폭기(8)는 이들 광펄스를 필요한 세기로 증폭하여 제1 서큘레이터(91)로 출력하며, 제1 서큘레이터(91)는 이들 광펄스를 FBG 필터(10)로 전달한다.The frequency-modulated optical pulse for the acoustic sensor is mixed with the optical pulse for the temperature sensor output from the second laser diode 7 in the second coupler 22 and enters the electro-optical amplifier 8, and the electro-optical amplifier 8 The optical pulses are amplified to the required intensity and output to the first circulator 91, and the first circulator 91 transmits these optical pulses to the FBG filter 10.

FBG 필터(10)는 음향 센서용 광펄스만을 반사하고 나머지 광신호는 통과시키도록 설정되어 있다. FBG 필터(10)는 광의 파장에 따라 일부 대역만을 반사하고 나머지는 통과시키는 필터이고, 그 온도를 조절함으로써 반사시키는 광의 파장 대역을 조정할 수 있다.The FBG filter 10 is set to reflect only the optical pulses for the acoustic sensor and pass the remaining optical signals. The FBG filter 10 is a filter that reflects only a portion of the band and passes the rest depending on the wavelength of light, and the wavelength band of the reflected light can be adjusted by adjusting its temperature.

FBG 필터(10)에서 반사된 음향 센서용 광펄스는 제1 서큘레이터(91)로 되돌아가서 제2 서큘레이터(92)와 1x2 광학 스위치(13)를 거쳐서 센싱 대상 광섬유(14)로 출력된다. The optical pulse for the acoustic sensor reflected from the FBG filter 10 returns to the first circulator 91 and is output to the sensing target optical fiber 14 through the second circulator 92 and the 1x2 optical switch 13.

센싱 대상 광섬유(14)에서 산란되어 반송되는 음향 센서용 광펄스는 1x2 광학 스위치(13)와 제2 서큘레이터(92)를 거쳐 밸런스 포토 다이오드(4)로 입사한다. The optical pulse for the acoustic sensor, which is scattered and returned from the sensing target optical fiber 14, passes through the 1x2 optical switch 13 and the second circulator 92 and enters the balance photo diode 4.

밸런스 포토 다이오드(4)는 제1 감쇠기(31)를 통해 밸런스 포토 다이오드(4)로 입사한 기준광과 센싱 대상 광섬유(14)에서 산란되어 반송된 측정광을 결합하여 간섭 무늬를 생성하고, 이 간섭 무늬를 센싱 대상 광섬유(14)에 음향이나 진동이 가해지지 않은 상태에서 측정된 기준 간섭 무늬와 비교하여 음향 또는 진동이 센싱 대상 광섬유(14)에 가해지고 있는지를 판단한다.The balance photo diode 4 generates an interference pattern by combining the reference light incident on the balance photo diode 4 through the first attenuator 31 and the measurement light scattered and returned from the sensing target optical fiber 14, and this interference The pattern is compared with a reference interference pattern measured in a state in which no sound or vibration is applied to the sensing target optical fiber 14 to determine whether sound or vibration is applied to the sensing target optical fiber 14.

FBG 필터(10)를 통과한 온도 센서용 광펄스는 1480 WDM 커플러(11)와 C/L WDM 커플러(12) 그리고 1x2 광학 스위치(13)를 거쳐 센싱 대상 광섬유(14)로 출력된다. The optical pulse for the temperature sensor that has passed through the FBG filter (10) is output to the sensing target optical fiber (14) through the 1480 WDM coupler (11), the C/L WDM coupler (12), and the 1x2 optical switch (13).

센싱 대상 광섬유(14)로 출력된 온도 센서용 광펄스는 산란되어 반송되는데, 여기에는 레일레히(Rayleigh) 산란광 및 라만(Raman) 산란광이 포함되어 있다. 여기서 레일레히(Rayleigh) 산란광은 온도 센서용 광펄스와 동일한 파장 대역(파장 1550nm 부근)을 가지고, 라만(Raman) 산란광은 레일레히(Rayleigh) 산란광 양쪽으로 분산된 대역에 한 개씩 나타난다.The optical pulse for the temperature sensor output through the sensing target optical fiber 14 is scattered and returned, and includes Rayleigh scattered light and Raman scattered light. Here, the Rayleigh scattered light has the same wavelength band (around 1550 nm wavelength) as the optical pulse for the temperature sensor, and the Raman scattered light appears one at a time in the bands distributed on both sides of the Rayleigh scattered light.

센싱 대상 광섬유(14)에서 산란되어 반송되는 온도 센서용 광펄스의 산란광은 1x2 광학 스위치(13)를 거쳐 C/L WDM 커플러(12)로 입사하고, C/L WDM 커플러(12)는 라만 산란광 중의 장파장 대역(파장 1650nm 부근)인 스톡스 광신호만 걸러서 스톡스 측정 단자(16)로 출력하고, 나머지 산란광은 1480 WDM 커플러(11)로 전달한다.The scattered light of the optical pulse for the temperature sensor, which is scattered and returned from the sensing target optical fiber (14), passes through the 1x2 optical switch (13) and enters the C/L WDM coupler (12), and the C/L WDM coupler (12) transmits the Raman scattered light. Only the Stokes optical signal in the long-wavelength band (around 1650 nm wavelength) is filtered and output to the Stokes measurement terminal (16), and the remaining scattered light is transmitted to the 1480 WDM coupler (11).

1480 WDM 커플러(11)는 라만 산란광 중 단파장 대역(파장 1450nm 부근)인 안티스톡스 광신호만을 걸러서 안티스톡스 측정 단자(15)로 출력한다. The 1480 WDM coupler (11) filters only the anti-Stokes optical signal in the short wavelength band (wavelength around 1450 nm) among the Raman scattered light and outputs it to the anti-Stokes measurement terminal (15).

이렇게 출력된 스톡스 광신호와 안티스톡스 광신호를 비교하여 센싱 대상 광섬유(14)의 특정 위치의 온도를 측정한다. 여기서 안티스톡스 광신호가 온도에 따라 크게 변화하고, 스톡스 광신호는 그 변화가 적어서 이들을 비교함으로써 온도를 확인할 수 있다.By comparing the output Stokes optical signal and the anti-Stokes optical signal, the temperature at a specific location of the optical fiber 14 to be sensed is measured. Here, the anti-Stokes optical signal changes greatly depending on the temperature, and the Stokes optical signal changes little, so the temperature can be confirmed by comparing them.

이상에서 본 발명의 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고 다음의 청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 형태 또한 본 발명의 권리범위에 속하는 것이다.Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. It falls within the scope of rights.

1 제1 레이저 다이오드 21, 22 1x2 광커플러
31, 32 감쇠기 4 밸런스 포토 다이오드
5 반도체 광증폭기 6 음향 광학 변조기
7 제2 레이저 다이오드 8 전광 증폭기
91, 92 서큘레이터 10 FBG 필터
11 1480 WDM 커플러 12 C/L WDM 커플러
13 1x2 광학 스위치 14 센싱 대상 광섬유
15 안티스톡스 출력 단자 16 스톡스 출력 단자1 1st laser diode 21, 22 1x2 optocoupler
31, 32 Attenuator 4 Balanced Photodiode
5 Semiconductor optical amplifier 6 Acousto-optic modulator
7 Second laser diode 8 Optical amplifier
91, 92 Circulator 10 FBG Filter
11 1480 WDM coupler 12 C/L WDM coupler
13 1x2 optical switch 14 sensing target optical fiber
15 Anti-Stokes output terminal 16 Stokes output terminal

Claims (3)

분포형 음향 센서용 광을 발진하는 제1 레이저 다이오드,
상기 제1 레이저 다이오드가 출력한 광을 신호 출력광과 기준광으로 분기하는 제1 커플러,
상기 기준광을 소정의 세기로 감쇠하는 제1 감쇠기,
상기 제1 감쇠기를 거친 상기 기준광을 수신하는 밸런스 포토 다이오드,
상기 신호 출력광을 소정의 세기로 감쇠하는 제2 감쇠기,
상기 제2 감쇠기를 거친 상기 신호 출력광을 증폭하고 광펄스로 변환하는 반도체 광증폭기,
상기 광펄스로 변환된 신호 출력광의 주파수를 변조하여 분포형 음향 센서용 광펄스를 생성하는 음향 광학 변조기,
분포형 온도 센서용 광펄스를 발진하는 제2 레이저 다이오드,
상기 분포형 온도 센서용 광펄스와 상기 분포형 음향 센서용 광펄스를 혼합하여 혼합 광신호를 출력하는 제2 커플러,
상기 혼합 광신호를 소정의 세기로 증폭하는 전광 증폭기,
특정 파장 대역의 광만 반사하고, 나머지는 통과시키는 FBG 필터,
상기 전광 증폭기로부터 입사하는 광을 상기 FBG 필터로 전달하고, 상기 FBG 필터로부터 반사되어 입사하는 광을 제3 단자를 통해 출력하는 제1 서큘레이터,
상기 제1 서큘레이터의 상기 제3 단자에 연결되어 있고, 상기 제1 서큘레이터로부터 입사하는 광을 제1 출력 단자를 통해 출력하고, 상기 제1 출력 단자로부터 입사하는 광은 상기 밸런스 포토 다이오드로 전달하는 제2 서큘레이터,
상기 제2 서큘레이터의 상기 제1 출력 단자에 연결되어 있는 제1 단자, 센싱 대상 광섬유에 연결되어 있는 제2 단자, 그리고 제3 단자를 가지는 광학 스위치,
상기 FBG 필터의 출력단과 상기 광학 스위치의 제3 단자 사이에 직렬로 연결되어 있는 1480 WDM 커플러 및 C/L WDM 커플러
를 포함하고,
상기 밸런스 포토 다이오드는 상기 증폭된 혼합 광신호 중 상기 FBG 필터에서 반사된 후 상기 제1 및 제2 서큘레이터와 상기 광학 스위치를 통해 상기 센싱 대상 광섬유로 입사한 상기 분포형 음향 센서용 광펄스의 성분이 상기 센싱 대상 광섬유에서 산란되어 상기 광학 스위치와 상기 제2 서큘레이터를 통해 반송된 측정광을 상기 제1 감쇠기를 통해 입사한 기준광과 결합하여 간섭 무늬를 생성하고,
상기 C/L WDM 커플러는 상기 증폭된 혼합 광신호 중 상기 FBG 필터를 통과하여 상기 센싱 대상 광섬유로 입사한 후 상기 센싱 대상 광섬유에서 산란되어 반송되는 온도 센서용 광펄스의 산란광의 라만 산란광 중의 장파장 대역인 스톡스 광신호만 걸러서 스톡스 측정 단자로 출력하고, 나머지 산란광은 상기 1480 WDM 커플러로 전달하며, 상기 1480 WDM 커플러는 상기 라만 산란광 중 단파장 대역인 안티스톡스 광신호만을 걸러서 안티스톡스 측정 단자로 출력하는
온도와 진동 측정을 위한 광섬유 센서 시스템.A first laser diode that oscillates light for a distributed acoustic sensor,
A first coupler that splits the light output from the first laser diode into signal output light and reference light,
A first attenuator that attenuates the reference light to a predetermined intensity,
A balanced photo diode that receives the reference light that has passed through the first attenuator,
a second attenuator that attenuates the signal output light to a predetermined intensity;
a semiconductor optical amplifier that amplifies the signal output light that has passed through the second attenuator and converts it into an optical pulse;
An acousto-optic modulator that generates an optical pulse for a distributed acoustic sensor by modulating the frequency of the signal output light converted into the optical pulse,
A second laser diode that oscillates optical pulses for a distributed temperature sensor,
A second coupler that mixes the optical pulse for the distributed temperature sensor and the optical pulse for the distributed acoustic sensor to output a mixed optical signal,
An electro-optical amplifier that amplifies the mixed optical signal to a predetermined intensity,
FBG filter, which reflects only light in a specific wavelength band and passes the rest,
A first circulator that transmits light incident from the electro-optical amplifier to the FBG filter and outputs light reflected from the FBG filter and incident through a third terminal,
It is connected to the third terminal of the first circulator, and outputs light incident from the first circulator through a first output terminal, and light incident from the first output terminal is transmitted to the balance photo diode. A second circulator,
An optical switch having a first terminal connected to the first output terminal of the second circulator, a second terminal connected to a sensing target optical fiber, and a third terminal,
1480 WDM coupler and C/L WDM coupler connected in series between the output terminal of the FBG filter and the third terminal of the optical switch
Including,
The balance photodiode is a component of the optical pulse for the distributed acoustic sensor that is reflected from the FBG filter among the amplified mixed optical signals and then incident on the sensing target optical fiber through the first and second circulators and the optical switch. The measurement light scattered from the sensing target optical fiber and returned through the optical switch and the second circulator is combined with the reference light incident through the first attenuator to generate an interference pattern,
The C/L WDM coupler is a long-wavelength band of the Raman scattered light of the scattered light of the optical pulse for the temperature sensor that passes through the FBG filter of the amplified mixed optical signal and enters the sensing target optical fiber and is then scattered and returned from the sensing target optical fiber. Only the in-Stokes optical signal is filtered and output to the Stokes measurement terminal, the remaining scattered light is transmitted to the 1480 WDM coupler, and the 1480 WDM coupler filters only the anti-Stokes optical signal in the short wavelength band among the Raman scattered light and outputs it to the anti-Stokes measurement terminal.
Fiber-optic sensor systems for temperature and vibration measurements. 제1항에서,
상기 FBG 필터는 온도를 조절하여 반사하는 파장 대역을 조정할 수 있는 온도와 진동 측정을 위한 광섬유 센서 시스템.In paragraph 1:
The FBG filter is an optical fiber sensor system for measuring temperature and vibration that can adjust the reflected wavelength band by adjusting the temperature. 제2항에서,
상기 광학 스위치는 설정된 시간에 맞춰 상기 제2 서큘레이터와 상기 센싱 대상 광섬유 사이를 연결하는 음향 센서용 광경로를 설정하거나 상기 C/L WDM 커플러와 상기 센싱 대상 광섬유 사이를 연결하는 온도 센서용 광경로를 설정하는 온도와 진동 측정을 위한 광섬유 센서 시스템.In paragraph 2,
The optical switch sets an optical path for an acoustic sensor connecting between the second circulator and the sensing target optical fiber at a set time, or an optical path for a temperature sensor connecting between the C/L WDM coupler and the sensing target optical fiber. Fiber optic sensor system for measuring temperature and vibration.
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KR101334364B1 (en) 2012-12-20 2013-12-05 한국광해관리공단 Distributed fiber optic sensor system capable of simultaneous measurement of temperature and strain
KR101817295B1 (en) 2016-07-20 2018-01-10 한국광기술원 Fiber-Optic Distributed Acoustic Sensor
JP2021515902A (en) 2019-01-23 2021-06-24 深▲セン▼供電局有限公司Ｓｈｅｎｚｈｅｎ Ｐｏｗｅｒ Ｓｕｐｐｌｙ Ｂｕｒｅａｕ Ｃｏ．， Ｌｔｄ． Temperature measurement system for high-temperature superconducting cables

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KR101724828B1 (en) * 2015-04-13 2017-04-10 한국표준과학연구원 Fiber Optic Interferometric Sensor with FBG for Simultaneous Measurement of Sound, Vibration and Temperature and Method for Sensing thereof

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KR101334364B1 (en) 2012-12-20 2013-12-05 한국광해관리공단 Distributed fiber optic sensor system capable of simultaneous measurement of temperature and strain
KR101817295B1 (en) 2016-07-20 2018-01-10 한국광기술원 Fiber-Optic Distributed Acoustic Sensor
JP2021515902A (en) 2019-01-23 2021-06-24 深▲セン▼供電局有限公司Ｓｈｅｎｚｈｅｎ Ｐｏｗｅｒ Ｓｕｐｐｌｙ Ｂｕｒｅａｕ Ｃｏ．， Ｌｔｄ． Temperature measurement system for high-temperature superconducting cables

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