• Title/Summary/Keyword: Fiber Optic Sensor Array

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Characterization of a Fiber-optic Interferometric Sensor Array (광섬유 간섭계형 센서 어레이의 구성 및 특성 조사)

  • 안준태;김병윤
    • Korean Journal of Optics and Photonics
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    • v.5 no.1
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    • pp.152-157
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    • 1994
  • A fiber-optic interferometric sensor array capable of passive remote sensing is demonstrated with two sensors at the array head. The signal from a specific sensor could be separated in time domain. The measured sensitivity at signal frequencies of a few kHz and cross talk level between two sensors were about $40{\mu}rad\sqrt{Hz}$and below - 50 dB, respectively.tively.

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Temperature Measurement Using Single-Mode Fiber Interferometric Sensor (단일모드 광섬유의 간섭계 센서를 이용한 온도측정)

  • 김덕수;이상호
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.22 no.2
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    • pp.1-5
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    • 1985
  • In this paper, temperature-induced optical phase shifts in single-mode fibers are studied both analytically and experimentally. Temperature sensor using single-mode fiber interferometer is designed and the temperature sensitivity of the sensor system is investigated. This fiber-optic temperature sensor which employs the Mach-Zehnder arrangement is a high sensitivity sensor of phase detection type. In this type, temperature changes are ob-served as a motion of an optical interference fringe pattern. In the measurements using interferometer, one of the important problems is to detect simultaneously the number and direction of fringe displacement resulting from physical perturbations (temperature, pressure, etc.). To realize this, the array detector using multi-mode fiber is designed. By this array detector the number and direction of fringe displacement is Ineasured very conveniently.

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Fiber-Optic Interferometric Sensor System for Remote Sensing and Its Application to Pressure Sensing (원격 측정을 위한 간섭형 광섬유 센서 시스템과 그의 압력 센서 응용)

  • Yeh, Yun-Hae;Jung, Hwan-Soo;Lah, Doh-Sung
    • Journal of Sensor Science and Technology
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    • v.6 no.3
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    • pp.172-179
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    • 1997
  • This paper describes a multiplexed-multivariate fiber-optic interferometric sensor system with remote sensing capability. Signal processor of the implemented sensor system is designed as a digital fringe counter that is well adapted to the signal processing of the remote fiber-optic Fabry-Perot interferometric sensor array. By summing up the reported optical data of the optical fiber, a guideline for choosing the optical effect suitable for a specific measurand is presented. As an example, a pressure sensing device that utilizes the strain-optic effect of the optical fiber by attaching it onto a stainless steel diaphragm of which diameter is 4.3 cm, is built and attached to the sensor system. The changes in optical phase difference of the fiber-optic Fabry-Perot interferometric press ure sensor while filling a water tank 2 meters high, was counted by the half-fringe counting signal processor. Test results showed that the measurement error is less than ${\pm}3.6\;cm$ over the measured range of 2 meters.

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A Quasi-Distributed Fiber-Optic Sensor System using an InGaAs PD Array and FBG Sensors for the Safety Monitoring of Electric Power Systems (InGaAs PD 어레이와 광섬유 격자를 이용한 준분배형 전력설비 안전진단 시스템)

  • Kim, Hyun-Jin;Park, Hyoung-Jun;Song, Min-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.2
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    • pp.86-91
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    • 2010
  • We constructed a quasi-distributed fiber-optic sensor network for the safety monitoring in power systems. It is possible to construct many of FBG sensors in a line and to be immune from electromagnetic noise. For demodulation analysis of reflected wavelength from FBG sensor, we proposed a simple and fast system using a InGaAs photo-diode array and a holographic diffraction grating. For accuracy improvement of the proposed demodulation system, we applied a Gaussian line-fitting algorithm. We obtained about 4[pm] of wavelength resolution and stability.

Position Estimation of Sound Source Using Three Optical Mach-Zehnder Acoustic Sensor Array

  • Hwang, Jeong-hwan;Seon, Seokpyeong;Park, Chang-Soo
    • Current Optics and Photonics
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    • v.1 no.6
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    • pp.573-578
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    • 2017
  • Position estimation of a sound source based on time difference of arrival at an array of three acousto-optic sensors is introduced. Each sensor consists of a Mach-Zehnder interferometer including a sensing part in one arm that is a piece of fiber surrounded by membrane in order to enhance the acousto-optic effect. Estimation error of a recorded gunshot sound signal was evaluated with the theoretically calculated values for two different locations.

A Study on Implementation of Line Array Sensor Data Processing Platform Using PowerPC and Vxworks (PowerPC 및 VxWorks를 이용한 예인선배열센서 데이터처리 플랫폼 구현에 관한 연구)

  • Lim, Byeong-Seon;Kim, Young-Kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.7
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    • pp.1603-1609
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    • 2010
  • This Paper deals with a design, making a prtotype and test methods of Real-time towed Line Array Sensor Data processing board for fast data communication and long range data transmission with SFM(Serial FPDP Module) through Optic-fiber channel. Towed line array sensors are installed in Frigate and the each LAS A, B, C group data from LAS is packed a previously agreed protocol and transmitted to the signal processing unit. Considering the limited space of VME 6U size, LAS Data processing board is designed with MPC8265 PowerPC Controller of Freescale for main system control and Altera's CycloneIII FPGA for sensor data packing, self-test simulation data generation, S/W FIFO et cetera. LAS Data processing board have VxWorks, the RTOS(Real Time Operating System) that present many device drivers, peripheral control libraries on board for real-time data processing.

A study on the low-frequency of acoustic sensor using single mode FBG (Fiber Bragg Grating). (단일모드 광섬유 브래그 격자를 이용한 저주파수 대역의 음향 센서에 관한 연구)

  • Kim, Kyung-Bok;Kwack, Kae-Dal
    • Journal of Sensor Science and Technology
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    • v.9 no.6
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    • pp.396-403
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    • 2000
  • The low- frequency acoustic sensor using the recently developed FBG has an excellent merits which the existing fiber-optic sensor has and also it has an excellent signal sensing effect in the environment of low-frequency($30Hz{\sim}300Hz$). Furthermore, we can expect the utilization of low-frequency signal defection instead of existing microphones in the environment of electric noise and also it can be developed as the high-sensibility multiplexing through the sensor array system.

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Linear Interrogation of Distributed Fiber Grating Temperature Sensor Network using a Fabry-Perot ITU Filter (Fabry-Perot ITU 필터의 기준파장을 이용한 분배형 광섬유 격자 온도센서의 선형복조)

  • Park, Hyoung-Jun;Song, Min-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.7
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    • pp.54-60
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    • 2007
  • We constructed a fiber-optic temperature sensor system using a sensor array with 15 fiber Bragg gratings for distributed temperature monitoring in electrical power systems. A polynomial fitting algorithm was used to compensate the nonlinear action of the MEMS tuneable wavelength filter used for Bragg wavelength demodulation Fixed passband wavelengths from a Fabry-Perot ITU filter were used as reference wavelengths for the fitting algorithm which obtained constant accuracy regardless of the wavelength scanning range and frequency. About 0.18[%] of linearity error compared to reference thermocouple thermometer has been obtained in the preliminary experimental results.

A Design of LAS data processing board using PowerPC and VxWorks (PowerPC 및 VxWorks를 이용한 예인배열센서 데이터처리보드 개발)

  • Lim, Byeong-Seon;Kim, Young-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.10a
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    • pp.371-374
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    • 2009
  • This Paper deal with a design, making a prtotype and test methods of Real-time towed Line Array Sensor Data processing board for fast data communication and long range transmission with SFM(Serial FPDP Module) through Optic-fiber channel. The LAS A,B,C group Data from towed line array sensor which is installed in FFX(Fast Frigate eXperimental) of Korean Navy is packed a previously agreed protocol and transmitted to the Signal processing unit. Consider the limited space of VME 6U size, LAS Data processing board is designed with MPC8265 PowerPC Controller of Freescale for main system control and Altera's CycloneIII FPGA for sensor data packing, self-test simulation data generation, S/W FIFO et cetera. LAS Data processing board have VxWorks, the RTOS(Real Time Operating System) that present many device drivers, peripheral control libraries on board for real-time data processing.

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