• Title/Summary/Keyword: Fiber Optic Sensor Array

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Investigation of the Acoustic Detection in Transformer Oil Using Sagnac Fiber Optic Sensor Array (Sagnac형 광섬유 배열센서를 이용한 유증 음답 탐지 연구)

  • Lee, Jog-Kil;Lee, Seung-Hong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2010.10a
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    • pp.533-534
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    • 2010
  • Fiber optic sensor has bee widely used in the industrial applications. For the application of acoustic detection of the high voltage electric transformer Sagnac interferometer can be used. In this paper several different materials of mandrel were used in the fiber sensor array. Based on the transformer oil fiber optic sensor is more sensitive than in the air.

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Sound Measurements of the Discharge Break Down Using Fabry-Perot Sensor Array (Fabry-Perot형 광섬유 배열센서의 방전 음압 계측)

  • Lee, Jong-Kil;Lee, June-Ho;Lee, Jin-Woo
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.770-773
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    • 2003
  • To measure discharge breakdown acoustic signal, Fabry-Perot interferometer fiber optic sensor is used. Fiber optic sensor array can measure the partial discharge acoustic signal caused by defect of power facilities such as power cables, transformers and gas insulation. Fabry-Perot interferometer is selected as an fiber optic sensor array. It is shown that Fabry-Perot fiber optic sensor array detected discharge breakdown acoustic signal, effectively.

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Lateral direction acoustic detection of fiber optic sensor array using Fabry-Perot (Fabry-Perot을 이용한 두 개의 광섬유 센서배열의 횡방향 음압 감지 특성)

  • Lee, Jong-Kil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.342-345
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    • 2005
  • To detect external acoustic signal, fiber optic sensor array using Fabry-Perot interferometer which had benefit of minimize and light-weight was used. The sensor head has 1cm in length, total length of fiber is 9.5cm, and the sensor supported at both ends, simply. External sound applied in lateral direction and detected two signals were compared each other. It was confirmed that the Fabry-Perot interferometric sensor array detected acoustic signal, effectively.

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Applied Sound Frequency Monitoring in the Transformer Oil Using Fiber Optic Sagnac Interferometer (사냑형 간섭계 광섬유 센서를 이용한 변압기유 내에서의 외부 음향 주파수 모니터링)

  • Lee, Jongkil;Lee, Seunghong
    • The Journal of the Acoustical Society of Korea
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    • v.34 no.4
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    • pp.288-294
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    • 2015
  • The fiber optic Sagnac interferometer is well established as a sensor for detection of physical perturbations such as acoustic and vibration. In this paper acoustic signals generated in the cylindrical cavity submerged in transformer oil were measured by the fiber optic sensor array in one Sagnac loop. Two different external sound frequencies, $f_1$ and $f_2$, were applied to the sensor array simultaneously by using piezoelectric with frequency range from 5 kHz to 90 kHz. Based on the experimental results, fiber optic sensor detected harmonic series of applied sound frequency such as $f_1$, $f_2$, $2f_1$, $2f_2$, ${\mid}f_1-f_2{\mid}$, ${\mid}f_1+f_2{\mid}$. Suggested fiber optic sensor array can be applied to monitor physical quantities such as internal sound pressure and vibration due to partial discharge in the real electric transformer system.

Investigation of the Lateral Acoustic Signal Detection Using by Two Fabry-Perot Fiber Optic Sensor Array (두 개의 Fabry-Perot 광섬유 센서 배열을 이용한 횡방향 음압 감지 특성 연구)

  • Lee, Jong kil
    • 대한공업교육학회지
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    • v.31 no.1
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    • pp.185-199
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    • 2006
  • In this paper, to detect lateral direction sound pressure fiber optic sensor using Fabry-Perot interferometeric sensor array was fabricated and experimented. This parallel sensor array composed of one light source and the light split into each sensor using directional coupler and to see the output signal the array system do not need any digital signal processor. As a lateral direction sound source arbitrary sound frequency of 100Hz, 200Hz, and 655Hz using by nondirectional speaker were applied to the array sensor which installed on $60cm{\times}60cm{\times}60cm$ latticed structure. The detected signals from the two sensors were analyzed in the time and frequency domains. It was confirmed that the suggested sensor array detected applied sound source well but there were a little amplitude differences in between the sensors. Because the sensor supported simply at both ends theoretical analysis was performed and its solution was suggested. To compare the theoretical and experimental results arbitrary sound frequency of 2kHz was applied to the sensor array. It shows that experimental results was good agreement with theoretical results.

Fiber-Optic Sensors

  • 김병운
    • Proceedings of the Optical Society of Korea Conference
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    • 1988.06a
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    • pp.104-104
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    • 1988
  • Single-mode 광섬유를 이용한 Sersor 및 그와 관련된 광섬유 device 의 작동원리 및 연구동향에 대하여 논의하였다. 논의된 광섬유 sersor 로는 intensity type sersor, fiber gyroscope, sensor array 등이 포함되어 있고, 관련 부품으로는 directional coupler, acousto-optic, fiber-optic amplifier 등이 설명되었다.

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Characteristics of 2-Channel TDM fiber-optic sensor array (TDM 방식의 2채널 광섬유 센서 배열 특성 연구)

  • Lee, Jong-Kil
    • Journal of Sensor Science and Technology
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    • v.7 no.5
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    • pp.306-312
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    • 1998
  • To develop the multi-channel fiber-optic sensor array system, two-channel TDM(Time Division Multiplexing) fiber-optic sensor array was constructed and characterized. The sensor array topology was Mach-Zehender ladder type and PMDI(Phase-Matched Differential Interferometer) technique was used to exploit the efficiency of the array signal processing. By using a synthetic heterodyne demodulation technique, outputs of the two channels were monitored simultaneously. The sensitivities of channel #1 and #2 were measured ${\sim}60{\mu}rad/\sqrt{Hz}$ and ${\sim}80{\mu}rad/\sqrt{Hz}$, respectively. Crosstalk of sensors in the array was found to be approximately -36dB. Based on the results, we could conclude that TDM Mach-Zehnder ladder type sensor array can be used to detect the acoustic signal with stability and efficiency of the sensor array.

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Characteristics of Underwater Sound Detection of the Fiber Optic Hydrophone Array (광섬유 하이드로폰 배열의 수중음향 감지특성 연구)

  • Lee, Jong-Kil
    • Journal of Sensor Science and Technology
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    • v.8 no.2
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    • pp.102-107
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    • 1999
  • In this paper, to develop the fiber optic hydrophone for the use of low frequency applications, two channels TDM(Time Division Multiplexing) fiber-optic hydrophone array was fabricated and their acoustic charateristics were investigated in the acoustic water tank. A fiber length of the order of 150m is wounded at the hollow cylinder type aluminum mandrel and the fundamental natural frequency of the mandrel maintained above 10kHz. An unbalanced interferometer (discrete Mach-Zehnder type) was used. Sound detection performance is tested in the underwater tank with 3kHz continuous sound source. Finally, it is shown that two channels TDM fiber-optic hydrophone array can detect 3kHz sound stably. This results can also applicable for the development of multi-channel fiber optic hydrophone array.

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A Fiber Laser Spectrometer Demodulation of Fiber Bragg Grating Sensors for Measurement Linearity Enhancement

  • Kim, Hyunjin;Song, Minho
    • Journal of the Optical Society of Korea
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    • v.17 no.4
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    • pp.312-316
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    • 2013
  • A novel fiber-optic sensor system is suggested in which fiber Bragg grating sensors are demodulated by a wavelength-sweeping fiber laser source and a spectrometer. The spectrometer consists of a diffraction grating and a 512-pixel photo-diode array. The reflected Bragg wavelength information is transformed into spatial intensity distribution on the photo-diode array. The peak locations linearly correspond to the Bragg wavelengths, regardless of the nonlinearities in the wavelength tuning mechanism of the fiber laser. The high power density of the fiber laser enables obtaining high signal-to-noise ratio outputs. The improved demodulation characteristics were experimentally demonstrated with a fiber Bragg grating sensor array with 5 gratings. The sensor outputs were in much more linear fashion compared with the conventional tunable band-pass filter demodulation. Also it showed advantages in signal processing, due to the high level of photo-diode array signals, over the broadband light source system, especially in measurement of fast varying dynamic physical quantities.