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2015 Vol.34, Issue 4 Preview Page
Applied Sound Frequency Monitoring in the Transformer Oil Using Fiber Optic Sagnac Interferometer

사냑형 간섭계 광섬유 센서를 이용한 변압기유 내에서의 외부 음향 주파수 모니터링

Jongkil Lee1*
,
Seunghong Lee2
이 종길1*
,
이 승홍2
1Department of Mechanical Engineering Education, Andong National University
2Department of Precision Mechanical Engineering, Graduate School, Andong National University
*교신저자. *Corresponding Author. 
31 July 2015. pp. 288-294
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Abstract

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, f1 and f2 , 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 f1, f2, 2f1, 2f2,ㅣf1-f2ㅣ,ㅣf1+f2ㅣ. 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.

Keywords
Fiber optic sensor
Sagnac interferometer
Acoustical measurement
Transformer oil

광섬유 사냑 간섭계는 음향 및 진동과 같은 물리적 변화량을 탐지하는 센서로 잘 개발되어 있다. 본 논문에서는 변압기유가 채워진 원통형 캐비티에 음압이 발생되었을 때 한 개의 루프내에 설치된 광섬유 배열 센서를 이용하여 음향을 탐지하였다. 서로 다른 외부 음향 주파수 f1과 f2를 피에조 재료를 이용하여 발생시키고 주파수는 5 kHz에서 90 kHz까지로 선정하였다. 실험 결과 광섬유 센서는 하모닉 성분인 f1, f2, 2f1, 2f2,ㅣf1-f2ㅣ,ㅣf1+f2ㅣ 의 주파수를 탐지하였다. 제안된 광섬유 센서 배열은 변압기 내의 부분 방전으로 인한 음압과 진동과 같은 물리량을 모니터링 하는데 적용할 수 있을 것으로 판단된다.

키워드
광섬유센서
사냑 간섭계
음향 측정
변압기유
References
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 34
  • No :4
  • Pages :288-294
  • Received Date : 2015-06-12
  • Accepted Date : 2015-06-22
  • DOI :https://doi.org/10.7776/ASK.2015.34.4.288
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