Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Sound Pressure Sensitivity Variation of the Hollow Cylinder Type Sagnac Fiber Optic Sensor According to the Mandrel Install Direction and Its Material

Sagnac형 광섬유 센서를 이용한 중공 원통형 맨드릴의 재료 및 설치 방향에 따른 음압 감지 변화 연구

  • 이종길 (안동대학교 기계교육과)
  • Received : 2012.03.16
  • Accepted : 2012.06.12
  • Published : 2012.07.20
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Abstract

In this paper, sound pressure sensitivity of the fiber optic acoustic sensor according to sensor direction and mandrel material were investigated experimentally. Three different directions were selected as stand, lay, and hole. Hollow cylinder type mandrel dimension is 30 mm in outer diameter, 45 mm in length, and 2 mm in thickness, and about 50 m optical fibers were wounded on the surface of the mandrel. Non-directional sound speaker was used as a sound source. Sagnac interferometer and single mode fiber, a laser with 1,550 nm in wavelength, $2{\times}2$ coupler were used. Based on the experimental results, lay direction's sensitivity is the highest in the frequency range of 2 kHz~4 kHz. 'PTFE+carbon' material is more sensitive than PTFE in the frequency range of 5 kHz~20 kHz. Sound pressure detection sensitivity depends on the mandrel direction and material under certain frequency.

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References

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