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http://dx.doi.org/10.7776/ASK.2011.30.1.033

Investigation of Sound Pressure Detection of Fiber Optic Sensor in Transformer Oil According to TLS and CW Laser Source  

Lee, Jong-Kil (안동대학교 기계교육과)
Publication Information
The Journal of the Acoustical Society of Korea / v.30, no.1, 2011 , pp. 33-41 More about this Journal
Abstract
To substitute TLS in the hybrid system which is combined with Sagnac interferometer and fiber bragg grating (FBG) it is necessary to investigate how the laser source (TLS and CW) and sensor material variate the response of fiber optic sensor. Two different hollow cylinder type mandrel materials are proposed which are PTFE and PTFE+carbon and 18 m optical fiber is wounded at the mandrel surface. CW laser source experiments had been done in the oil tank which is filled with transformer oil in the 1 kHz~20 kHz frequency range. Also Sagnac interferometer fiber optic sensor is combined with FBG called hybrid system and TLS used as a light source. Based on the experimental results PTFE sensor showed more higher magnitude of detection signal rather than carbon sensor and this result is agreement with the McMahon's theoretical results. Phase variation is inversely proportional to the elastic modulus of the mandrel material. In PTFE fiber sensor, tunable laser source showed more higher performance rather than CW case. Therefore, TLS fiber optic sensor can be applied to the hybrid system which is combined with Sagnac and FBG.
Keywords
Fiber optic acoustic sensor; Sagnac interferometer; Fiber Bragg Grating; Mandrel; Tunable laser source; Acoustic frequency spectrum;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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