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Sound Detection Characteristics Using Fabry-Perot Fiber Optic Sensor which Simply Supported in Structure  

이종길 (안동대학교 기계교육과)
이진우 (호서대학교 전기정보통신학부)
이준호 (호서대학교 전기정보통신학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.22, no.7, 2003 , pp. 585-591 More about this Journal
Abstract
In this paper, fiber optic sensor 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 9.5 chi and the sensor supported at both ends, simply. To analyze the acoustic characteristic non-directional speaker is used as a sound source. Acoustic applied in lateral direction and detected two signals were compared each other. Below 1㎑ fiber optic sensor has more sensitive than microphone, but in 2㎑ fiber optic sensor has less sensitive than microphone. This characteristic varies to the supporting system of fiber optic sensor. It was confirmed that the Fabry-Perot interferometric sensor detected acoustic signal, effectively. This kind of sensor can be applied to the structural health monitoring field of intellectual structure.
Keywords
Fiber optic sensor; Fabry-Perot interferometer; Acoustic signal; Frequency spectrum;
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