<論文>ファイバグレーティングの光マイクへの応用

概要

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We have fabricated an optical microphone using a fiber Bragg grating (FBG) and measured its several characteristics. The fabricated microphone has a structure that an end of FBG is bonded to a vibration membrane. So, shift of Bragg reflection wavelength can be induced when the membrane vibrates with an input sound pressure, resulting in a change of the reflected optical power. It was confirmed that the optical output signal increased in proportion to the sound pressure. Good frequency response and directivity were also obtained. We studied the possibility of improving the frequency response of an optical microphone. The improvement was carried out changing the material of the vibration membrane from a conventional tracing paper to a liquid crystal polymer film. It was experimentally shown that the liquid crystal polymer film was quite effective as the membrane of an optical microphone.
東海大学の論文
2002-09-30