電気学会論文誌C(電子・情報・システム部門誌)
Online ISSN : 1348-8155
Print ISSN : 0385-4221
<システム・計測・制御>
半導体レーザの自己結合効果を利用したレーザマイクロホンによる音波検出
水嶋 大輔吉松 剛五島 敬史郎津田 紀生山田 諄
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2016 年 136 巻 7 号 p. 1021-1026

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Demand for inexpensive and wide band microphone for machine noise in factory and power station is increasing. However, frequency response is limited by diaphragm in conventional microphone. In this paper, a laser microphone based on self-coupling effect of the semiconductor laser is proposed. The laser microphone has a wide and flat frequency response. The features of the laser microphone do not need optical adjustment with simple optical system and not need post-processing by digital signal processing. The laser microphone can detect a sound wave and a human voice. This signal voltage is proportional to sound pressure and flat in frequency response in audible sound. This microphone has a omni-directivity in vertical direction.

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