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

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  • Sound Detection by Laser Microphone Using Self-coupling Effect of Semiconductor Laser
  • ハンドウタイ レーザ ノ ジコ ケツゴウ コウカ オ リヨウ シタ レーザマイクロホン ニ ヨル オンパ ケンシュツ

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抄録

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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