Optical Measurement of Sound Field by Laser Differential Interferometry

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  • 120 レーザー差動干渉法による音場の光学計測
  • レーザーサドウ カンショウケイ ニヨル オンジョウ ノ コウガク ケイソク

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Abstract

Laser differential interferometry using two laser beams of perpendicular polarization is applied to sound pressure measurements. The weak density difference due to the sound wave no more than 70dB between the two beams is measurable in proportional to the differential output signal of the two photo detecters. Both steady and transient sound wave signals are obtained by our interferometer as clearly as by microphone. Acoustic vibration of the optical systems and the way of sound visualization in future are also discussed.

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