Abstract
This paper describes a new type of microphone which uses the total internal reflection at the curved interface between glass and air. The critical angle for total reflection changes by the refractive index of air, which depends on the air density. As the density changes by the sound pressure, the sound pressure is measurable by detecting the intensity of the reflected light from the total reflection area. The acoustical characteristics of a prototype of the proposed microphone using optical fibers as an optical transmission path are investigated experimentally. The experimental results show that although the sensitivity of the microphone is low in the present stage, it can be used for the measurement of great volume of sound. The microphone has no limitation in the frequency range in principle because the mechanical vibration is not used.
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