Patent ID: 9197969
Filing Date: 2015-11-24
Classification: H04R,Y10T

Abstract:
1. An optical microphone, comprising: an acousto-optic medium section having a pair of principal surfaces and at least one lateral surface provided between the pair of principal surfaces; a restraint section which is in contact with the at least one lateral surface for preventing a shape change of the acousto-optic medium section; and a light emitting section for emitting a light wave so as to propagate through the acousto-optic medium section between the pair of principal surfaces, wherein the pair of principal surfaces are in contact with an environmental fluid through which an acoustic wave to be detected is propagating and are capable of freely vibrating, wherein the light wave comes into the acousto-optic medium section at a position which is equidistant from the pair of principal surfaces when seen along a direction perpendicular to the pair of principal surfaces and goes out from the acousto-optic medium section at a position which is equidistant from the pair of principal surfaces and an optical path length variation of a light wave propagating through the acousto-optic medium section, which is caused by the acoustic wave that comes into the acousto-optic medium section from at least one of the pair of principal surfaces and propagates through the acousto-optic medium section, is detected.