Patent ID: 8813571
Filing Date: 2014-08-26
Classification: G01H,H04R

Abstract:
1. An optical microphone for detecting an acoustic wave by using a light wave, the acoustic wave propagating in an ambient fluid, comprising: a propagation medium section for the acoustic wave to propagate through; a light source for emitting a light wave to be transmitted through a diffraction region in the propagation medium section; and a photoelectric conversion section for detecting the light wave having been transmitted through the propagation medium section and outputting an electrical signal, wherein, the optical microphone is configured: to allow a first acoustic wave and a second acoustic wave to propagate in antiparallel directions in the propagation medium section so as to simultaneously arrive at the diffraction region and traverse the light wave being transmitted through the diffraction region, the first acoustic wave being a portion of the acoustic wave and the second acoustic wave being at least a portion of the remainder; and to generate, in the diffraction region, a +1 the photoelectric conversion section detects at least one of: an interference component between a +1 another interference component between a −1