| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical microphone capable of detecting a minute sound pressure difference.SOLUTION: An optical microphone according to the present disclosure includes: a light source 12; a diaphragm 11 which vibrates by receiving a sound pressure; a light guide body 13 having a predetermined transmission loss and transmitting reflected light from the diaphragm; and an optical detector 14 for receiving light emitted by the light guide body. The optical detector 14 outputs a signal voltage corresponding to the illuminance of received light.SELECTED DRAWING: Figure 1 |
