德国著名电子产品制造厂家森海塞尔与以色列PHone-Or公司合作开发成功的光话筒是将LED发出的光以一定角度照射在振膜上,而在另一侧装有接收反射光的检测器件。当膜片振动时,反射至光敏器件上的光强度也随之改变,从而改变光电流的强度,产生不同的声音响度。 Well-known German electronics manufacturer Sennheiser and Israel’s PHone-Or company to develop a successful optical microphone is LED light emitted at a certain angle on the diaphragm, and on the other side with the detection device to receive the reflected light . When the diaphragm vibrates, the intensity of the light reflected on the photosensitive device also changes, thereby changing the intensity of the photocurrent to produce different acoustic loudness.