High-fault-tolerance optical fiber microphone based on retro-reflection

Abstract

The embodiment of the invention provides a high-fault-tolerance optical fiber microphone based on retro-reflection. The high-fault-tolerance optical fiber microphone comprises a laser, an optical circulator, a photoelectric detector, a sensing probe main body shell, an optical fiber collimator, a retro-reflection material sheet, a vibrating diaphragm and a windproof, lightproof and sound-transmitting screen. A plurality of structures form the high-fault-tolerance optical fiber microphone based on retro-reflection in a reasonable form, wherein the retro-reflection material sheet can ensure thatthe light incident on the sheet returns to the light source from the reverse direction close to the incident light within a larger angle range, so that the light receiving efficiency is greatly improved, partial structure of the sensing probe is allowed to deviate, and the structure fault tolerance of the sensing probe is enhanced. The device is simple in structure, low in manufacturing cost, high in anti-interference capability, good in structure fault-tolerant capability and wide in detection frequency range.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular, it relates to a highly fault-tolerant optical fiber microphone based on retroreflection. Background technique [0002] Optical fiber microphone is a sensor that detects sound signals by using the light transmission characteristics of optical fibers and the modulation effect of sound on optical signals in optical fibers. Fiber optic microphones have the advantages of high sensitivity, wide linear range, and good frequency response characteristics, especially fiber optic microphones are passive devices, suitable for flammable and explosive places, and fiber optic microphones are resistant to electromagnetic interference, especially in the field of national defense security monitoring. unique advantage. The reflective intensity-modulated fiber optic microphone has the characteristics of simple structure and high detection sensitivity, and it is a hot research topic at home and ab...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional reflective modulation fiber optic microphone uses ordinary optical fiber to transmit and receive light, so the received modulated light signal is very weak and difficult to detect; in addition, it is reflected by the mirror mirror, and there is a small deflection in the sensor probe structure. Time-shifting, there is no guarantee that the light beam can return to the sensing fiber in the original path, resulting in the inability to receive the optical signal

Images