Optical fiber microphone of laser ring cavity

Abstract

The invention relates to an optical fiber microphone of a laser annular cavity. The microphone comprises a fiber laser source, an erbium-doped fiber, an FFP filter, a coupler connected with the FFP filter, an optical fiber coil and a data acquisition part, wherein the optical fiber laser source generates continuous laser to form an optical signal which can only be transmitted in one direction after the laser passes through an isolator, and then the optical signal is amplified by the erbium-doped optical fiber, and is finally transmitted to the optical fiber coil; the optical fiber coil is formed by winding an optical fiber with the length of more than one thousand meters, serves as a voice signal sensing device and is transmitted back to the optical fiber laser source through the coupler and the FFP filter, and the coupler is used for converting an optical signal and an electric signal, converting the signal through the coupler and obtaining a voice signal through the data acquisitionpart.

Description

technical field [0001] The invention relates to an optical fiber sensor and a microphone of an optical fiber ring cavity laser, and belongs to the field of optical fiber lasers. Background technique [0002] Fiber lasers have outstanding advantages in solid-state lasers, including: good beam quality, high conversion efficiency, tunable wavelength, low laser threshold, no optical lens in the resonator, no need for thermoelectric cooling and water cooling, etc., in optical fiber communication, optical fiber transmission Sensing, long-distance communication, military and national defense, and medical machinery and many other fields have been relatively mature applications, and have also attracted extensive attention from researchers at home and abroad. [0003] Optical fiber microphone technology is an instrument for detecting acoustic signals, which utilizes the characteristics of optical fiber transmission light and the modulation effect of acoustic signals in the surrounding...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the common problem in these technologies is that the system will suffer from the instability of the transmission fiber, low sensitivity and the inability to detect weak signals, and the sensitivity of the traditional high-sensitivity fiber optic microphone is -62dBre1nm / Pa, and some environments have static pressure changes , will cause problems such as failure of the signal collected by the fiber optic microphone

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