Optical fiber vibration detection device and method

Abstract

The invention discloses an optical fiber vibration detection device and method. The device comprises a laser device, a first optical processing circuit, a second optical processing circuit and a first optical fiber amplifier. The first optical processing circuit modulates and amplifies light source signals generated by the laser device, a first wavelength division multiplexer of the second optical processing circuit obtains the light source signals modulated and amplified by the first optical processing circuit, and the first optical fiber amplifier amplifies the light source signals obtained by the first wavelength division multiplexer, so the first wavelength division multiplexer transmits the light signals amplified by the first optical fiber amplifier to the outside of the optical fiber vibration detection device and receives light signals returned from the outside of the optical fiber vibration detection device. A first photoelectric detector of the second optical processing circuit converts the returned light source signals and outputs corresponding analog signals. Thus, the optical fiber vibration detection device and method can improve optical fiber output power so that a sensing distance can be increased, and a sensing result is relatively accurate.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber vibration detection device and method. Background technique [0002] The existing optical fiber sensing system acts on the external disturbance signal on the optical fiber. According to the photoelastic effect, it causes the phase change of the transmitted light in the optical fiber. Through the interference method, two interference light interference signals containing external disturbance information are obtained. The interference signal is processed by photoelectric conversion, amplification, A / D conversion, etc., and a digital signal containing external disturbance information is obtained. Usually, a server is set up on the monitoring side to process the obtained optical interference signal, digital signal, etc., so as to realize the detection of the optical fiber sensing vibration source. However, the transmission distance of optical fibers in...

AI Technical Summary

Problems solved by technology

However, the transmission distance of optical fibers in such systems is limited by spontaneous emission and harmful nonlinear effects, and ordinary optical fiber sensing systems usually have short sensing distances

However, increasing the sensing distance of the fiber optic sensing system through cascade amplification is complex and expensive

Therefore, the sensing distance of the existing optical fiber sensing system is limited by the output power of the optical fiber, and inaccurate sensing results are prone to occur in systems formed by laying optical fibers over long distances

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