Optical fiber vibration detection system and optical fiber vibration detection method

Abstract

The invention discloses an optical fiber vibration detection system and an optical fiber vibration detection method. An optical fiber vibration sensor is connected with a host computer, the optical fiber vibration sensor comprises a first circulator, N pumping light sources, and a first wavelength division multiplexer, the first circulator is connected with the first wavelength division multiplexer, the N pumping light sources are connected with the first wavelength division multiplexer, the first wavelength division multiplexer is connected to a remote gain module via a first sensing optical fiber, and the remote gain module is also connected with a second sensing optical fiber. Signal light emitted by the first circulator and pumping light emitted by the N pumping light sources enter the remote gain module via the first wavelength division multiplexer, and the pumping light is downloaded via the remote gain module for the amplification of the signal light. Therefore, the technical problem that the actual production requirement cannot be satisfied due to limited detection distance of the optical fiber vibration signal detection system is solved, and the accuracy of remote optical fiber vibration detection is improved.

Description

technical field [0001] The invention relates to the field of signal detection, in particular to an optical fiber vibration detection system and an optical fiber vibration detection method. Background technique [0002] Large-scale engineering structure health monitoring, oil pipeline protection, geological disaster prevention, etc. all need to collect vibration signals. The distributed optical fiber vibration sensor based on coherent Rayleigh technology (Φ-OTDR) has become a research hotspot because of its incomparable advantages over traditional sensors. . At present, this technology is mainly used in fence intrusion detection, long-distance oil and gas pipeline detection, border security and other fields, and has achieved good application results. However, with the extension of the detection distance, the optical signal becomes very weak, especially the backward Rayleigh The scattered light signal becomes extremely weak, which brings great difficulties to the detection of...

AI Technical Summary

Problems solved by technology

[0004] By providing an optical fiber vibration detection system and an optical fiber vibration detection method, the present invention solves the technical problems of resource waste and limited effect of prolonging the detection distance in the prior art

Images