Barrier-searchable Brillouin optical time domain analyzer

Abstract

The invention discloses a barrier-searchable Brillouin optical time domain analyzer comprising a Brillouin optical time domain analyzing module, a detection optical fiber, an optical fiber barrier searching module and a branching unit module, wherein the branching unit module is provided with two optical signal input ports and one optical signal output port; the first output port of the Brillouin optical time domain analyzing module and the optical fiber barrier searching module are respectively connected with the two input ports of the branching unit module; the first output port of the Brillouin optical time domain analyzing module is connected with an input port of the detection optical fiber; and the optical signal output port of the branching unit module is connected with the optical signal input port of the detection optical fiber. The device disclosed by the invention has a simple structure and can accurately detect the position of a breaking point of the optical fiber when the optical fiber is broken.

Description

technical field [0001] The invention relates to an optical fiber Brillouin optical time domain analyzer, in particular to an obstacle-seeking Brillouin optical time domain analyzer. Background technique [0002] As a new sensing technology developed in the 1970s, optical fiber sensing has many advantages compared with conventional sensors: anti-electromagnetic interference, electrical insulation, corrosion resistance, high sensitivity, light weight, small size, variable shape, and low cost Wait. In the field of optical fiber sensing, distributed optical fiber sensors make full use of the characteristics of continuous distribution of optical fiber in one-dimensional space, and can accurately measure the time and space information of the measured field (temperature, stress, vibration) at any point along the optical fiber. Distributed, it can sense, remotely monitor and monitor every part of large-scale infrastructure facilities like the human nervous system. [0003] The Bri...

AI Technical Summary

Problems solved by technology

However, since the optical signal received by the detector in the Brillouin optical time domain analyzer is emitted by the light source at the other end, when the detection fiber is broken, the light emitted by the light source will not reach the detector. Therefore, the Brillouin optical time domain analyzer Not only will domain analyzers fail to detect fiber breaks, they will not work properly

Although the Brillouin optical time domain reflectometer (BOTDR) has the functions of distributed sensing and fault detection for optical fibers at the same time, its Brillouin backscattering intensity is extremely weak, and the measurement accuracy is far inferior to that of Brillouin optical time domain. domain analyzer

The patent with the application number 201010229974.9 discloses a device that adds an optical fiber fault-finding function to a loop-shaped optical fiber sensor. Multiple optical switches are used to control the working status of the optical fiber sensing and fault-finding module, but the biggest disadvantage of this method is The device is more complicated

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