Optical fiber distributed perturbation sensor and method for implementing perturbation positioning

Abstract

The invention discloses an optical fiber distributed disturbance sensor, and a method, by which the disturbance sensor can achieve disturbance positioning. The method is characterized in that light path output signals from an interferometer are divided into three equal paths of light, pass through analyzers with polarization angle differences of 0 DEG, 60 DEG and minus 60 DEG respectively, enter a photo detector and are converted to electrical signals therein, are subjected to the square summing calculation after being conditioned by filtered signals and amplified signals, get rid of the DC amount by filtration, and are taken as the final interference output signals for related computation so that disturbance positioning can be carried out. The method can ensure the final interference signals always remain in a certain amplitude range and available, and the possibility of the signals being zero is zero. The invention solves the problem in the prior dual interferometer type distributed disturbance sensor that the sensor doesn't work when the amplitude of the light path output signals of the interferometer changes to zero because of the random variation of the polarization state of light wave.

Description

technical field [0001] The invention relates to an optical fiber sensor, in particular to an optical fiber distributed disturbance sensor and a method for realizing disturbance positioning. Background technique [0002] Optical fiber sensors are widely used in industrial, civil and military fields due to their excellent characteristics such as anti-electromagnetic interference, small size, light weight, high sensitivity, easy networking, and especially the ability to realize distributed measurement. Among them, the optical fiber distributed disturbance sensor is of great significance in the field of perimeter alarm, oil pipeline monitoring and other structural monitoring. [0003] At present, according to the difference of working principle, there are many types of optical fiber distributed sensors, such as interferometer type, fiber grating type, optical time domain reflectometer type, intensity modulation type and scattering type. Among them, the interferometer-type distr...

AI Technical Summary

Problems solved by technology

[0014] Due to the instability of the output signal amplitude of the interferometer, the sensor may fail to have no output signal within a certain time range, which affects the reliability of the sensor in actual monitoring applications.

Images