Optical fiber disturbance detection method and device

Abstract

The invention discloses an optical fiber disturbance detection method. According to the method, in the measuring process, segmentation frequency scanning is performed, a scattering curve of he same frequency light is used for measuring dynamic disturbance, correlation detection is performed on the distribution curve, obtained through K-set measurement, of the light power of backward Rayleigh scattering light of any point on a sensor fiber along with the frequency and the distribution curve, obtained through first-set measurement, of the light power of backward Rayleigh scattering light of the corresponding point along with the frequency so as to measure quasi-static disturbance, and therefore simultaneous measurement of dynamic disturbance signals and quasi-static disturbance signals is achieved, and the measuring function and application range of a full-distributed type optical fiber sensor are greatly expanded. The invention further discloses an optical fiber disturbance detection device. The device in a measuring system is simple in structure and low in cost, the measuring time is much shorter than the dynamic and quasi-static disturbance measuring time performed by utilizing two sets of systems, and the continuous measurement of dynamic and quasi-static disturbance can be achieved.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an optical fiber disturbance detection method and device. Background technique [0002] With the development of optical fiber communication, especially the rapid development of backbone transmission network, passive optical network and optical fiber access technology, the role of optical fiber cable in the field of communication is becoming more and more important. In today's information age, the unexpected interruption of communication caused by damage to optical fiber cables will cause immeasurable losses. In order to reduce the loss as much as possible, it is urgent to establish a safety protection system for the optical cable line, which can detect the abnormal situation and its location in the optical cable as soon as possible, so as to report to the police, prevent and repair in time, and minimize the loss. [0003] The phase-sensitive optical time-domain reflectometry...

AI Technical Summary

Problems solved by technology

However, due to the need for frequency sweeping and other reasons, it takes a long time, this solution is not suitable for measuring high-frequency disturbances

[0005] In real life, there may be high-frequency dynamic disturbances or quasi-static disturbances for optical fiber disturbances. Quasi-static disturbances are slow-changing disturbances such as strain and temperature changes. At present, there is no technology that can measure these two different disturbances at the same time. How to overcome The insufficiency of the existing technology has become a key problem to be solved urgently in the field of optical fiber sensing

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