Distributed optical fiber vibration sensing system having attenuation real-time monitoring function

Abstract

The invention discloses a distributed optical fiber vibration sensing system with attenuation real-time monitoring function, which is characterized in that it includes a vibration sensor, and the vibration sensor includes a driver, a modulator, an optical coupler, a photoelectric converter and a data collector, The laser is connected to the vibration sensor, and the optical fiber detector is connected to the vibration sensor for emitting laser light to the optical coupler and receiving the optical signal returned by the optical coupler. The optical fiber detector includes an optical time domain reflectometer, an optical switch and a wavelength division multiplexing device; the positive progress effect of the present invention is: real-time reading of the attenuation coefficient of the optical cable along the way, timely discovery of optical cable damage and breakpoint position, highly accurate measurement of the attenuation and damage of the entire optical cable; the wavelength division multiplexer returns when the light source reflects Other wavelengths other than the operating wavelength of the optical time domain reflectometer are filtered out, and the lasers of different wavelengths in different parts do not interfere with each other, and the measurement accuracy is high.

Description

technical field [0001] The invention relates to a sensor system, in particular to a distributed optical fiber vibration sensor system with a real-time attenuation monitoring function. Background technique [0002] The detection distance of the positioning vibrating optical fiber system can reach more than 80 kilometers. The sensing optical cable often passes through roads, bridges, factories and other areas with dense population and frequent production activities. It is easy to be damaged by various illegal constructions during use. When the optical cable is damaged, the sensing optical cable at the rear end will lose its use efficiency. [0003] The traditional solution is that the operator observes the vibration waveform, and takes the position where the vibration waveform suddenly drops to close to the electrical noise value as the fiber damage or break point. However, the waveform of the vibrating optical fiber is the intensity distribution diagram after the interferenc...

AI Technical Summary

Problems solved by technology

However, the waveform of the vibrating optical fiber is the intensity distribution diagram after the interference of the returned optical signal, which contains a considerable degree of vibration signal, and cannot truly reflect the attenuation and damage along the optical fiber.

Therefore, the accuracy and precision of judging the location of the cable damage or break point are not satisfactory

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