Long-distance distributed optical fiber vibration monitoring device and realization method thereof

Abstract

The invention relates to the field of pipeline safety monitoring, and specifically relates to a long-distance distributed optical fiber vibration monitoring device employing optical fibers as sensors and a realization method thereof. The device is characterized in that the device comprises a pulse source, an optical fiber amplifier, a circulator, detection optical fibers, a relay amplification module, a backward amplification module, a narrowband filter, a signal detection module, an acquisition module, a synchronous control module, a host computer, a coupler, two wavelength division multiplexers, two amplification laser sources, two feedback detection modules, and power supply control modules. Compared with the prior art, according to the device, the monitoring distance of the system can be further extended, the application cost is obviously reduced, the economic benefit is substantially increased, the system design employs the optical time domain reflection positioning technology, the phase sensitive recognition technology, the distributed amplification technology, the remote signal control technology and the signal multi-resolution extraction technology, and the optical signal transmission distance and the signal analysis recognition capability are effectively increased.

Description

technical field [0001] The invention relates to the field of pipeline safety monitoring, in particular to a long-distance distributed optical fiber vibration monitoring device using optical fiber as a sensor and a realization method thereof. [0002] technical background [0003] With the development of optical fiber communication technology, optical fiber sensing technology is gradually emerging. The detection objects of optical fiber sensing are very wide, including temperature, humidity, strain, acceleration, vibration, voltage, current and other parameters. At the same time, it has the advantages of high sensitivity, good electrical insulation, anti-electromagnetic interference, and high measurement accuracy. application market. Distributed optical fiber sensing technology uses optical fiber not only as the sensing unit but also as the medium of signal transmission to realize the monitoring of all objects in the spatially distributed area of ​​optical fiber. In addition ...

AI Technical Summary

Problems solved by technology

Mach-Zehnder interferometer technology has a simple design structure, but it will be affected by polarization attenuation for long distances, resulting in extremely poor positioning accuracy and poor application effect; white light interferometry technology has low hardware cost, but the zero point positioning algorithm is difficult. At the same time, the problem of poor positioning accuracy will also exist due to the interference of the surrounding environment, which cannot meet the application; the phase-sensitive OTDR technology can accurately locate through the time domain, and there is no problem of positioning deviation. It has been successfully applied in pipeline safety monitoring.

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