Ultra-long distance distributed optical sensing device and method based on two-way optical amplification

Abstract

The invention provides an ultra-long distance distributed optical sensing device based on two-way optical amplification. The device comprises a controlling and processing device, a broadband laser device (1) and a first optical fiber coupler (2), parallel first optical fiber arm (3) and second optical fiber arm (4), a second optical fiber coupler (6), a sensing link (7) and a faraday rotation mirror (8), all of which are orderly connected together; a photoelectric detector (20) is further connected between the controlling and processing device and the first optical fiber coupler (2). The ultra-long distance distributed optical sensing device is long in sensing distance, relatively high in accuracy and good in positioning effect.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to an online real-time monitoring and positioning method and a monitoring device for regional perimeter vibration signals. It is an ultra-long-distance distributed optical sensing method and device based on bidirectional optical amplification. Background technique [0002] Fully distributed optical fiber vibration sensing is a functional optical fiber sensor, which uses the sensing and conduction characteristics of optical fibers to perform real-time continuous vibration monitoring along the laid optical fiber link. It has ultra-long distance, high sensitivity, no blind area, anti-interference, and corrosion resistance. And other advantages, especially suitable for perimeter security, pipeline leakage monitoring and other occasions. [0003] Among the existing long-distance distributed optical fiber vibration sensors, the more mature ones include distributed vibration sensors ba...

AI Technical Summary

Problems solved by technology

However, the sensing principle based on backscattering still limits the intensity of signal light in principle. At the same time, the effect of unidirectional light amplification on backscattered light is not as obvious as that of forward light. It is difficult to greatly improve the signal-to-noise ratio and is vulnerable to Due to external interference, the sensing accuracy decreases or even the positioning fails. Repeated detection and data processing are required to obtain accurate information, and the real-time performance is poor.

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