Distributed optical fiber sensing device and distributed optical fiber sensing method with multi-spatial resolution performance

Abstract

The invention discloses a distributed optical fiber sensing device and a distributed optical fiber sensing method with multi-spatial resolution performance. The device comprises a laser, a first coupler, a first acousto-optic modulator, a second acousto-optic modulator, a third acousto-optic modulator, a second coupler, an erbium-doped optical fiber amplifier, an optical filter, a fiber optic circulator, an avalanche photodiode, a signal acquisition card, a pulse generator, and a sensing fiber. At the same time, a method based on the distributed optical fiber sensing device with multi-spatialresolution performance is also disclosed. The distributed optical fiber sensing device and a distributed optical fiber sensing method with multi-spatial resolution performance can achieve the matchingof a spatial resolution and a vibration action range without reducing the frequency response range of the system, thereby achieving the optimization of the system performance.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a distributed optical fiber sensing device and method with multi-spatial resolution performance. Background technique [0002] With the rapid development of my country's economy, many large infrastructures have entered the stage of large-scale construction. Coupled with the already built infrastructure, there is an urgent need for reliable monitoring of the structural health of these long-distance, large-scale infrastructures. Finding an effective monitoring system has become a research hotspot. Due to the advantages of high measurement accuracy, anti-electromagnetic interference, corrosion resistance, long-distance distributed sensing, small size, and easy installation and embedding, the distributed optical fiber sensing system has been applied to many structural health detection fields. [0003] For applications that need to detect vibrations, such as structural...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a distributed optical fiber with multi-spatial resolution performance in view of the problem in the prior art that it is difficult to simultaneously achieve high signal-to-noise ratio in the measurement of vibration regions of different lengths in the same sensing system. The sensing device can realize the measurement of high signal-to-noise ratio for vibration regions of different lengths at the same time, and can also match a relatively good signal-to-noise ratio for vibrations of a single unknown length, and the measurement results are more reliable

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