Multi-point parallel high-speed chaotic Brillouin dynamic strain monitoring device and method

Abstract

The invention relates to the field of distributed optical fiber sensing, and discloses a multi-point parallel high-speed chaotic Brillouin dynamic strain monitoring device and method. The device includes a broadband chaotic laser source, and the broadband chaotic laser source is used to output a strong periodic broadband chaotic laser. The broadband chaotic laser is divided into two beams by the beam splitter. One beam is used as the probe light and then enters one end of the sensing fiber after passing through the single-sideband modulator, the erbium-doped fiber amplifier, and the programmable optical delay generator; the other beam is used as the pump. The pump light is incident on the other end of the sensing fiber after passing through the semiconductor optical amplifier and the pulse optical amplifier in turn; the optical signal output from the other end of the sensing fiber is filtered by the tunable optical filter and then detected by the photodetector. Detection, the detection signal is collected by the data acquisition unit, and then sent to the computer for data processing. The invention can realize multi-point parallel monitoring, and can realize long-distance and high-resolution real-time monitoring of large-scale dynamic strain.

Description

technical field [0001] The invention relates to the field of distributed optical fiber sensing, in particular to a multi-point parallel high-speed Brillouin chaotic dynamic strain monitoring device and method. Background technique [0002] The rapid construction of large-scale civil infrastructure such as tunnels, bridges, oil and gas pipelines, and the wide coverage of power grids and optical networks provide favorable conditions for the construction of smart cities, but also put forward higher requirements for sensor monitoring technology. Distributed optical fiber sensing has stood out from many sensing and monitoring technologies due to its advantages such as small size, light weight, high temperature and high pressure resistance, and electromagnetic interference resistance. In order to further promote the sustainable development of society, avoid huge economic losses, and protect the safety of people's lives and property, the demand for dynamic monitoring technology of ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing dynamic strain measurement technology cannot achieve both multi-point real-time monitoring and high spatial resolution, the present invention provides a multi-point parallel high-speed chaotic Brillouin dynamic strain monitoring device and method, aiming to solve the problem of distributed The Liyuan optical coherent domain analysis system can only measure a single point, resulting in slow scanning and long time consumption, which meets the current application requirements for distributed sensing with high resolution, long distance, large dynamic range, and real-time speed

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