Single-ended chaotic Brillouin dynamic strain measuring device and method based on Rayleigh scattering

Abstract

The invention discloses a single-ended chaotic Brillouin dynamic strain measuring device and method based on Rayleigh scattering, aiming at meeting the current requirements of long-distance, high-resolution, large dynamic range and real-time and rapid application of distributed sensing and simultaneously solving the problem that a system cannot work when a breakpoint occurs because a pump light and a detection light need double-end incidence in a Brillouin optical coherence domain analysis system. A continuous light output by a light source is divided into two paths through a coupler, one pathis used as the pump light, the other path is subjected to double-sideband modulation through a high-speed electro-optic modulator, a backward Rayleigh scattering light is used as the detection lightand generates stimulated Brillouin scattering with the pump light, and a corresponding dynamic strain value is demodulated through a corresponding relation between intensity information acquired by ahigh-speed data acquisition system and strain. The single-ended chaotic Brillouin dynamic strain measuring device is simple in structure and low in cost, can effectively reduce signal power fluctuation, and realizes dynamic strain measurement with single end, high spatial resolution, long distance and good stability.

Description

technical field [0001] The invention relates to the field of distributed optical fiber sensing, in particular to a single-end chaotic Brillouin dynamic strain measuring device and method based on Rayleigh scattering. Background technique [0002] Structural health monitoring of important infrastructure in various fields such as military defense, large-scale industrial and mining, and civil security is an essential link to avoid major economic losses and maintain social stability and development. In today's society, the "smart city" with artificial intelligence monitoring network as the core has become the trend of the times. In order to meet the needs of modern monitoring networks for real-time monitoring of dynamic parameters, research on the real-time performance of strain monitoring in the field of distributed optical fiber sensing has been become hot. [0003] As the signal with the strongest scattering intensity in optical fiber, Rayleigh scattering was first applied i...

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Problems solved by technology

[0006] The present invention aims to solve the problem that the existing dynamic strain measurement technology cannot take into account single-ended structure, long distance and high spatial resolution at the same time, and provides a single-ended chaotic Brillouin dynamic strain measurement device and method based on Rayleigh scattering, aiming at To meet the current application requirements for distributed sensing with long distance, high resolution, large dynamic range, and real-time speed, and at the same time solve the problem that the pump light and probe light need to be incident at both ends in the Brillouin optical coherence domain analysis system, which causes the system to appear Problem with breakpoints not working

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