Brillouin optical correlation-domain analyzer device and method based on supercontinuum

Abstract

The invention relates to a distributed optical fiber sensing system, in particular to a Brillouin optical correlation-domain analyzer device and method based on a supercontinuum. The device comprises a quasi-continuous wave Raman fiber laser, a first optical isolator, a real wave fiber, a first tunable optical filter, a second optical isolator, a 1*2 fiber coupler, a first polarization controller, a high-speed electro-optical modulator, a microwave signal source, a variable optical delay line, a first optical amplifier, an optical scrambler, a third optical isolator, a sensing fiber, a second polarization controller, a second optical amplifier, an optical circulator, a second tunable optical filter and an optical power detector. Compared with a BOCDA (Brillouin Optical Correlation-Domain Analysis) system, the Brillouin optical correlation-domain analyzer device and method based on a supercontinuum have the higher spatial resolution and a longer distributed sensing distance; it is worth stating that the supercontinuum has a wider spectrum, meaning that the spatial resolution can reach sub-millimeter level, and the output power of the quasi-continuous Raman fiber laser is high so as to provide enough energy for long-distance sensing.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a supercontinuum-based Brillouin optical correlation domain analyzer device and method. Background technique [0002] At present, distributed optical fiber sensing technology has been widely used in security monitoring fields such as underground tunnels, aerospace, petrochemical, electric power industry, nuclear industry, civil engineering and military. Since distributed optical fiber sensing technology uses optical fiber as the sensing element and transmission element, temperature and strain measurements at different locations along the entire length of the optical fiber can be realized. Compared with other sensing technologies, the fractional optical fiber based on Brillouin scattering has the advantages of high spatial resolution, long sensing distance, anti-electromagnetic interference, and small error, and is favored by people. [0003] At present, the research ...

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Problems solved by technology

[0007] The invention adopts the supercontinuum signal as the detection signal, proposes a brand-new Brillouin optical correlation domain analyzer, and solves the problem of limited sensing distance and insufficient spatial resolution in the existing distributed sensing technology based on BOCDA. advanced questions

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