Chaotic Brillouin light time domain/coherence domain fusion analytical equipment and method

Abstract

The invention applies to a distributed fiber sensing monitoring system, and specifically relates to a chaotic Brillouin light time domain / coherence domain fusion analytical equipment and method; the equipment comprises a chaotic laser, a first optical isolator, a 1*2 fiber coupler, a first fiber polarization controller, a first high speed electric light modulator, a microwave signal source, a fiber grating, a first light circulator, a second fiber polarization controller, a second high speed electric light modulator, a pulse generator, a light scrambler, a light amplifier, a second optical isolator, a sensing fiber, a second light circulator, a tunable light filter, and an optical power detector; the equipment combines the advantages of an existing BOCDA system and a BOTDA system; the conventional BOTDA system spatial resolution is limited; the conventional BOCDA system uses continuous light as a detection signal, so the sensing distance has fuzzy distance problems, wherein the continuous light frequency is modulated by the sine or the continuous light phase is modulated by the pseudo random sequence; the long distance and high spatial resolution of the conventional distributed sensing system cannot be fully considered; the chaotic Brillouin light time domain / coherence domain fusion analytical equipment and method can solve said problems.

Description

technical field [0001] The invention is applied to a distributed optical fiber sensing monitoring system, and is specifically a chaotic Brillouin optical time domain / coherent domain fusion analysis device and method. Background technique [0002] Since the advent of low-loss optical fibers in the 1980s, optical fiber sensing technology has been at the forefront of sensor technology development, and has become two important fields of optical fiber technology together with optical fiber communication technology. Optical fiber sensors based on communication optical fiber as a carrier and relying on the characteristics of high transmission rate and high bandwidth of optical fiber have become one of the most important inventions in the field of sensing. Compared with traditional sensors, fiber optic sensors themselves are not charged, and have the advantages of anti-electromagnetic interference, electrical insulation, corrosion resistance, multi-parameter measurement, high sensit...

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Problems solved by technology

[0007] The present invention provides a chaotic sensor system for solving the technical problems that the spatial resolution of existing positioning in the distributed optical fiber sensing system based on chaotic laser detection is limited by the bandwidth of photoelectric detectors, data acquisition cards and other hardware and the high cost of system hardware. Brillouin optical time domain / coherent domain fusion analysis device and method

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