Sensing signal detecting device and method based on fiber Brillouin ring laser

Abstract

The invention discloses a sensing signal detecting device and a sensing signal detecting method based on a fiber Brillouin ring laser. The device comprises a narrow linewidth DFB (distributed feedback) laser, three optical fiber couplers, a pulse modulator, two erbium-doped fiber amplifiers, two optical fiber circulators, two single-mode fibers, an optical isolator, a polarization controller and a photoelectric detector, wherein the fiber Brillouin ring laser is composed of the second optical fiber circulator, the second single mode fiber, the optical isolator, the second optical fiber coupler and the polarization controller. Light emitted from the laser is divided into two beams of light via the optical fiber couplers, wherein the probe light is modulated into pulsed light which enters into sensing optical fiber after passing through the erbium-doped fiber amplifiers to ensure that back spontaneous Brillouin scattered signals are generated; the reference light passes through the center frequency of the fiber Brillouin ring laser to ensure that a Brillouin frequency shift is generated; and the coherent detection is carried out on the two Brillouin scattered signals which are scattered back to ensure that the advantages of rapid high-accuracy detection and simple structure are realized by utilizing low-cost devices.

Description

technical field [0001] The invention belongs to the technical field of test and measurement, in particular to a Brillouin sensing signal detection device and method based on an optical fiber Brillouin ring laser. Background technique [0002] Distributed optical fiber sensing technology occupies an important position in today's sensing field. Its biggest advantage is that it can realize distributed measurement, coupled with the unique characteristics of optical fiber, such as light weight and softness, anti-electromagnetic interference, and the ability to integrate transmission sensing In Yishen et al., distributed optical fiber sensing technology has become the focus of people's research. Brillouin optical time domain reflectometer (BOTDR) can realize distributed measurement, and can measure two parameters of temperature and strain at the same time. Has a wide range of applications. [0003] Self-Brillouin scattering is extremely weak, which is about 2 to 3 orders of magn...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the prior art that the frequency of the coherent optical signal is too high, the detection technology is complicated, the stability is poor, and the cost is high

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