Optical fiber temperature and strain sensing device and method based on high spectral resolution technology

Abstract

The invention discloses an optical fiber temperature and strain sensing device based on a high spectral resolution technology. The optical fiber temperature and strain sensing device comprises an optical transmitting system, an optical fiber sensing system, a high spectral resolution scanning system, an optical filtering system, a data acquisition system and a control system. The invention further discloses an optical fiber temperature and strain sensing method based on a high spectral resolution technology. According to the invention, temperature and strain carriers based on optical fiber brillouin scattering are used for the distributed sensing of temperature and strain; a narrowband reflective tunable Bragg grating is used for filtering out optical fiber brillouin back scattering, a cavity length-tunable Fabry-Perot interferometer is used for the full spectrum scanning of optical fiber brillouin scattering spectrum, a single photon technology is used for detecting a back brillouin scattering signal in the optical fiber; the invention has the advantages that the structure is simple, s the stability is high, compared with coherent detection, the signal detection and processing difficulty and complexity are reduced, and the detection distance resolution and accuracy are improved.

Description

technical field [0001] The invention belongs to the field of distributed optical fiber sensing, in particular to an optical fiber temperature and stress sensing device and method based on hyperspectral resolution technology. Background technique [0002] Optical fiber sensing technology based on Brillouin scattering has continuous distributed, long-distance and high-precision measurement characteristics, and is especially suitable for large-scale, long-distance and high-risk fields such as large-scale civil engineering, optical fiber communication, petrochemical industry, and power industry. structural health monitoring. [0003] There are three main categories of distributed optical fiber sensing technologies based on Brillouin scattering: optical time domain methods, optical frequency domain methods and optical coherent domain methods. The optical time domain method uses the product of the time difference between the emission and reception of a narrow pulse and the speed ...

AI Technical Summary

Problems solved by technology

This not only increases the difficulty and complexity of signal detection and processing, affects measurement accuracy, but also increases the cost of the entire system

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