Chaotic laser relevant full-distribution fiber Raman and Rayleigh photon sensor

Abstract

The invention discloses a chaotic laser relevant full-distribution fiber Raman and Rayleigh photon sensor which is manufactured by positioning measurement points according to the chaotic laser relevant principle, the fiber Raman and Rayleigh fusion scattering sensing principle and the optical time domain reflection principle. The sensor adopts a chaotic laser, an optical pulse sequence which is randomly fluctuant on a time domain is subjected to relevant processing by the reverse detection light of a sensing fiber and local reference light to improve the spatial resolution of a sensor system.The photon number of an incident fiber is effectively increased, the signal to noise ratio of the sensor system is improved, the measurement length and measurement precision of the sensor are improved, and the on-site deformation and fissure can be measured while on-site temperature is measured without intersecting with measurement temperature. The chaotic laser relevant full-distribution fiber Raman and Rayleigh photon sensor has the characteristics of low cost, long service life, simple structure, high spatial resolution, good signal to noise ratio and the like and is suitable for monitoring 15cm petrochemical pipelines with high spatial resolution within the range of 30 kilometers as well as the large civil engineering and monitoring hazard forecast.

Description

technical field [0001] The invention relates to the field of optical fiber sensors, in particular to a chaotic laser-related high spatial resolution fully distributed optical fiber Rayleigh and Raman scattering strain and temperature sensor. Background technique [0002] The optical fiber sensor network developed in recent years can realize the safety and health monitoring and disaster forecasting and monitoring of large-scale civil engineering, electric power engineering, petrochemical industry, traffic bridges, tunnels, subway stations, dams, embankments and mining projects. There are two types of optical fiber sensors: one is a quasi-distributed optical fiber sensor network composed of point sensors such as fiber grating (FBG) and fiber optic method white (F-P) "hanging" (laying) on ​​the optical fiber and using optical time domain technology , the main problem of the quasi-distributed optical fiber sensor network is that the optical fiber between point sensors is only th...

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Problems solved by technology

However, it is difficult to improve the spatial resolution of the sensing system. The research team of Professor Wang Yuncai proposed to use the chaotic laser correlation method for OTDR, and the spatial resolution reached 6cm (Wang Anbang, Wang Yuncai, optical time domain reflectometry technology of chaotic laser correlation method, Chinese Science, Information Science, 2010, Vol. 40, No. 3, pp. 1-7) but cannot measure the temperature of each point on the sensing fiber

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