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

A photon sensor, fully distributed technology, used in instruments, scientific instruments, and optical devices, etc., can solve the problems of difficulty in improving the spatial resolution of the sensing system and the inability to measure the temperature of the sensing fiber, and achieve improved spatial resolution, The effect of increasing the number of pump photons and increasing the measurement length

Inactive Publication Date: 2012-01-18
CHINA JILIANG UNIV
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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 Anba

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

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Embodiment Construction

[0036] Reference figure 1 , Chaotic laser related fully distributed fiber Raman and Rayleigh photon sensor, including semiconductor LD laser 10, first polarization controller 11, fiber circulator 12, first fiber splitter 13, adjustable optical attenuator 14, first Two-polarization controller 15, unidirectional device 16, erb-doped fiber amplifier EDFA 17, second fiber splitter 18, fiber wavelength division multiplexer 19, sensing fiber 20, fiber delay line 21, first photoelectric receiving module 22, The second photoelectric receiving module 23, the digital signal processor 24 and the computer 25. The semiconductor LD laser 10 is connected to an input port of the optical fiber circulator 12 via the first polarization controller 11, and the output end of the optical fiber circulator 12 is connected to the input end of the first optical fiber splitter 13, and the first optical fiber splitter 13 One output end of the tunable optical attenuator 14 is connected to the input end of ...

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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, power engineering, petrochemical industry, traffic bridges, tunnels, subway stations, dams, levees and mining projects. There are two major types of optical fiber sensors: one type is a quasi-distributed optical fiber sensor network composed of point sensors such as fiber grating (FBG) and fiber white (FP) on the optical fiber, using optical time domain technology. The main problem of the quasi-distributed optical fiber sensor network is that the optical fiber between the point sensors is only the transmission medium, so there is a detect...

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Application Information

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IPC IPC(8): G01B11/16G01K11/32G01K11/3206G01K11/322G01K11/324
Inventor 张在宣王剑锋余向东
Owner CHINA JILIANG UNIV
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