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Distributed optical fiber temperature measurement solution
Editor:admin  Clicks:  Update time:2017-04-13 14:17
Working principle
Distributed optical fiber temperature sensor is a scattering type optical fiber sensor, optical pulse by the backscattered light including Rayleigh scattering, Raman scattering and Brillouin scattering, so fiber optic sensor including the use of Rayleigh scattering OTDR using Brillouin scattering B-OTDR, B-OTDA (Brillouin Optical Time-Domain Analysis, B-OTDA) and Raman scattering R-OTDR.
Usually the DTS temperature measurement principle and positioning principle is R-OTDR, is the use of Raman scattering, the working principle of optical pulse in optical fiber Raman scattering will occur, the backward scattered light to spread to the starting end of each fiber, back propagation light scattering corresponds to a scattering point of the optical fiber. Collect and analyze the information back to the time and intensity of scattering light can get the corresponding position and temperature information.
Distributed optical fiber temperature measurement system is mainly composed of three parts: temperature measuring machine, temperature sensing fiber and temperature demodulation software. The temperature measuring machine mainly comprises a laser, a 1*3 wavelength division multiplexer, an avalanche photodiode module, an amplifying module, a data acquisition module and a thermostatic device. The working principle of a laser pulse pulse semiconductor laser, occurs in optical fiber Raman backscattering, Stocks and Anti-Stocks respectively by Raman scattering light, avalanche photodiode is converted to a voltage signal amplified by high speed AD converter sampling intensity information by temperature demodulation software demodulation of the optical fiber temperature information integration.

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