A aplicação e o princípio da medição distribuída de temperatura por fibra óptica

Temperature measurement is an important parameter for detection and control, which has always been valued by people. In today’s rapidly developing technology, the measurement of temperature information has more profound significance. Distributed fiber optic temperature sensing technology has become a remarkable new technology in fiber optic sensing technology due to its continuous and real-time measurement of the temperature field distributed along the fiber optic. This technology has been widely applied in the fields of power industry, indústria petroquímica, aerospace industry, nuclear industry, etc.. The common fibra óptica distribuída temperature measurement method is to obtain the light intensity ratio of anti Stokes and Stokes, then attenuate and compensate for the ratio data, and finally obtain the temperature through demodulation formula. No entanto, em aplicações práticas, the signal received by the photoelectric detection module is not the intensity of the anti Stokes light and Stokes light at different positions in the fiber, but the intensity of the anti Stokes light and Stokes light after attenuation and loss through backward propagation in the fiber. Portanto, it is necessary to compensate for the attenuation of the signal received by the photoelectric detection module.

The distributed fiber optic temperature measurement method fits the intensity ratio signal of anti Stokes light and Stokes light in segments based on the attenuation point data of the fiber optic. Então, the actual obtained ratio line data is divided by the fitted baseline data, and the division result is calibrated to obtain the fiber optic temperature. A presente invenção amplia o escopo de uso de medição de temperatura de fibra óptica distribuída, permitindo a medição normal da temperatura mesmo em casos de baixa qualidade da fibra. Usando o método de segmentação para atenuar e compensar o sinal de relação de intensidade de luz de anti-Stokes e Stokes, a curva de temperatura demodulada pelo sistema é consistente com a situação real, melhorando assim a precisão da medição de temperatura e a confiabilidade do sistema de medição de temperatura.

Sensor de temperatura de fibra óptica, Sistema de monitoramento inteligente, Fabricante distribuído de fibra óptica na China