Ultra-remote distributed fiber raman photons temperature sensor integrated with raman amplifier

Abstract

The present invention discloses an ultra-long-range distributed fiber Raman photon temperature sensor of an integrated Raman amplifier, and comprises a distributed fiber Raman photon temperature sensor, a distributed fiber Raman amplifier and a fiber grating narrowband reflecting filter. The distributed fiber Raman amplifier is adopted to be embedded into the distributed fiber Raman photon temperature sensor; the gain of the amplifier is used to overcome fiber loss, strengthen the intensity of spontaneous Raman scattering light in the fiber, improve signal-to-noise ratio of the distributed fiber Raman photon temperature sensor system, augment the transmission distance of the distributed fiber Raman photon temperature sensor and improve temperature-measuring precision. With the fiber stimulated Raman scattering effect, the fiber spontaneous Raman scattering effect and the optical time domain reflection principle, the invention skillfully merges the technologies of the distributed fiber Raman amplifier and the distributed fiber Raman photon temperature sensor and achieves the ultra-long-range distributed fiber Raman temperature sensor.

Description

technical field [0001] The invention relates to an ultra-long-distance distributed optical fiber Raman photon temperature sensor integrated with a Raman amplifier, belonging to the technical field of optical fiber sensors. Background technique [0002] In the distributed optical fiber sensor, the distributed optical fiber Raman photon temperature sensor composed of the principle that the intensity of the spontaneous Raman scattered light of the optical fiber is modulated by temperature and the principle of optical time domain reflection has a broad application market. The existing distributed optical fiber Raman photonic temperature sensors at home and abroad are limited by the signal-to-noise ratio of the system, and the maximum measurement distance is 30km. The present inventor has used the principle of optical fiber spontaneous Raman scattering amplification to improve the signal-to-noise ratio of the system (Zhang Zaixuan, Wang Jianfeng, Liu Honglin, Yu Xiangdong, etc., ...

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Problems solved by technology

The existing distributed optical fiber Raman photonic temperature sensors at home and abroad are limited by the signal-to-noise ratio of the system, and the maximum measurement distance is 30km

The present inventor has used the principle of optical fiber spontaneous Raman scattering amplification to improve the signal-to-noise ratio of the system (Zhang Zaixuan, Wang Jianfeng, Liu Honglin, Yu Xiangdong, etc., Insoo S.KIM, Experimental research on 30km long-distance distributed optical fiber Raman temperature sensor system, China Laser , 2004, 31(5): 613-616.EI(433813429)), the maximum measurement distance is 31km, which has improved, but has not broken through the range of >30km

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