Ultra-remote distributed fiber raman and brillouin photons sensor

A distributed optical fiber and photon sensor technology, applied in the field of optical fiber sensors, can solve the problems of narrow bandwidth and low precision of optical fiber Brillouin scattering spectrum, and achieve the effects of overcoming optical fiber loss, improving measurement accuracy, and increasing transmission distance

Inactive Publication Date: 2009-05-27
WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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Problems solved by technology

Although distributed optical fiber Brillouin photonic sensors have a broad application market, due to the narrow spectral bandwidth of optical fiber Brillouin scattering, the accuracy of measuring strain and temperature using the intensity ratio of optical fiber Brillouin scattering light is very low

Method used

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  • Ultra-remote distributed fiber raman and brillouin photons sensor

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Embodiment Construction

[0019] refer to figure 1, invented ultra-long-range distributed optical fiber Raman and Brillouin photonic sensors, including distributed optical fiber Raman photonic temperature sensor, distributed optical fiber Brillouin photonic strain sensor, distributed optical fiber Raman amplifier and 100km single-mode optical fiber19, The distributed fiber Raman photonic temperature sensor consists of a semiconductor pulse laser 11, a wave combiner 14, a unidirectional device 15, a 1 x 2 fiber bidirectional coupler 18, a fiber grating narrow-band reflection filter 20, a wavelength division multiplexer 21, an inverse The Stokes scattering light filter 22, the Stokes Raman scattering light filter 23 and the photoelectric direct detection system 24 are composed. The distributed fiber Brillouin photonic strain sensor is composed of an external cavity semiconductor narrowband pulse fiber laser 12, a demultiplexer 13. The first narrowband fiber grating filter 25, the second narrowband fiber ...

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Abstract

The invention discloses super-far distributed fiber Raman and Brillouin photon sensors; by using the stimulated Raman scattering effect of fiber, the self Raman scattering effect of fiber, the Brillouin scattering effect of fiber and the light time-field reflection principle, distributed fiber Raman photon temperature sensors, distributed fiber Brillouin photon strain sensors and distributed fiber Raman amplifier are integrated together. Fiber consumption is overcome by using the gain of amplifier, and strengths of self Raman scattering light and Brillouin scattering light in fiber is enhanced, the signal to noise ratio of the system of distributed fiber Raman photon sensor and distributed fiber Brillouin photon strain sensor is enhanced, meanwhile, the transmission distances of distributed fiber Raman photon sensor and distributed fiber Brillouin photon strain sensor are increased, finally, the temperature and stress measuring accuracy is enhanced.

Description

technical field [0001] The invention relates to an ultra-long-range distributed optical fiber Raman and Brillouin photonic sensor, and belongs to the technical field of optical fiber sensors. Background technique [0002] In the field of distributed optical fiber sensors, there are distributed optical fiber Raman photonic temperature sensors using the spontaneous Raman scattering temperature effect of optical fibers at home and abroad; there are distributed optical fiber strain and temperature sensors using the Brillouin scattering effect abroad (Bao Xiaoyi, University of Ottawa, Canada) Bao, Newson, University of Southampton, UK), and distributed fiber-optic Brillouin strain and temperature sensors with integrated fiber-optic Raman amplifiers (Newson, University of Southampton, UK). Although distributed fiber Brillouin photonic sensors have a broad application market, due to the narrow spectral bandwidth of fiber Brillouin scattering, the accuracy of measuring strain and te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01K11/32G01B11/16H01S5/00H01S3/067G02F1/35G02B6/28G02B6/34G01K11/322G01K11/324
Inventor 张在宣龚华平
Owner WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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