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Ultra-remote distributed fiber raman and brillouin photons sensor

A distributed optical fiber and photonic sensor technology, applied in the field of optical fiber sensors, can solve the problems of narrow spectral bandwidth and low precision, and achieve the effect of overcoming optical fiber loss, improving measurement accuracy, and improving signal-to-noise ratio.

Inactive Publication Date: 2008-04-16
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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Embodiment Construction

[0019] Referring to Figure 1, the invented ultra-long-distance distributed optical fiber Raman and Brillouin photon sensor includes distributed optical fiber Raman photon temperature sensor, distributed optical fiber Brillouin photon strain sensor, distributed optical fiber Raman amplifier and 100km single-mode Optical fiber 19, distributed optical fiber Raman photon temperature sensor consists of semiconductor pulse laser 11, multiplexer 14, one-way device 15, 1 × 2 fiber bidirectional coupler 18, fiber grating narrow-band reflection filter 20, wavelength division multiplexer 21 , an anti-Stokes scattered light filter 22, a Stokes Raman scattered light filter 23 and a photoelectric direct detection system 24, the distributed optical fiber Brillouin photonic strain sensor consists of an external cavity semiconductor narrowband pulsed fiber laser 12, The wave splitter 13, the first narrowband fiber grating filter 25, the second narrowband fiber grating filter 26, the circulator ...

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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-distance distributed optical fiber Raman and Brillouin photon sensor, belonging 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 photon temperature sensors using the temperature effect of spontaneous Raman scattering of optical fibers at home and abroad; there are distributed optical fiber strain and temperature sensors using the Brillouin scattering effect abroad (Xiaoyi Bao, University of Ottawa, Canada Bao, Newson, University of Southampton, UK), and distributed optical fiber Brillouin strain and temperature sensors with integrated fiber Raman amplifiers (Newson, University of Southampton, UK). 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 st...

Claims

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Application Information

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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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