Combined Raman and Brillouin scattering distribution type fiber sensing device with double end detection
A technology of Brillouin scattering and distributed optical fiber, which is applied in the direction of measuring devices, using optical devices, and using optical devices to transmit sensing components, etc., can solve the problem of limiting the application range of long-distance detection, limiting the accuracy of simultaneous demodulation of temperature and strain, Low optical power sensitivity coefficient and other problems, to improve system measurement accuracy and system reliability, reduce measurement impact, improve system measurement accuracy and response speed
Pending Publication Date: 2018-02-23
MINNAN NORMAL UNIV
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Problems solved by technology
Due to the low sensitivity coefficient of optical power to strain in this method, the detected optical power error limits the accuracy of simultaneous demodulation of temperature and strain.
[0007]
2. Simultaneous demodulation of temperature and strain by combining Brillouin scattering spectrum frequency shift and Brillouin dynamic grating reflection spectrum frequency shift. This scheme can obtain good measurement accuracy, but polarization maintaining fiber must be used, and the sensing fiber distance Generally less than 1km, which limits its application range in long-distance detection
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[0028] Please check figure 1 , a distributed optical fiber sensing device combining Raman and Brillouin scattering for double-ended detection, which includes a microwave signal source 1, a DFB laser 2, a first fiber coupler 3, a second fiber coupler 11, and a first electro-optic modulator 4. The second electro-optic modulator 9, the grating filter 5, the first erbium-doped fiber amplifier 6, the second erbium-doped fiber amplifier 10, the third erbium-doped fiber amplifier 12, the first optical switch 8, the second optical switch 14, A third optical switch 15, a polarization scrambler 7, a pulse generator 22, a wavelength division multiplexer 13, a sensing fiber 16, a first photodetector 17, a second photodetector 19, an optical fiber circulator 18, and a data collector 20 and smart device 21;
[0029] The output end of the DFB laser 2 is connected with the input end of the first fiber coupler 3, an output end of the first fiber coupler 3 is connected with an optical input en...
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The invention discloses a combined Raman and Brillouin scattering distribution type fiber sensing device with double end detection, which is characterized in that the fiber sensing device comprises amicrowave signal source, a DFB laser means, a first fiber coupler, a second fiber coupler, a first electric light modulator, a second electric light modulator, a raster filter, a first erbium-doped fiber amplifier, a second erbium-doped fiber amplifier, a third erbium-doped fiber amplifier, a first optical switch, a second optical switch, a third optical switch, a scrambler, a pulse generator, a wavelength division multiplexing means, a sensing fiber, a first photoelectric detector, a second photoelectric detector, a fiber circulator, a data collector, and an intelligent means. The sensing device can measure temperature and strain simultaneously, can reduce the measurement influence brought by environmental change, can increase system measurement precision, system reliability and responsespeed.
Description
technical field [0001] The invention relates to a distributed optical fiber sensing device combining Raman and Brillouin scattering for double-end detection. Background technique [0002] Distributed Raman fiber optic sensors have many advantages such as long-distance distributed measurement, anti-electromagnetic interference, small size and light weight, etc., in urban gas pipelines, power transmission / communication cables, reservoir dams, bridges, tunnels, highways, etc., which require real-time temperature It has a wide range of applications in the field of monitoring. [0003] At present, there are mainly distributed Raman fiber optic temperature sensors and distributed Brillouin fiber optic temperature / strain sensors that are widely used. Among them, the Raman fiber sensor only measures temperature, and the Brillouin fiber sensor can be used for dual-parameter measurement of temperature and strain, but due to the cross-sensitivity of Brillouin scattering to temperature...
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Login to View More IPC IPC(8): G01D5/353G01B11/16G01K11/32G01K11/322G01K11/324
CPCG01B11/16G01D5/353G01K11/32G01K11/322G01K11/324
Inventor 陈福昌余超群张华林周锦荣何志民黄成
Owner MINNAN NORMAL UNIV