Phase modulation type sensing device based on Brillouin phase shift
A technology of phase modulation and sensing devices, which is applied in the direction of using optical devices to transmit sensing components, etc., can solve the problems of low stability, distributed optical fiber complexity and high cost, to avoid pre-frequency shift, overcome non-local effects, The effect of reducing complexity
Inactive Publication Date: 2015-12-09
CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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[0003] The purpose of the present invention is to solve the problem of high complexity, high cost and low stability of the distributed optical fiber sensing method in the prior art, and proposes a phase modulation type sensing device based on Brillouin phase shift
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[0017] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0018] The invention provides a phase modulation sensing device based on Brillouin phase shift, such as figure 1 As shown, it includes a laser 1, an optical coupler 2, a polarization controller 3, an electro-optical phase modulator 4, a microwave signal generator 5, a polarization scrambler 6, a first erbium-doped fiber amplifier 7, an optical isolator 8, and a test fiber 9 , acousto-optic modulator 10, pulse signal generator 11, second erbium-doped fiber amplifier 12, circulator 13, Bragg grating 14, photodetector 15, electric bandpass filter 16, quadrature demodulator 17 and oscilloscope 18 .
[0019] The center frequency of the optical carrier output by laser 1 is f L , the optical carrier is divided into two parts by the 50:50 coupler 2, that is, the first optical carrier and the second optical carrier.
[0020] The microwave signal generated by t...
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The invention discloses a phase modulation type sensing device based on Brillouin phase shift, and the device enables a light carrier generated by a light source to be divided into two parts, wherein one part is externally modulated by an electric pulse to generate pulse pump light, and the other part is externally modulated by an electric light phase modulator to generate detection light and local light through a 10-12GHz microwave signal. The detection light and the pulse pump light interact with each other in a testing optical fiber, and then generate a 10-12GHz high-frequency signal with the local light through beat frequency, wherein the phase is directly demodulated by a 9-12GHz broadband quadrature demodulator, thereby avoiding advanced frequency shift, reducing the complexity and cost of the device, and improving the stability of the device.
Description
technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing, and in particular relates to the design of a phase modulation sensing device based on Brillouin phase shift. Background technique [0002] The distributed optical fiber sensing technology based on the Brillouin effect has been extensively studied for many years. The key to this technology is that the Brillouin frequency shift in the optical fiber is linearly related to the temperature and stress applied to the optical fiber. Usually, a beam of pulsed pump light is input from one end of the fiber to cause Brillouin gain, and another beam of continuous probe light with adjustable frequency is input from the other end of the fiber and scans the Brillouin gain interval to reconstruct the Brillouin gain spectrum. Before 2012, probing light was often based on direct modulation, and sensing was also based on the measurement of the Brillouin gain spectrum. The device was simple...
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IPC IPC(8): G01D5/353
Inventor 彭玉兰
Owner CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD