A polarization orthogonal double-pump pulse botda sensing device and method
A polarization orthogonal, sensing device technology, applied in the direction of measuring devices, converting sensor output, using optical devices to transfer sensing components, etc., can solve the problems of inability to achieve high signal-to-noise ratio long-distance sensing, and avoid polarization correlation damage, improve sensing efficiency, and improve the effect of Brillouin spectrum signal-to-noise ratio
Active Publication Date: 2021-10-08
TAIYUAN UNIV OF TECH
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[0005] In order to solve the problem that the existing BOTDA system based on stimulated Brillouin scattering cannot achieve long-distance sensing with high signal-to-noise ratio due to the limitation of injected light power, this invention proposes a polarization orthogonal dual-pump pulsed light BOTDA Sensing device and method
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than All the embodiments; based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention.
[0032] like figure 1 As shown, the embodiment of the present invention provides a polarization orthogonal double-pumped pulsed light BOTDA sensing device, including a laser 1, a beam splitter 2, a first polarization controller 3, a first microwave signal source 4, a first Electro-optic modulator 5, semiconductor optical amplifier 6, arbitrary waveform generator 7, function generator 8, polarization switch...
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The invention belongs to the technical field of distributed optical fiber sensing. In order to solve the problem that the existing BOTDA sensing system cannot realize long-distance sensing with high signal-to-noise ratio due to the limitation of pump light and detection light injection power, it provides a Polarization orthogonal double-pump pulse BOTDA sensing device, including a laser, the laser signal output by the laser is divided into two beams after passing through the beam splitter, one beam is used as the detection light, and is sequentially passed through the second polarization controller and the second electro-optical modulation The sensor and the fiber Bragg grating are incident on one end of the sensing fiber, and the other end of the sensing fiber is provided with a photodetector; the other beam is used as pump light, which passes through the first polarization controller, the first electro-optic modulator, and the semiconductor light in sequence. After the amplifier and polarization switch, it is incident from the other end of the sensing fiber; the photodetector is used to detect the probe light after stimulated Brillouin amplification or attenuation in the sensing fiber, and convert it into an electrical signal and send it to the data acquisition and analysis system. The invention is applicable to the field of distributed optical fiber sensing.
Description
technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a polarization orthogonal dual-pump pulse BOTDA sensing device and method. Background technique [0002] In recent years, the BOTDA technology based on stimulated Brillouin scattering has become the focus of researchers because of its advantages of long sensing distance and high measurement accuracy. Since its performance, such as sensing distance, spatial resolution, and measurement accuracy, is affected by the system signal-to-noise ratio, the improvement of the signal-to-noise ratio becomes a decisive factor for sensor performance optimization. However, improving the system signal-to-noise ratio requires a higher detection Light and pump light injection power, but high injection power will cause nonlinear effects, such as pump light attenuation and probe light modulation instability, etc., which limits its sensing performance. In order to overcome this contradicti...
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IPC IPC(8): G01D5/353
CPCG01D5/35316G01D5/35364
Inventor 张明江张倩王涛张建忠乔丽君高少华赵婕茹刘靖阳李健
Owner TAIYUAN UNIV OF TECH