Cavity length demodulation system and demodulation method of a fiber-optic F-P sensor
A technology of F-P sensor and demodulation system, which is applied in the field of fiber-optic F-P sensor cavity length demodulation system, which can solve the problems of large overall size, small demodulation range of the demodulation system, and insufficient demodulation accuracy, so as to reduce noise Interference, improve demodulation accuracy and demodulation range, improve the effect of signal quality
Active Publication Date: 2021-04-06
西安光微科技有限公司
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[0005] The present invention provides a demodulation system and demodulation method for the cavity length of an optical fiber F-P sensor, so as to overcome the problems in the prior art that the demodulation range of the demodulation system is small, the demodulation accuracy is not enough and the overall size is too large
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[0019] The basic principle of the present invention is: when the external physical quantity changes and acts on the fiber optic sensor, the cavity length of the fiber cavity changes. When the long values are matched, a related interference signal is generated, and the measurement of the peak position of the related interference signal is completed through the linear array CCD to realize the demodulation of the cavity length information.
[0020] Based on the above principles, the present invention adopts a large fan angle Powell scribing prism and a small spot size optical fiber collimator lens to form a spot shaping system, and selects the signal channel of the French sensor and the base signal channel generated by the optical fiber reflector by controlling the optical switch, time-sharing The sensor interference signal and the base signal are collected, and the base is subtracted through data processing to realize a small-scale high-precision optical fiber F-P sensor demodu...
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The invention relates to the technical field of optical fiber sensing, in particular to a cavity length demodulation system and a demodulation method of an optical fiber F-P sensor. The invention includes SLED light source, collimator and linear array CCD, optical fiber isolator, 2×1 optical fiber coupler, 1×2 optical switch, optical fiber Faber sensor, optical fiber attenuator, optical fiber reflector, Powell prism, optical wedge and optical Switch control and signal processing unit; the outgoing light of the fiber collimator passes through the Powell prism and optical wedge to the linear array CCD detector in turn, and the cavity length of the fiber optic F-P sensor is calculated by the signal processing unit. The device and method adopt a beam expander collimation system based on a Powell prism, introduce a reference signal through an optical switch and a fiber optic mirror, and subtract the relevant interference signal base, which can significantly improve the quality of the sensing signal and the dynamic measurement range.
Description
technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a cavity length demodulation system and a demodulation method of an optical fiber F-P sensor. Background technique [0002] Due to its light weight, small size, high sensitivity, large dynamic response range and strong anti-electromagnetic interference ability, the optical fiber sensor has become one of the important research directions in the field of optical fiber sensing, especially in the field of strong electromagnetic interference, high temperature and high pressure. Applications in harsh environments such as sensors have incomparable advantages over traditional sensors. The performance of the optical fiber Fab sensor mainly depends on the back-end demodulation system. [0003] The demodulation methods for fiber-optic F-P sensor mainly include intensity demodulation and phase demodulation. The intensity demodulation method is simpler in terms of detection me...
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IPC IPC(8): G01D5/353
CPCG01D5/35312
Inventor 马志波王伟
Owner 西安光微科技有限公司