Optical fiber grating sensor demodulation instrument and method based on dynamic scanning
A technology of sensor demodulator and fiber grating, which is applied in the direction of using optical devices to transmit sensing components, instruments, and optical devices, etc., can solve the problems of low demodulation speed, inconvenient use, and high cost of use of demodulation technology, Achieve the effect of low use cost, high use cost and high demodulation speed
Inactive Publication Date: 2013-06-19
ZHONGBEI UNIV
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[0003] In order to solve the problems of low demodulation speed, low demodulation accuracy, inconvenient use, high use cost and narrow application range of the existing fiber grating demodulation technology, the present invention provides a fiber grating sensing solution based on dynamic scanning. Adjustment and method
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[0023]A fiber grating sensor demodulator based on dynamic scanning, including broadband light source 1, tunable filter 2, fiber coupler 3, isolator 4, fiber grating 5, etalon 6, first photodetector 7, second photoelectric Detector 8, first signal amplification conditioning circuit 9, second signal amplification conditioning circuit 10, multi-channel synchronous A / D converter 11, demodulation control circuit 12 based on FPGA, computer 13, D / A converter 14, and High-voltage driving amplifier circuit 15; wherein, the signal output end of the broadband light source 1 is connected with the signal input end of the tunable filter 2; the signal output end of the tunable filter 2 is connected with the signal input end of the fiber coupler 3; the fiber coupler The signal output end of 3 is connected with the signal input end of the isolator 4, the signal input end of the fiber grating 5, and the signal input end of the first photodetector 7; the signal output end of the isolator 4 is con...
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The invention relates to a technology of demodulation of optical fiber gratings, in particular to an optical fiber grating sensor demodulation instrument and an optical fiber grating sensor demodulation method based on dynamic scanning and aims to solve the problems that the demodulation speed and the demodulation accuracy in the conventional optical fiber grating demodulation technology are low, and the conventional demodulation instrument is inconvenient to use and high in using cost and has a narrow application range. The demodulation instrument comprises a broadband light source, a tunable filter, an optical fiber coupler, an isolation device, an optical fiber grating, an etalon, a first photoelectric detector, a second photoelectric detector, a first signal amplification and conditioning circuit, a second signal amplification and conditioning circuit, a multi-path synchronous analog / digital (A / D) converter, a field programmable gate array (FPGA)-based demodulation control circuit, a computer, a D / A converter and a high-voltage driving amplifying circuit and is applicable to optical fiber grating sensors.
Description
technical field [0001] The invention relates to a fiber grating demodulation technology, in particular to a dynamic scanning-based fiber grating sensor demodulator and method. Background technique [0002] Fiber gratings can convert external strain signals (such as stress signals, strain signals, vibration signals, temperature change signals, etc.) into central wavelength change signals of their reflection spectrum. Therefore, by properly packaging the fiber grating, a fiber grating sensor can be made. Fiber Bragg grating sensors are widely used in the fields of long-distance optical sensing and optical communication due to their characteristics of being free from electromagnetic radiation interference, small size, simple fabrication, and wavelength sensitivity. In practical applications, in order to ensure that the fiber grating sensor can work normally, it is necessary to demodulate the fiber grating. At present, the fiber grating demodulation technology is mainly divide...
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Inventor 马游春李锦明谭秋林苏淑靖文丰丑修建闫树斌王常江
Owner ZHONGBEI UNIV