Interferometric demodulation system and method for large-capacity fiber grating sensor network
A sensor network and fiber grating technology, which is applied in the field of fiber grating sensing, can solve the problems of system demodulation accuracy reduction, relative intensity noise appearance, etc., and achieve the effect of high demodulation accuracy, low signal-to-noise ratio, and broadened application functions
Active Publication Date: 2022-07-05
WUHAN UNIV OF TECH
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However, due to the use of pulse modulation technology, the hardware bandwidth of the system is increased, so that the high-frequency relative intensity noise of the broadband optical signal after filtering appears, resulting in a decrease in system demodulation accuracy
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[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:
[0018] like figure 1 and 2 The interferometric demodulation system of the large-capacity fiber grating sensor network shown in the figure includes a nano-scale broad-spectrum light source 1 (low-noise nano-scale broad-spectrum light source), a pulse light modulator 2, an optical circulator 3, a reference grating 4, A grating array sensing network 5, a first optical amplifier 6, a Mach-Zehnder interferometer 7, a photoelectric converter 8, an embedded signal processor 9 and a heating device 10, wherein the continuous light output end of the nanoscale broad-spectrum light source 1 is connected to The input end of the pulse light modulator 2, the output end of the pulse light modulator 2 is connected to the first communication end of the optical circulator 3, the second communication end of the optical circulator 3 is connected to the i...
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The invention discloses an interference type demodulation system of a large-capacity fiber grating sensor network. The continuous light output end of the nano-scale broad-spectrum light source is connected to the input end of a pulse light modulator, and the output end of the pulse light modulator is connected to an optical circulator The first communication end of the optical circulator is connected to the input end of the reference grating, the output end of the reference grating is connected to the input end of the grating array sensor network, and the third communication end of the optical circulator is connected to the input end of the first optical amplifier. The input end, the output end of the first optical amplifier is connected to the input end of the Mach-Zehnder interferometer, and the three-way signal output ends of the Mach-Zehnder interferometer are respectively connected to the corresponding signal input ends of the embedded signal processor through the photoelectric converter. The signal processor controls the heating device to control the temperature of any one of the interference arms of the Mach-Zehnder interferometer. The invention effectively improves the signal-to-noise ratio and the demodulation precision of the system on the premise of ensuring the demodulation speed and the multiplexing capacity of the sensors.
Description
technical field [0001] The invention relates to the technical field of fiber grating sensing, in particular to an interference type demodulation system and method for a large-capacity fiber grating sensing network. Background technique [0002] Fiber Bragg Grating (FBG) sensing is the most potential sensing technology in the sensing field. It utilizes the characteristic that the central wavelength of FBG is sensitive to temperature / strain to realize sensing and monitoring of complex working conditions. In terms of performance optimization, through large-scale networking and increasing the number of sensors, the sensing density of the sensor network can be improved; by optimizing the demodulation method and shortening the sensor demodulation time, the response speed of the sensor network can be improved; by improving the system design , reducing the system noise level, which can improve the measurement accuracy of the sensor network. However, the current FBG sensing system s...
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IPC IPC(8): G01D5/353
CPCG01D5/35329Y02D30/70G01D5/35316G01D5/35303H04B10/548
Inventor 李政颖王加琪王洪海
Owner WUHAN UNIV OF TECH