Optical fibre grating digital demodulation method and system based on autocorrelation principle
A fiber grating and digital demodulation technology, which is applied in the coupling of optical waveguides and the transmission of sensing components by optical devices, can solve the problems of high price, low measurement accuracy of fiber grating sensing system demodulation technology, and failure to meet the actual needs of the project. And other issues
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[0068] The present invention will be further described below in conjunction with the drawings and embodiments.
[0069] In Figure 1 and Figure 2, the fiber grating autocorrelation digital demodulation system includes a broadband light source 1 and several fiber grating sensors 2 connected in series. The light source 1 is connected to the fiber grating sensor 2 via a 2×2 coupler 3, and the coupling The device is also connected to the tunable filter 4, the tunable filter 4 is connected to the photodetector 5, and the photodetector 5 is connected to the preamplifier 6, the digital-to-analog converter 7, and the digital-to-analog converter 7 is connected to the DSP chip. The input terminal of the digital controller 8 is connected; the output terminal of the digital controller 8 is connected to the control input terminal of the tunable filter 4 via the electromechanical controller 9 and the electromechanical modulation system 10 in turn. The tunable filter 4 can be a Bragg grating, a l...
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