Ratio fringe counting method based on dual F-P interferometer and displacement sensor demodulating system of method
A displacement sensor and fringe counting technology, applied in instruments, measuring devices, optical devices, etc., can solve the problems of low system accuracy and the inability of fiber end face processing technology to meet the accuracy requirements, and achieve the effect of reducing complexity
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[0041] The technical solutions of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.
[0042] refer to Figure 1 ~ Figure 2 As shown, the displacement sensor demodulation system based on the ratio fringe counting method of the double F-P interferometer according to the present invention includes a laser 1, a fiber isolator 2, a first fiber coupler 3, a second fiber coupler 4, a third Optical fiber coupler 5, sensing unit 6, photodetector 7, preamplification unit 8, DSP signal processing module 9 and peripheral display unit 10, the output end of described laser 1 is connected with the input port of optical fiber isolator 2, The output port of the fiber isolator 2 is connected with the input end of the first fiber coupler 1, and the output port of the first fiber coupler 1 is respectively connected with the input port a of the second fiber coupler 2 and the input port of the third fiber coupler 3 b is connect...
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