Chinese Journal of Lasers, Volume. 47, Issue 9, 904002(2020)
Nonlinear Error Compensation Method for PGC Demodulation Based on Kalman Filtering
Figures & Tables(8)
Fig. 1. Phase demodulation errors of PGC-Arctan algorithm in different situations. (a) Phase delay change; (b) modulation depth change
Fig. 3. Kalman filter estimates convergence trend graph of orthogonal component parameters. (a) Alternating current amplitude; (b) direct current bias
Fig. 4. Sine phase modulation interferometer based on EOM. (a) Principle block diagram; (b) experimental device
Fig. 5. Phase demodulation error before and after compensation. (a) Before compensation; (b) after compensation
Fig. 6. Displacement measurement results before and after compensation at different frequencies. (a) 100 Hz; (b) 200 Hz
Fig. 7. Non-linear error analysis results. (a) Error results of displacement measurement; (b) FFT analysis result
Table 1. Simulation results of orthogonal component parameters
View tableTable 1. Simulation results of orthogonal component parameters
Process X(t) Y(t) X0(t) Y0(t) Set value 0.90000 1.10000 -0.03500 -0.09000 Kalman estimated value 0.90001 1.10003 -0.03496 -0.09001 Ellipse fitting value 0.90002 1.10003 -0.03504 -0.09003 Deviation of two methods -0.00001 0 0.00008 0.00020
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Yan Liping, Zhou Chunyu, Xie Jiandong, Chen Benyong, Lou Yingtian, Yang Tao. Nonlinear Error Compensation Method for PGC Demodulation Based on Kalman Filtering[J]. Chinese Journal of Lasers, 2020, 47(9): 904002
Paper Information
Category: Measurement and metrology
Received: Mar. 13, 2020
Accepted: --
Published Online: Sep. 16, 2020
The Author Email: Benyong Chen (chenby@zstu.edu.cn)
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