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High Stability PGC-EFA-DCM Demodulation Algorithm Integrated With a PID Module
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DOI：10.1109/JLT.2022.3209018.png)
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Phase generated carrier (PGC) demodulation technology has been widely used in fiber-optic interferometric sensors while nonlinearity is always accompanying with the scheme. We propose a highly stable PGC demodulation algorithm combining internal modulation, ellipse fitting algorithm (EFA), phase modulation depth (C) self-calibration and differential-cross-multiplying (DCM). A low frequency triangular signal is added to the laser modulation, which ensures the effectiveness of the EFA under small signal condition. And the real-time C value is calculated by using the ellipse fitting parameters and calibrated to the optimal value of 2.63 rad by a closed loop proportion integration differentiation (PID) module. Furthermore, nonlinear distortions are suppressed by the EFA. Experimental results show that the signal-to-noise and distortion ratio (SINAD) and total harmonic distortion (THD) of the proposed scheme are improved by 13.61 dB and 0.12% than the conventional PGC-DCM algorithm. The standard deviation of C decreased from 0.0178 rad to 0.0058 rad in 1024 seconds. The dynamic range, linearity and phase resolution of the system reach 117.73 dB @ 1 kHz, 99.99% and 4.6 mu rad/Hz, respectively.
Keyword:
Ellipse fitting algorithm (EFA)
nonlinearity
phase generated carrier (PGC) demodulation
phase modulation depth
proportion integration differentiation (PID)
期刊
IF:
4.8
论文数:
1.7W
被引数:
3.8W
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引用论文
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