High stability PGC demodulation technique for fiber-optic interferometric sensor

Wenzhe Xiao; Jing Cheng; Dawei Zhang; Yong Kong; Hualong Ye; Jun He

doi:10.12086/oee.2022.210368

Opto-Electronic Engineering, Volume. 49, Issue 3, 210368-1(2022)

High stability PGC demodulation technique for fiber-optic interferometric sensor

Wenzhe Xiao1... Jing Cheng2, Dawei Zhang1,*, Yong Kong3, Hualong Ye1 and Jun He1 |Show fewer author(s)

¹School of Optical Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

²Department of Materials Science, Fudan University, Shanghai 200433, China

³School of Electronic and Electrical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

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Fig. 1. Schematics of the PGC demodulation algorithm. (a) PGC-Arctan; (b) PGC-DCM; (c) PGC-SDD; (d) PGC-SDD-DSM

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Fig. 2. Demodulation signals of different PGC demodulation algorithms with C=1.5 rad, 2.0 rad, 2.5 rad, 3.0 rad and 3.5 rad. (a) PGC-SDD-DSM; (b) PGC-SDD; (c) PGC-Arctan; (d) PGC-DCM

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Fig. 3. Schematic of experimental setup

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Fig. 4. Original signal

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Fig. 5. Demodulation time domain results of different PGC algorithms when C=1.5 rad. (a) PGC-DCM; (b) PGC-Arctan; (c) PGC-SDD; (d) PGC-SDD-DSM

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Fig. 6. Frequency spectrums of the demodulation results of different PGC algorithms when C=1.5 rad. (a) PGC-DCM; (b) PGC-Arctan; (c) PGC-SDD; (d) PGC-SDD-DSM

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Fig. 7. THD of the proposed PGC algorithm with modulation depth C

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Fig. 8. SINAD of the proposed PGC algorithm with modulation depth C

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Fig. 9. Demodulated signal waveform (red) and original signal (blue)

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Fig. 10. Demodulated signal waveform (green) and original signal (blue)

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Fig. 11. Dynamic range of the demodulation system based on the PGC-SDD-DSM algorithm

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Table 1. Comparisons of four PGC demodulation algorithms

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Table 1. Comparisons of four PGC demodulation algorithms

Parameters	Demodulation formula	Modulation depth(C)	Light intensity disturbance(LID)	Total harmonic distortion(THD)
PGC-DCM	$S_{PGC - DCM} (t) = B^{2} G H J_{1} (C) J_{2} (C) φ (t)$	Sensitive	Sensitive	Low THD
PGC-Arctan	$S_{PGC - Arctan} (t) = arctan {[\frac{G J_{1} (C)}{H J_{2} (C)}] \tan φ (t)}$	Sensitive	Non-sensitive	High THD
PGC-SDD	$S_{PGC - SDD} (t) = [J_{1} (C) / J_{2} (C)] \cdot φ (t)$	Sensitive	Non-sensitive	Low THD
PGC-SDD-DSM	$S_{PGC - SDD - DSM} = φ (t)$	Non-sensitive	Non-sensitive	Low THD

Table 2. Performance comparison of demodulation results of four algorithms
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Table 2. Performance comparison of demodulation results of four algorithms
PGC-DCM PGC-Arctan PGC-SDD PGC-SDD-DSM
SINAD/dB 24.69 11.37 29.18 35.56
THD/ (%) 0.060 0.690 0.057 0.047

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Wenzhe Xiao, Jing Cheng, Dawei Zhang, Yong Kong, Hualong Ye, Jun He. High stability PGC demodulation technique for fiber-optic interferometric sensor[J]. Opto-Electronic Engineering, 2022, 49(3): 210368-1

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