光纤法珀传感器的改进型相位生成载波法解调

周朕蕊; 张国强; 邱宗甲; 郭少朋; 李群; 邵剑; 吴鹏; 陆云才

doi:10.37188/CO.2023-0108

Volume 17 Issue 2

Mar. 2024

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Article Contents

Chinese Optics > 2024 > 17(2): 312-323.

ZHOU Zhen-rui, ZHANG Guo-qiang, QIU Zong-jia, GUO Shao-peng, LI Qun, SHAO Jian, WU Peng, LU Yun-cai. An improved phase generated carrier demodulation algorithm of fiber optic fabry-perot sensor[J]. Chinese Optics, 2024, 17(2): 312-323. doi: 10.37188/CO.2023-0108

Citation:

ZHOU Zhen-rui, ZHANG Guo-qiang, QIU Zong-jia, GUO Shao-peng, LI Qun, SHAO Jian, WU Peng, LU Yun-cai. An improved phase generated carrier demodulation algorithm of fiber optic fabry-perot sensor[J]. Chinese Optics, 2024, 17(2): 312-323. doi: 10.37188/CO.2023-0108

Citation:

ZHOU Zhen-rui, ZHANG Guo-qiang, QIU Zong-jia, GUO Shao-peng, LI Qun, SHAO Jian, WU Peng, LU Yun-cai. An improved phase generated carrier demodulation algorithm of fiber optic fabry-perot sensor[J]. Chinese Optics, 2024, 17(2): 312-323. doi: 10.37188/CO.2023-0108

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An improved phase generated carrier demodulation algorithm of fiber optic fabry-perot sensor

doi: 10.37188/CO.2023-0108

ZHOU Zhen-rui^{1, 2
,},
ZHANG Guo-qiang^{1, 2
,
,},
QIU Zong-jia^1
,,
GUO Shao-peng^1
,,
LI Qun^3
,,
SHAO Jian^3
,,
WU Peng^3
,,
LU Yun-cai^3
,

1.
Institute of Electrical Engineering, Chinese Academic of Sciences, Beijing 100190, China
2.
University of Chinese Academic of Sciences, Beijing 100049, China
3.
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd, Nanjing 211102, China

Funds: Supported by the National Key Research and Development of China (No. 2022YFF0708400)

More Information

Corresponding author: zhanggqi@mail.iee.ac.cn
Received Date: 04 Jul 2023
Rev Recd Date: 22 Aug 2023

Available Online: 07 Nov 2023

Abstract

Abstract

To address the issue of non-linear distortion in the Phase Generated Carrier-Antitangent demodulation (PGC-Atan) algorithm, we have developed an extrinsic Fabry-Perot Interferometer (EFPI) sensor demodulation system based on an improved PGC-Atan algorithm. The theoretical analysis focuses on the affect of nonlinear factors on sine and cosine signals used in arctangent operation of the PGC-Atan algorithm. Such factors include deviations from optimal values of the phase modulation depth (C), companion amplitude modulation, and carrier phase delay. As a solution, we propose an improved PGC-Atan algorithm based on a correction coefficient (PGC-CC-Atan) suitable for external modulation or the case of low companion amplitude modulation scenarios. The PGC-CC-Atan algorithm generates a coefficient relating to C and carrier phase delay while excluding nonlinear parameters in the arctangent operation. Furthermore, an improved PGC-Atan algorithm that utilizes an elliptic fitting algorithm (PGC-EF-Atan) is proposed for internal modulation. The ellipse fitting technique is employed to fit the eclipse using the least squares method based on a matrix block decomposition. The pair of signals that are influenced by nonlinear factors are corrected and transformed into orthogonal signals utilizing three parameters of the ellipse. Finally, the correctness of the two improved algorithms is verified through simulations and experiments. The PGC demodulation system comprises a high dv/di VCSEL laser and a conventional cavity length F-P sensor. By comparing the demodulation performance of the PGC-Atan algorithm with that of the two improved algorithms, their effectiveness in suppressing nonlinear distortion is verified. Experimental results indicate that the two improved algorithms exhibit effective demodulation in the presence of nonlinear factors within a specific range of C values. The signal-to-noise and distortion ratio (SINAD) of demodulation result obtained from PGC-EF-Atan algorithm surpasses that of the PGC-CC-Atan algorithm by 11.602 dB, while the Total Harmonic Distortion (THD) is reduced by 10.951%. Between the two improved algorithms, the PGC-EF-Atan algorithm possesses superior demodulation linearity, accuracy, and nonlinear distortion suppression performance.
- phase generated carrier demodulation,
- nonlinear distortion,
- elliptic fitting,
- fiber optic fabry-perot sensor

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References(21)

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