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Ultra low frequency phase generated carrier demodulation technique for fiber sensors
Wang, Lin; He, Jun; Li, Fang; Liu, Yuliang; Wang, L.(wlcas@semi.ac.cn)
2011
Source PublicationZhongguo Jiguang/Chinese Journal of Lasers
ISSN02587025
Volume38Issue:4Pages:405001
AbstractA high resolution ultra low frequency phase generated carrier(PGC) demodulation technique for interferometric fiber sensors is proposed. The differential cross multiplication(DCM) algorithm and the Arctangent algorithm of PGC technique are analyzed theoretically and simulated by computer for ultra low frequency demodulation. And the results show that an unnecessary random direct current(DC) drift is induced in the recovered signal of DCM-PGC, but it doesn't exit in that of Arctangent-PGC. To demonstrate the conclusion, an optical fiber interferometer-based ultra low frequency sensing system is set up, and the comparable experiments of DCM-PGC and Arctangent-PGC are carried out. The experimental results show that only Arctangent-PGC can be used for ultra low frequency demodulation, for it avoids the problem of DC drift as DCM-PGC. At last the ultra low frequency demodulation system is achieved by Arctangent-PGC, and the testing results show that the system has the lowest frequency of0.01 Hz, a minimum detectable phase shift of4×10-4 rad/√Hz, a dynamic range of110 dB@1 Hz and a linearity of99.99%.
metadata_83光电系统实验室
KeywordAlgorithms Fiber Optic Sensors Fibers Interferometers Optical Fibers Optical Variables Measurement Sensors
Subject Area光电子学
Indexed ByEI
Language中文
Date Available2012-06-14
Document Type期刊论文
Identifierhttp://ir.semi.ac.cn/handle/172111/23094
Collection光电系统实验室
Corresponding AuthorWang, L.(wlcas@semi.ac.cn)
Recommended Citation
GB/T 7714
Wang, Lin,He, Jun,Li, Fang,et al. Ultra low frequency phase generated carrier demodulation technique for fiber sensors[J]. Zhongguo Jiguang/Chinese Journal of Lasers,2011,38(4):405001.
APA Wang, Lin,He, Jun,Li, Fang,Liu, Yuliang,&Wang, L..(2011).Ultra low frequency phase generated carrier demodulation technique for fiber sensors.Zhongguo Jiguang/Chinese Journal of Lasers,38(4),405001.
MLA Wang, Lin,et al."Ultra low frequency phase generated carrier demodulation technique for fiber sensors".Zhongguo Jiguang/Chinese Journal of Lasers 38.4(2011):405001.
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