Three-wavelength phase demodulation technique for extrinsic Fabry-Perot interferometric sensors

被引：1
|
作者：
Zhang, Shuhuan [1 ,2 ]
Peng, Min [1 ,2 ]
Dong, Jiyu [3 ]
Li, Shushu [4 ]
Ren, Qilong [4 ]
机构：
[1] Xinjiang Inst Engn, Dept Phys, Urumqi 830091, Peoples R China
[2] Xinjiang Inst Engn, Key Lab New Energy & Mat Res, Urumqi 830023, Peoples R China
[3] Shanxi Datong Univ, Coll Phys & Elect Sci, Datong 037009, Peoples R China
[4] Xinjiang Inst Engn, Sch Energy Engn, Urumqi 830091, Peoples R China
来源：
OPTICAL FIBER TECHNOLOGY | 2023年 / 81卷
关键词：
Fiber optical sensors; Extrinsic Fabry-Perot interferometer; Dynamic signals; Phase demodulation; FIBEROPTIC INTERFEROMETER; EFPI SENSORS;
D O I：
10.1016/j.yofte.2023.103578
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A three-wavelength quadrature phase compensation method for recovering dynamic signals in extrinsic Fabry-Perot interferometers (EFPIs) is proposed and experimentally demonstrated. The influence of the direct current component is eliminated by using three symmetrical interferometric signals, and two orthogonal signals are obtained by the phase compensation algorithm to extract the phase change. A sinewave with a frequency of 1000 Hz was applied on an EFPI sensor. The cavity length of the EFPI sensor is 643.0299 mu m. The demodulated signal is a sinewave with a frequency of 1000 Hz. The demodulated frequency shows good agreement with the frequency of the applied signal. This technique is suitable for measuring EFPI sensor cavity length changes under dynamic signals.
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页数：7
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