A Zero-Cross Detection Algorithm for Cavity-Length Interrogation of Fiber-Optic Fabry-Perot Sensors

Zhibo Ma; Zechen Song; Xirui Huang; Tongxin Guo; Weizheng Yuan; Haibin Chen; Tianyang Zhang; Wei Wang

doi:10.3390/s19183868

A Zero-Cross Detection Algorithm for Cavity-Length Interrogation of Fiber-Optic Fabry-Perot Sensors

Sensors (Basel). 2019 Sep 7;19(18):3868. doi: 10.3390/s19183868.

Authors

Zhibo Ma^{1

2}, Zechen Song^{3

4}, Xirui Huang^{5

6}, Tongxin Guo^{7

8}, Weizheng Yuan^{9

10}, Haibin Chen^{11

12}, Tianyang Zhang^{13

14}, Wei Wang^{15

16}

Affiliations

¹ Key Lab of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China. zbma@nwpu.edu.cn.
² Shaanxi Key Lab of MEMS/NEMS, Northwestern Polytechnical University, Xi'an 710072, China. zbma@nwpu.edu.cn.
³ Key Lab of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China. zechen_song@foxmail.com.
⁴ Shaanxi Key Lab of MEMS/NEMS, Northwestern Polytechnical University, Xi'an 710072, China. zechen_song@foxmail.com.
⁵ School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China. huangxrxatu@163.com.
⁶ Shaanxi Province Key Lab of Photoelectric Measurement and Instrument Technology, Xi'an Technological University, Xi'an 710021, China. huangxrxatu@163.com.
⁷ Key Lab of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China. guo-tx9199@mail.nwpu.edu.cn.
⁸ Shaanxi Key Lab of MEMS/NEMS, Northwestern Polytechnical University, Xi'an 710072, China. guo-tx9199@mail.nwpu.edu.cn.
⁹ Key Lab of Micro/Nano Systems for Aerospace, Ministry of Education, Northwestern Polytechnical University, Xi'an 710072, China. yuanwz@nwpu.edu.cn.
¹⁰ Shaanxi Key Lab of MEMS/NEMS, Northwestern Polytechnical University, Xi'an 710072, China. yuanwz@nwpu.edu.cn.
¹¹ School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China. chenhaibin@xatu.edu.cn.
¹² Shaanxi Province Key Lab of Photoelectric Measurement and Instrument Technology, Xi'an Technological University, Xi'an 710021, China. chenhaibin@xatu.edu.cn.
¹³ School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China. zhangty_xatu@163.com.
¹⁴ Shaanxi Province Key Lab of Photoelectric Measurement and Instrument Technology, Xi'an Technological University, Xi'an 710021, China. zhangty_xatu@163.com.
¹⁵ School of Optoelectronic Engineering, Xi'an Technological University, Xi'an 710021, China. wangwei@xatu.edu.cn.
¹⁶ Shaanxi Province Key Lab of Photoelectric Measurement and Instrument Technology, Xi'an Technological University, Xi'an 710021, China. wangwei@xatu.edu.cn.

Abstract

A zero-cross detection algorithm was proposed for the cavity-length interrogation of fiber-optic Fabry-Perot (FP) sensors. The method can avoid the inaccuracy of peak determination in the conventional peak-to-peak method for the cavity-length interrogation of fiber-optic FP sensors caused by the slow variation of the spectral power density in peak neighboring regions. Both simulations and experiments were carried out to investigate the feasibility and performance of the zero-cross detection algorithm. Fiber-optic FP sensors with cavity lengths in the range of 150-1000 μm were successfully interrogated with a maximum error of 0.083 μm.

Keywords: Fabry–Perot cavity; fiber-optic sensor; peak-to-peak method; zero-cross detection.

Abstract

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