Volume 14 Issue 5
Sep.  2021
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Chinese Optics  > 2021  >  14(5): 1259-1272.
ZHANG Xiong-xing, LV Wen-tao, ZHANG Tian-yang, KOU Wan-ying, CHEN Qing-qing, WANG Wei. Design of optical wedge demodulation system for fiber Fabry-Perot sensor[J]. Chinese Optics, 2021, 14(5): 1259-1272. doi: 10.37188/CO.2020-0204
Citation: ZHANG Xiong-xing, LV Wen-tao, ZHANG Tian-yang, KOU Wan-ying, CHEN Qing-qing, WANG Wei. Design of optical wedge demodulation system for fiber Fabry-Perot sensor[J]. Chinese Optics, 2021, 14(5): 1259-1272. doi: 10.37188/CO.2020-0204
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Design of optical wedge demodulation system for fiber Fabry-Perot sensor

  • School of Optoelectronics Engineering, Xi’an Technological University, Xi’an, Shannxi 710021, China

Funds:  Supported by Natural Science Basic Research Project of Shaanxi Province (No. 2020JM-560); Key Scientific Research Project of Education Department of Shaanxi Province (No. 20JS060)
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  • Author Bio:

    ZHANG Xiong-xing (1979—), male, born in Xiangyang City, Hubei Province. Master’s degree, associate professor. He is mainly engaged in the research of optical fiber sensing and optoelectronic measurement. E-mail: zhangxiongxing@xatu.edu.cn

    WANG Wei (1973—), male, born in Jiyuan, Henan Province. Doctoral degree, professor. He is mainly engaged in the research of optical fiber sensing and optoelectronic testing. E-mail: wangwei@xatu.edu.cn

  • Corresponding author: wangwei@xatu.edu.cn
  • Received Date: 23 Nov 2020
  • Rev Recd Date: 07 Jan 2021
    • Available Online: 12 Aug 2021
  • Publish Date: 18 Sep 2021
    Abstract
  • In order to realize the demodulation of the cavity length of the fiber-optic FP sensor, a new optical wedge-type non-scanning correlation demodulation system is proposed, and the characteristics and structure of the devices used in the system are analyzed and studied. First, by simulating the light sources with different spectral distributions and the optical wedges with different surface reflectivities, the correlation interference signals are analyzed and the optimal structure parameters of the system components are given. Then by comparing the light intensity distribution characteristics of the Powell prism and cylindrical lens on the linear array CCD, more uniform spectral distribution is achieved. Finally, the specific implementation scheme and data processing method of the demodulation system are given. The experimental results show that when the light source spectrum has a Gaussian distribution and large spectral width and the reflectivity of the wedge surface is $R = 0.5$, the characteristics of the correlation interference signal are obvious and convenient for demodulation. Finally, the demodulation system achieves the demodulation effect with an error of less than 0.025% within the cavity length range of 60 μm-100 μm. This optical wedge-type non-scanning correlation demodulation method can realize the sensing demodulation of the fiber-optic FP cavity and improve the power adaptability of different types of fiber-optic FP sensors.

     

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