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Proceedings Paper

Improving demodulation accuracy of low-coherence interferometer against spatial-frequency nonlinearity
Author(s): Shuang Wang; Tiegen Liu; Junfeng Jiang; Kun Liu; Jinde Yin; Fan Wu; Bofu Zhao; Lei Xue; Yunqiao Mei; Zhenhai Wu
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Paper Abstract

We present an effective method to compensate the spatial-frequency nonlinearity for polarized low-coherence interferometer with location-dependent dispersion element. Through the use of location-dependent dispersive characteristics, the method establishes the exact relationship between wave number and discrete Fourier transform (DFT) serial number. The jump errors in traditional absolute phase algorithm are also avoided with nonlinearity compensation. We carried out experiments with an optical fiber Fabry-Perot (F-P) pressure sensing system to verify the effectiveness. The demodulated error is less than 0.139kPa in the range of 170kPa when using our nonlinearity compensation process in the demodulation.

Paper Details

Date Published: 20 December 2013
PDF: 6 pages
Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 90440M (20 December 2013); doi: 10.1117/12.2035276
Show Author Affiliations
Shuang Wang, Tianjin Univ. (China)
Tiegen Liu, Tianjin Univ. (China)
Junfeng Jiang, Tianjin Univ. (China)
Kun Liu, Tianjin Univ. (China)
Jinde Yin, Tianjin Univ. (China)
Fan Wu, Tianjin Univ. (China)
Bofu Zhao, AVIC Chengdu CAIC Electronics Co., Ltd. (China)
Lei Xue, AVIC Chengdu CAIC Electronics Co., Ltd. (China)
Yunqiao Mei, AVIC Chengdu CAIC Electronics Co., Ltd. (China)
Zhenhai Wu, Tianjin Univ. (China)


Published in SPIE Proceedings Vol. 9044:
2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Brian Culshaw; Xuping Zhang; Anbo Wang, Editor(s)

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