Improving demodulation accuracy of low-coherence interferometer against spatial-frequency nonlinearity

Shuang Wang; Tiegen Liu; Junfeng Jiang; Kun Liu; Jinde Yin; Fan Wu; Bofu Zhao; Lei Xue; Yunqiao Mei; Zhenhai Wu

doi:10.1117/12.2035276

20 December 2013 Improving demodulation accuracy of low-coherence interferometer against spatial-frequency nonlinearity

Shuang Wang, Tiegen Liu, Junfeng Jiang, Kun Liu, Jinde Yin, Fan Wu, Bofu Zhao, Lei Xue, Yunqiao Mei, Zhenhai Wu

Proceedings Volume 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 90440M (2013) https://doi.org/10.1117/12.2035276
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

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.

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Shuang Wang, Tiegen Liu, Junfeng Jiang, Kun Liu, Jinde Yin, Fan Wu, Bofu Zhao, Lei Xue, Yunqiao Mei, and Zhenhai Wu "Improving demodulation accuracy of low-coherence interferometer against spatial-frequency nonlinearity", Proc. SPIE 9044, 2013 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 90440M (20 December 2013); https://doi.org/10.1117/12.2035276

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KEYWORDS

Birefringence

Demodulation

Charge-coupled devices

Interferometers

Light sources

Optical fibers

Sensing systems

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