A simple demodulation algorithm for optical SPR sensor based on all-phase low-pass filters

Jinying Ma; Yuzhen Cao; Kun Liu; Xiangdong Huang; Junfeng Jiang; Tao Wang; Meng Xue; Pengxiang Chang; Tiegen Liu

doi:10.1117/12.2281236

10 January 2018 A simple demodulation algorithm for optical SPR sensor based on all-phase low-pass filters

Jinying Ma, Yuzhen Cao, Kun Liu, Xiangdong Huang, Junfeng Jiang, Tao Wang, Meng Xue, Pengxiang Chang, Tiegen Liu

Proceedings Volume 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications; 106180N (2018) https://doi.org/10.1117/12.2281236
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

Surface Plasmon resonance (SPR) technique is gradually growing as a research focus in optical area, which has been widely applied in many disciplines. The fiber-based SPR sensor, combining the advantages of fiber and SPR phenomenon, will lead to more tremendous application areas. The design and fabrication of different fiber SPR sensors are always be focuses of researchers in recent year, but the characteristic wavelength demodulation of the SPR sensor didn’t obtain enough attention. In this paper, the detection system for a fiber-based SPR sensor was presented first, and the detection mechanism of the refractive index sensing was obtained theoretically. Based on the theoretical simulation and analysis, the analytical expression of the all-phase low-pass filters was deduced, which is used for the de-noising of the original spectrum for the SPR sensing system, leading to resonance wavelength extraction only by calculating the derivative of the de-noised signal. So the resonance wavelength of the SPR sensor can be easily obtained by using this simple demodulation algorithm. Based on the realization of the system, the refractive index sensing of alcohol solution was carried out. And a good linear relationship between the refractive index of the solution and the characteristic wavelength of the SPR sensor can be obtained, with refractive index sensitivity and fitting error of 2048.5 nm/RIU and 5.69 nm respectively.

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Jinying Ma, Yuzhen Cao, Kun Liu, Xiangdong Huang, Junfeng Jiang, Tao Wang, Meng Xue, Pengxiang Chang, and Tiegen Liu "A simple demodulation algorithm for optical SPR sensor based on all-phase low-pass filters", Proc. SPIE 10618, 2017 International Conference on Optical Instruments and Technology: Advanced Optical Sensors and Applications, 106180N (10 January 2018); https://doi.org/10.1117/12.2281236

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