In this work, we employed the Empirical mode decomposition (EMD) algorithm into the demodulation spectrum of the long period fiber grating sensing experiment. After data processing by the EMD-based filtering algorithm, the disordered noise of the fiber Bragg fiber grating (LPFG)’s spectrum caused by the laser source and mode coupling can be effectively eliminated so that the single valley wavelength of LPG can be much more precisely located. As a consequence, based on the proposed algorithm, the related sensitivity of refractive index solution detection can be reached 11 nm/RIU, 18 nm/RIU, 61.3 nm/RIU and 241 nm/RIU in 1.33-1.36, 1.37-1.39, 1.40-1.43, and 1.43-1.45 refractive index region, respectively.
Tungsten disulfide (WS2) nanosheets is a promising two-dimension (2D) material for offering lots opportunities in the development of new biological and chemical sensors and sensing strategies. Fiber SPR sensor is a powerful tool in the field of biology and chemistry. In this work, we simulated the effect of different tickness WS2 nanosheets on the fiber SPR sensor. The result show that, the SPR sensor perform best when WS2 nanosheets is 9.6 nm. Its refractive index sensitivity is 2018.4nm/RIU, the full width at half maximum is 151.4 nm, and the quality factor is 1.333.
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