30 January 2012 Refractive-index gradient sensor based on the structured fiber Bragg grating
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Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 835118 (2012) https://doi.org/10.1117/12.913744
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia
We demonstrate a structured fiber Bragg grating (FBG) sensor for the measurement of the refractive-index (RI) gradient of the inhomogeneous liquid medium. The double-layer fiber waveguide models and the transfer matrix method are utilized to calculate the reflection spectrum of structured FBG under inhomogeneous liquid medium, the refractive-index (RI) distribution of which is linear and range from 1.330 to 1.360, showing that the reflection spectrum of the structured FBG would split into several tiny resonant peaks, and the D-value of the wavelengths of the tow resonant peaks at the tow sides of reflection spectrum was approximately proportional to the RI gradient. In the experiment, a FBG was etched to a diameter of about 5.73μm for the RI gradient measurement of the diffusion process of the sucrose solution in the micro channel, the experimental results conformed the rationality of the simulated results, indicating the possibility of the RI gradient measurement by using the structured FBG sensors.
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Bin-bin Luo, Ming-fu Zhao, Xiao-jun Zhou, Sheng-hui Shi, Xi Han, Ying Wang, "Refractive-index gradient sensor based on the structured fiber Bragg grating", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 835118 (30 January 2012); doi: 10.1117/12.913744; https://doi.org/10.1117/12.913744

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