3 May 2013 Photonic crystal fiber coil sensor for water-depth sensing
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Abstract
We fabricate a PCF coil sensor for water-depth sensing by winding a PCF on a plastic straw. Due to the bending-induced birefringence along the PCF, we can observe clear interference pattern in the output spectrum by placing the PCF coil into a Sagnac fiber loop. As we horizontally immerse the fabricated PCF coil into water, a nonlinear relationship between the water depth and the wavelength shift can be obtained. We have also measured the interference spectrum by vertically immersing the PCF coil into water. We can observe a linear relationship between the water depth and the wavelength shift, and the measured water-depth sensitivity for vertical immersion is -1.17 nm/mm.
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Chen-Feng Fan, Chen-Feng Fan, Chin-Ping Yu, Chin-Ping Yu, } "Photonic crystal fiber coil sensor for water-depth sensing", Proc. SPIE 8775, Micro-structured and Specialty Optical Fibres II, 877506 (3 May 2013); doi: 10.1117/12.2017093; https://doi.org/10.1117/12.2017093
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