Photonic crystal fiber coil sensor for water-depth sensing

Chen-Feng Fan; Chin-Ping Yu

doi:10.1117/12.2017093

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3 May 2013 Photonic crystal fiber coil sensor for water-depth sensing

Chen-Feng Fan, Chin-Ping Yu

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Proceedings Volume 8775, Micro-structured and Specialty Optical Fibres II; 877506 (2013) https://doi.org/10.1117/12.2017093
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

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 and 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); https://doi.org/10.1117/12.2017093

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