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6 May 2011 Agarose coated single mode fiber bend for monitoring humidity
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A relative humidity (RH) sensor measuring wide range of humidity variations based on a bent single mode optical fiber coated with Agarose is reported. When exposed to moisture the change in refractive index of the Agarose layer results in changes in the degree of coupling of the core mode to cladding modes and corresponding changes in the output power are observed in the transmission spectrum of the Agarose coated bent fiber. The sensor shows linear response in the range 25 %- 90 % RH. We show that humidity sensitivity of the sensor is wavelength dependant and high sensitivity is observed at higher wavelengths. The sensor response is fast, stable and reversible in nature.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jinesh Mathew, Yuliya Semenova, Ginu Rajan, and Gerald Farrell "Agarose coated single mode fiber bend for monitoring humidity", Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 807317 (6 May 2011);

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