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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 6313–6320

Effect of coating thickness on the sensitivity of a humidity sensor based on an Agarose coated photonic crystal fiber interferometer

Jinesh Mathew, Yuliya Semenova, and Gerald Farrell  »View Author Affiliations


Optics Express, Vol. 21, Issue 5, pp. 6313-6320 (2013)
http://dx.doi.org/10.1364/OE.21.006313


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Abstract

We report the effect of coating thickness on the sensitivity of a relative humidity (RH) sensor based on an Agarose coated photonic crystal fiber interferometer for the first time. An experimental method is demonstrated to select an optimum coating thickness to achieve the highest sensitivity for a given RH sensing range. It is shown that the Refractive Index (RI) of the coating experienced by the mode interacting with the coating depends on the thickness of the coating. It is observed that the spectral shift of the interferometer depends on both the bulk RI change and the thickness change of the Agarose coating with respect to an RH change. The RH sensitivity of the sensor has a significant dependence on the thickness of the coating and the sensor with highest sensitivity shows a linear response for RH change in the range of 40-90% RH with a humidity resolution of 0.07%RH and a fast response time of 75 ms for an RH change from 50% to 90%.

© 2013 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(310.0310) Thin films : Thin films
(060.5295) Fiber optics and optical communications : Photonic crystal fibers

ToC Category:
Sensors

History
Original Manuscript: October 23, 2012
Revised Manuscript: October 24, 2012
Manuscript Accepted: December 5, 2012
Published: March 6, 2013

Citation
Jinesh Mathew, Yuliya Semenova, and Gerald Farrell, "Effect of coating thickness on the sensitivity of a humidity sensor based on an Agarose coated photonic crystal fiber interferometer," Opt. Express 21, 6313-6320 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-5-6313


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