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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 19 — Jul. 1, 2006
  • pp: 4567–4571

Optical fiber long-period grating humidity sensor with poly(ethylene oxide)∕cobalt chloride coating

Maria Konstantaki, Stavros Pissadakis, Stergios Pispas, Nicholas Madamopoulos, and Nikos A. Vainos  »View Author Affiliations

Applied Optics, Vol. 45, Issue 19, pp. 4567-4571 (2006)

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A long-period fiber grating (LPFG) humidity sensor is reported utilizing poly(ethylene oxide)∕cobalt chloride (PEO/CoCl2) as a hybrid hygrosensitive cladding coating. A thin overlay of the material is deposited on the LPFG and with exposure to different ambient humidity levels, its spectral properties are modified. The material parameters associated with the sensing mechanism may include those of refractive index, absorption, and morphological alterations of the overlaid material. Relative humidity variations in the range from 50% to 95% have been detected with a resolution better than 0.2%. The response time constant of the fiber sensor is of the order of a few hundred milliseconds.

© 2006 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(160.4670) Materials : Optical materials
(160.4760) Materials : Optical properties
(350.2770) Other areas of optics : Gratings

Original Manuscript: December 6, 2005
Manuscript Accepted: February 21, 2006

Virtual Issues
Vol. 1, Iss. 8 Virtual Journal for Biomedical Optics

Maria Konstantaki, Stavros Pissadakis, Stergios Pispas, Nicholas Madamopoulos, and Nikos A. Vainos, "Optical fiber long-period grating humidity sensor with poly(ethylene oxide)/cobalt chloride coating," Appl. Opt. 45, 4567-4571 (2006)

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