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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 27 — Sep. 20, 2011
  • pp: 5310–5314

Zinc oxide nanoparticle based optical fiber humidity sensor having linear response throughout a large dynamic range

R. Aneesh and Sunil K. Khijwania  »View Author Affiliations

Applied Optics, Vol. 50, Issue 27, pp. 5310-5314 (2011)

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The main objective of the present work is to develop an optical fiber relative humidity (RH) sensor having a linear response throughout over the widest possible dynamic range. We report an optical fiber RH sensor based on the evanescent wave absorption spectroscopy that fulfills this objective. The fiber sensor employs a specific nanoparticle (zinc oxide) doped sol–gel nanostructured sensing film of optimum thickness, synthesized over a short length of a centrally decladded straight and uniform optical fiber. A detailed experimental investigation is carried out to analyze the sensor response/characteristics. Fiber sensor response is observed to be linear throughout the dynamic range as wide as 4% to 96% RH. The observed linear sensitivity for the fiber sensor is 0.0012 RH 1 . The average response time of the reported sensor is observed to be as short as 0.06 s during the humidification. In addition, the sensor exhibited a very good degree of reversibility and extremely high reliability as well as repeatability.

© 2011 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: September 30, 2010
Manuscript Accepted: June 17, 2011
Published: September 16, 2011

R. Aneesh and Sunil K. Khijwania, "Zinc oxide nanoparticle based optical fiber humidity sensor having linear response throughout a large dynamic range," Appl. Opt. 50, 5310-5314 (2011)

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