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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 18 — Jun. 20, 2013
  • pp: 4287–4293

High-sensitivity optical humidity sensor based on a thin dielectric waveguide

R. A. S. Ribeiro, J. F. M. Domenegueti, and S. C. Zilio  »View Author Affiliations


Applied Optics, Vol. 52, Issue 18, pp. 4287-4293 (2013)
http://dx.doi.org/10.1364/AO.52.004287


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Abstract

A low-cost, high-sensitivity humidity sensor based on a low-loss dielectric thin film waveguide (WG) is presented. The guided mode is produced by coupling laser light into the film by optical tunneling through a solid gap deposited on the base of a semi-cylindrical lens. The light reflected from this optical system carries information about the refractive index of the medium neighboring the WG, and is detected by a low-cost CCD linear sensor and analyzed with a microcontroller or personal computer. The technique presents good sensitivity to relative humidity (RH) changes, especially below 10% RH, linear behavior between 20% and 80% RH, and a response time of a few seconds.

© 2013 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(310.2785) Thin films : Guided wave applications

ToC Category:
Thin Films

History
Original Manuscript: February 22, 2013
Revised Manuscript: April 25, 2013
Manuscript Accepted: May 20, 2013
Published: June 18, 2013

Citation
R. A. S. Ribeiro, J. F. M. Domenegueti, and S. C. Zilio, "High-sensitivity optical humidity sensor based on a thin dielectric waveguide," Appl. Opt. 52, 4287-4293 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-18-4287


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