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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 8 — Mar. 10, 2014
  • pp: 1591–1596

Humidity and pressure sensor based on internal reflection

J. F. M. Domenegueti and S. C. Zilio  »View Author Affiliations

Applied Optics, Vol. 53, Issue 8, pp. 1591-1596 (2014)

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A low-cost humidity and pressure optical sensor, based on the internal reflection phenomenon, is presented. It takes advantage of the phase difference acquired by s- and p-polarized light undergoing internal reflection to generate an easily detectable minimum in the reflected profile, in a position corresponding to the critical angle. The apparatus presents good sensitivity to relative humidity changes above 70% and a response time below one second. The same device is also capable of measuring changes in pressure and can be used as a vacuum gauge between 1 and 1000 mbar.

© 2014 Optical Society of America

OCIS Codes
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(120.5475) Instrumentation, measurement, and metrology : Pressure measurement

ToC Category:
Remote Sensing and Sensors

Original Manuscript: October 22, 2013
Manuscript Accepted: January 27, 2014
Published: March 5, 2014

J. F. M. Domenegueti and S. C. Zilio, "Humidity and pressure sensor based on internal reflection," Appl. Opt. 53, 1591-1596 (2014)

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