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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 10 — May. 19, 2014
  • pp: 11892–11899

Dielectric multilayer-based fiber optic sensor enabling simultaneous measurement of humidity and temperature

Minghong Yang, Weijing Xie, Yutang Dai, Dongwen Lee, Jixiang Dai, Yi Zhang, and Zhi Zhuang  »View Author Affiliations

Optics Express, Vol. 22, Issue 10, pp. 11892-11899 (2014)

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A multilayer-based fiber optic sensor enabling simultaneous measurement of humidity and temperature is proposed and demonstrated. The sensitive elements were multilayer coatings consisting of nano-porous TiO2 and SiO2 films, which were deposited on fiber end-face to form a Fabry-Perot (F-P) filter structure. Relative-humidity (RH) sensing is correlated with the shift of interference fringe due to the change of effective refractive index of porous coatings when exposed to different RH environments. The sensor is sealed in a glass tube in case of temperature measurement. Experimental results show that the average sensitivity are 0.43nm/%RH and 0.63nm/°C respectively when environmental RH changes from 1.8%RH to 74.7%RH and temperature changes from 21.4°C to 38.8°C. The proposed sensors present high repeatability, and especially highly sensitive to lower moisture measure.

© 2014 Optical Society of America

OCIS Codes
(310.1620) Thin films : Interference coatings
(310.1860) Thin films : Deposition and fabrication
(310.4165) Thin films : Multilayer design
(310.6845) Thin films : Thin film devices and applications

ToC Category:

Original Manuscript: March 24, 2014
Revised Manuscript: April 28, 2014
Manuscript Accepted: April 29, 2014
Published: May 8, 2014

Minghong Yang, Weijing Xie, Yutang Dai, Dongwen Lee, Jixiang Dai, Yi Zhang, and Zhi Zhuang, "Dielectric multilayer-based fiber optic sensor enabling simultaneous measurement of humidity and temperature," Opt. Express 22, 11892-11899 (2014)

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