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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 2 — Jan. 10, 2011
  • pp: 231–236

Fiber-optic temperature sensor based on interaction of temperature-dependent refractive index and absorption of germanium film

Min Li and Yulin Li  »View Author Affiliations

Applied Optics, Vol. 50, Issue 2, pp. 231-236 (2011)

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The interaction of a large temperature-dependent refractive index and a temperature-dependent absorption of semiconductor materials at 1550 nm can be used to build a very sensitive, film coated fiber-optic temperature probe. We developed a sensor model for the optical fiber-germanium film sensor. A temperature sensitivity of reflectivity change of 0.0012 / ° C , corresponding to 0.1 ° C considering a moderate signal processing system, over 100 ° C within the temperature regime of 20 ° C to 120 ° C , has been demonstrated by experimental tests of the novel sensor. The potential sensitivity and further applications of the sensor are discussed.

© 2011 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: September 8, 2010
Revised Manuscript: November 23, 2010
Manuscript Accepted: November 25, 2010
Published: January 7, 2011

Min Li and Yulin Li, "Fiber-optic temperature sensor based on interaction of temperature-dependent refractive index and absorption of germanium film," Appl. Opt. 50, 231-236 (2011)

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