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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 18 — Jun. 20, 2007
  • pp: 3682–3687

Extrinsic Fabry–Perot cavity optical fiber liquid-level sensor

Tao Lü and Suping Yang  »View Author Affiliations

Applied Optics, Vol. 46, Issue 18, pp. 3682-3687 (2007)

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An optical fiber liquid-level sensor based on an extrinsic Fabry–Perot (FP) cavity is proposed and demonstrated. The FP cavity consists of the end of the single-mode optical fiber and the elastic silicon layer. Liquid pressures act on the mechanical construction to change the cavity length, resulting in differential phase shifts that may be observed as variations of the output signal intensity. Self-compensated steps have been taken to obtain high accuracy and long-term stability in realistic circumstances. Experimental results indicate that accuracy of 2   mm over a full scale of 3.5   m (water) is obtained under ambient temperature 10 38 ° C . The sensor can be used to measure liquid levels continuously and accurately in explosive and flammable environments.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(280.3420) Remote sensing and sensors : Laser sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 17, 2006
Manuscript Accepted: February 16, 2007
Published: May 31, 2007

Tao Lü and Suping Yang, "Extrinsic Fabry-Perot cavity optical fiber liquid-level sensor," Appl. Opt. 46, 3682-3687 (2007)

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