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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 32 — Nov. 10, 2009
  • pp: 6082–6087

Sensitivity enhancement of fiber loop cavity ring-down pressure sensor

Yajun Jiang, Dexing Yang, Daqing Tang, and Jianlin Zhao  »View Author Affiliations

Applied Optics, Vol. 48, Issue 32, pp. 6082-6087 (2009)

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We present a theoretical and experimental study on sensitivity enhancement of a fiber-loop cavity ring-down pressure sensor. The cladding of the sensing fiber is etched in hydrofluoric acid solution to enhance its sensitivity. The experimental results demonstrate that the pressure applied on the sensing fiber is linearly proportional to the difference between the reciprocals of the ring-down time with and without pressure, and the relative sensitivity exponentially increases with decreasing the cladding diameter. When the sensing fiber is etched to 41.15 μm , its sensitivity is about 36 times that of nonetched fiber in the range of 0 to 32.5 MPa . The measured relative standard deviation of the ring-down time is about 0.15% and, correspondingly, the least detectable loss is about 0.00069 dB .

© 2009 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(230.5750) Optical devices : Resonators
(300.6260) Spectroscopy : Spectroscopy, diode lasers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 17, 2009
Revised Manuscript: May 6, 2009
Manuscript Accepted: October 2, 2009
Published: November 2, 2009

Yajun Jiang, Dexing Yang, Daqing Tang, and Jianlin Zhao, "Sensitivity enhancement of fiber loop cavity ring-down pressure sensor," Appl. Opt. 48, 6082-6087 (2009)

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