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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 30 — Oct. 20, 2006
  • pp: 7767–7771

Liquid-level sensor with a high-birefringence-fiber loop mirror

Dong Bo, Zhao Qida, Lvjun Feng, Guo Tuan, Xue Lifang, Li Shuhong, and Gu Hong  »View Author Affiliations

Applied Optics, Vol. 45, Issue 30, pp. 7767-7771 (2006)

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A novel liquid-level sensor with a high-birefringence-fiber loop mirror (HBFLM) based on a uniform-strength cantilever beam (UCB) is proposed and demonstrated. Part of the high-birefringence fiber is pasted onto the central surface of the UCB. A hollow suspending pole is utilized to apply force at the end of the beam. The applied force varies with the change of the liquid level, leading to a change of transmission intensity. Thus the variation of liquid level can be determined via the laser wavelength within the quasi-linear transmission range of the HBFLM filter. Its sensitivity, resolution, and linear measurement range reach 0.047 / cm , 10   mm , and 140   mm , respectively. The advantages of the sensor include simple structure, high sensitivity, low cost, and good repeatability, etc. The sensing signal can be directly detected by a photodetector and does not require complicated demodulation devices.

© 2006 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 21, 2006
Revised Manuscript: June 12, 2006
Manuscript Accepted: June 23, 2006

Dong Bo, Zhao Qida, Lvjun Feng, Guo Tuan, Xue Lifang, Li Shuhong, and Gu Hong, "Liquid-level sensor with a high-birefringence-fiber loop mirror," Appl. Opt. 45, 7767-7771 (2006)

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