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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 26127–26134

Fiber-optic bend sensor using LP21 mode operation

Yuqiang Fan, George Wu, Wanting Wei, Yufeng Yuan, Feng Lin, and X. Wu  »View Author Affiliations


Optics Express, Vol. 20, Issue 24, pp. 26127-26134 (2012)
http://dx.doi.org/10.1364/OE.20.026127


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Abstract

A novel fiber-optic bending sensor based upon the propagation of LP21 mode is demonstrated. The sensor, comprised of an S-bend fiber on an elastic film, measures LP21 mode specklegram rotation, which increments linearly with bending angle by the stress-optic effect. The sensor is capable of experimentally achieving a sensitivity as high as 4.13 rad/m−1. The theoretical analysis of the sensor, which is a combination of fiber coupled-mode theory and elastic-optic theory, validates the accuracy of the sensor. The sensor is also shown to be temperature-immune, and can detect both bending direction and bending angle with a large dynamic range. Furthermore, the sensor implementation incorporates inexpensive single-mode fiber at 650 nm for few-mode operation, enabling low-loss transmission and compatibility with existing interfaces.

© 2012 OSA

OCIS Codes
(060.2350) Fiber optics and optical communications : Fiber optics imaging
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(110.6150) Imaging systems : Speckle imaging

ToC Category:
Sensors

History
Original Manuscript: September 20, 2012
Revised Manuscript: October 24, 2012
Manuscript Accepted: October 24, 2012
Published: November 5, 2012

Citation
Yuqiang Fan, George Wu, Wanting Wei, Yufeng Yuan, Feng Lin, and X. Wu, "Fiber-optic bend sensor using LP21 mode operation," Opt. Express 20, 26127-26134 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26127


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