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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 9 — Mar. 20, 2012
  • pp: 1188–1197

Superstructured fiber-optic contact force sensor with minimal cosensitivity to temperature and axial strain

Christopher R. Dennison and Peter M. Wild  »View Author Affiliations


Applied Optics, Vol. 51, Issue 9, pp. 1188-1197 (2012)
http://dx.doi.org/10.1364/AO.51.001188


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Abstract

In this work a new superstructured, in-fiber Bragg grating (FBG)-based, contact force sensor is presented that is based on birefringent D-shape optical fiber. The sensor superstructure comprises a polyimide sheath, a stress-concentrating feature, and an alignment feature that repeatably orients the sensor with respect to contact forces. A combination of plane elasticity and strain-optic models is used to predict sensor performance in terms of sensitivity to contact force and axial strain. Model predictions are validated through experimental calibration and indicate contact force, axial strain, and temperature sensitivities of 169.6pm/(N/mm), 0.01pm/με, and 1.12pm/°C in terms of spectral separation. The sensor addresses challenges associated with contact force sensors that are based on FBGs in birefringent fiber, FBGs in conventional optical fiber, and tilted FBGs. Relative to other birefringent fiber sensors, the sensor has contact force sensitivity comparable to the highest sensitivity of commercially available birefringent fibers and, unlike other birefringent fiber sensors, is self-aligning with respect to contact forces. Unlike sensors based on Bragg gratings in conventional fiber and tilted Bragg gratings, the sensor has minimal cosensitivity to both axial strain and changes in temperature.

© 2012 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: September 7, 2011
Revised Manuscript: December 7, 2011
Manuscript Accepted: December 9, 2011
Published: March 12, 2012

Citation
Christopher R. Dennison and Peter M. Wild, "Superstructured fiber-optic contact force sensor with minimal cosensitivity to temperature and axial strain," Appl. Opt. 51, 1188-1197 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-9-1188


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