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Applied Optics

Applied Optics


  • Vol. 35, Iss. 7 — Mar. 1, 1996
  • pp: 1135–1142

Phase-based Bragg intragrating distributed strain sensor

S. Huang, M. M. Ohn, and R. M. Measures  »View Author Affiliations

Applied Optics, Vol. 35, Issue 7, pp. 1135-1142 (1996)

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A strain-distribution sensing technique based on the measurement of the phase spectrum of the reflected light from a fiber-optic Bragg grating is described. When a grating is subject to a strain gradient, the grating will experience a chirp and therefore the resonant wavelength will vary along the grating, causing wavelength-dependent penetration depth. Because the group delay for each wavelength component is related to its penetration depth and the resonant wavelength is determined by strain, a measured phase spectrum can then indicate the local strain as a function of location within the grating. This phase-based Bragg grating sensing technique offers a powerful new means for studying some important effects over a few millimeters or centimeters in smart structures.

© 1996 Optical Society of America

Original Manuscript: August 10, 1995
Revised Manuscript: October 24, 1995
Published: March 1, 1996

S. Huang, M. M. Ohn, and R. M. Measures, "Phase-based Bragg intragrating distributed strain sensor," Appl. Opt. 35, 1135-1142 (1996)

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