Instrumentation, Techniques, and Measurement

Fiber Bragg gratings as transient thermal gradient sensors

[+] Author Affiliations
Drew A. Hackney, Kara J. Peters

North Carolina State University, Department of Mechanical and Aerospace Engineering, Campus Box 7910, Raleigh, North Carolina 27695, United States

Richard J. Black, Joannes M. Costa, Behzad Moslehi

Intelligent Fiber Optic Systems Corporation, 2363 Calle Del Mundo, Santa Clara, California 95054, United States

Opt. Eng. 55(11), 114102 (Nov 16, 2016). doi:10.1117/1.OE.55.11.114102
History: Received April 13, 2016; Accepted October 18, 2016
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Abstract.  We experimentally subject a fiber Bragg grating to an unknown, variable temperature gradient. We use the full-spectral response of the grating to determine the magnitude of the gradient over the length of the grating via the full width at quarter maximum bandwidth. The experimental bandwidth and spectrum deformation were compared with a numerical model consisting of an analytical heat transfer model, a finite element analysis model, and the transfer matrix (T-matrix) method. The numerical model showed excellent agreement with the experimental results when the T-matrix method was modified to include the slope of the gradient in addition to the magnitude of the gradient.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Drew A. Hackney ; Kara J. Peters ; Richard J. Black ; Joannes M. Costa and Behzad Moslehi
"Fiber Bragg gratings as transient thermal gradient sensors", Opt. Eng. 55(11), 114102 (Nov 16, 2016). ; http://dx.doi.org/10.1117/1.OE.55.11.114102


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