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Coupled-fiber Bragg grating sensor structure for cryogenic conditions
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Paper Abstract

We propose a fiber-optic sensor structure for simultaneous strain and temperature monitoring in cryogenic conditions. The polymer coated fiber Bragg grating sensor makes it a suitable candidate for cryogenic temperature measurement. FBG have been shown to have an enhanced sensitivity of 48 pm °C-1 from -185 to 25 °C. The cross-sensitivity problem has been solved by introducing a glass capillary tube to encapsulate the coated FBG. The thermal expansion of capillary material was compensated by cleaving the one end of FBG free and the other end with the temperature resistant epoxy resins. Experiments results validate the proposed method can successfully monitor the strain and temperatures at cryogenic temperatures.

Paper Details

Date Published: 6 September 2017
PDF: 6 pages
Proc. SPIE 10374, Optical Modeling and Performance Predictions IX, 1037408 (6 September 2017); doi: 10.1117/12.2274602
Show Author Affiliations
Umesh Sampath, Chonbuk National Univ. (Korea, Republic of)
Daegil Kim, Chonbuk National Univ. (Korea, Republic of)
Minho Song, Chonbuk National Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 10374:
Optical Modeling and Performance Predictions IX
Mark A. Kahan; Marie B. Levine-West, Editor(s)

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