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Proceedings Paper

High-sensitivity cryogenic temperature sensors using pressurized fiber Bragg gratings
Author(s): Meng-Chou Wu; Stanton L. DeHaven
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Paper Abstract

Cryogenic temperature sensing was studied using a pressurized fiber Bragg grating (PFBG). The PFBG was obtained by simply applying a small diametric load to a regular fiber Bragg grating (FBG), which was coated with polyimide of a thickness of 11 micrometers. The Bragg wavelength of the PFBG was measured at temperatures from 295 K to 4.2 K. A pressure-induced transition occurred at 200 K during the cooling cycle. As a result, the temperature sensitivity of the PFBG was found to be nonlinear and reach 24 pm/K below 200 K, more than three times the regular FBG. For the temperature change from 80 K to 10 K, the PFBG has a total Bragg wavelength shift of about 470 pm, 10 times more than the regular FBG. From room temperature to liquid helium temperature the PFBG gives a total wavelength shift of 3.78 nm, compared to the FBG of 1.51 nm. The effect of the coating thickness on the temperature sensitivity of the gratings is also discussed.

Paper Details

Date Published: 22 April 2006
PDF: 7 pages
Proc. SPIE 6189, Optical Sensing II, 61890O (22 April 2006); doi: 10.1117/12.673851
Show Author Affiliations
Meng-Chou Wu, NASA Langley Research Ctr. (United States)
Stanton L. DeHaven, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 6189:
Optical Sensing II
Brian Culshaw; Anna G. Mignani; Hartmut Bartelt; Leszek R. Jaroszewicz, Editor(s)

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