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High-sensitivity Cryogenic Temperature Sensors using Pressurized Fiber Bragg GratingsCryogenic 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 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 but 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.
Document ID
20080013572
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Wu, Meng-Chou
(NASA Langley Research Center Hampton, VA, United States)
DeHaven, Stanton L.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2006
Subject Category
Optics
Meeting Information
Meeting: Photonics Europe 2006
Location: Strasbourg
Country: France
Start Date: April 3, 2006
End Date: April 7, 2006
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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