High-sensitivity cryogenic temperature sensors using pressurized fiber Bragg gratings

Meng-Chou Wu; Stanton L. DeHaven

doi:10.1117/12.673851

22 April 2006 High-sensitivity cryogenic temperature sensors using pressurized fiber Bragg gratings

Meng-Chou Wu, Stanton L. DeHaven

Proceedings Volume 6189, Optical Sensing II; 61890O (2006) https://doi.org/10.1117/12.673851
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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.

Citation Download Citation

Meng-Chou Wu and Stanton L. DeHaven "High-sensitivity cryogenic temperature sensors using pressurized fiber Bragg gratings", Proc. SPIE 6189, Optical Sensing II, 61890O (22 April 2006); https://doi.org/10.1117/12.673851

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