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A study on intermediate buffer layer of a coated Fiber Bragg grating cryogenic temperature sensors

Freitas, R.; Araujo, F.; Araujo, J.; Neumann, H. 1; Ramalingam, R. 1
1 Universität Karlsruhe (TH) – Campus Nord (CN)


The sensor characteristics of a coated Fiber Bragg grating (FBG) thermal sensor for cryogenic temperatures depends mainly on the coating materials. The sensitivity of the coated FBG can be improved by enhancing the effective thermal strain transfer between the different layers and the bare FBG. The dual coated FBG’s has a primary layer and the secondary layer. The primary coating acts as an intermediate buffer between the secondary coating and the bare FBG. The outer secondary coating is normally made of metals with high thermal expansion coefficient. In this work, a detailed study is carried out on chromium and titanium intermediate buffer layers with various coating thicknesses and combinations. To improve the sensitivity, the secondary coating layer was tested with Indium, Lead and Tin. The sensors were then calibrated in a cryogenic temperature calibration facility at Institute of Technical Physics (ITEP), Karlsruhe Institute of Technology. The sensors were subjected to several thermal cycles between 4.2 and 80 K to study the sensor performance and its thermal characteristics. The sensor exhibits a Bragg wavelength shift of 13pm at 20K. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/110104639
Veröffentlicht am 07.11.2018
DOI: 10.1088/1757-899X/101/1/012154
Zitationen: 13
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1757-8981, 1757-899X
KITopen-ID: 110104639
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Erschienen in IOP conference series / Materials science and engineering
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 101
Heft 1
Seiten 012154/1-8
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