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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.; Ramalingam, R.

Abstract:
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 ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/110104639
Veröffentlicht am 07.11.2018
Originalveröffentlichung
DOI: 10.1088/1757-899X/101/1/012154
Scopus
Zitationen: 8
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1757-8981, 1757-899X
urn:nbn:de:swb:90-AAA1101046395
KITopen-ID: 110104639
HGF-Programm 37.06.02 (POF III, LK 01)
Erschienen in IOP conference series / Materials science and engineering
Band 101
Heft 1
Seiten 012154/1-8
Nachgewiesen in Scopus
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