Radiation tolerant FBG thermo-hygrometers for relative humidity detection in the CMS experiment at CERN

Author

Berruti, G. ; Consales, M. ; Giordano, M. ; Buontempo, S. ; Breglio, G. ; Makovec, A. ; Petagna, P. ; Cusano, A.

Author_Institution

Dept. of Eng., Univ. of Sannio, Benevento, Italy

fYear

2014

fDate

7-9 May 2014

Firstpage

1

Lastpage

3

Abstract

This work investigates the performances and the radiation tolerance of optical thermo-hygrometers based on Fiber Bragg Gratings (FBG) technology for humidity monitoring in the Compact Muon Solenoid (CMS) experiment at CERN, in Geneva. Extensive characterizations in terms of sensitivity, repeatability and accuracy on 80 specially produced polyimide-coated FBG sensors and 80 commercial temperature FBG sensors are presented. Progressive irradiation campaigns with γ- ionizing radiations were also performed. Results showed that the sensors sensitivity is unchanged after each radiation exposure; while the wavelength peak exhibits a radiation-induced shift. The saturation properties of this shift are discussed.

Keywords

Bragg gratings; fibre optic sensors; humidity sensors; hygrometers; optical fibre cladding; γ- ionizing radiations; CERN; CMS experiment; Compact Muon Solenoid; FBG thermo-hygrometers; fiber Bragg Gratings; humidity monitoring; polyimide-coated FBG sensors; radiation exposure; radiation tolerance; radiation-induced shift; relative humidity detection; saturation properties; Fiber gratings; Humidity; Optical fiber sensors; Sensor phenomena and characterization; Temperature sensors; CERN; CMS; Fiber Bragg Grating; High Energy Physics; Relative Humidity;

fLanguage

English

Publisher

ieee

Conference_Titel

Photonics Conference, 2014 Third Mediterranean

Conference_Location

Trani

Type

conf

DOI

10.1109/MePhoCo.2014.6866457

Filename

6866457