Effectively simultaneous temperature and strain measurement utilising a dual-grating sensor formed by type IA and type IIA FBGs

Author

Shu, X. ; Zhao, D. ; Liu, Y. ; Gwandu, B. ; Floreani, F. ; Zhang, L. ; Bennion, I.

Author_Institution

Dept. of Electron. Eng., Aston Univ., Birmingham, UK

Volume

2

fYear

2002

fDate

2002

Firstpage

1740

Abstract

In this paper, we report a systematic investigation of the dependence of both temperature and strain sensitivities on the fiber Bragg grating (FBG) type, including the well-known Type I, Type IIA, and a now type which we have designated Type IA, using both hydrogen-free and hydrogenated B/Ge codoped fibers. We have identified distinct sensitivity characteristics for each grating type, and we have utilised them to implement a novel dual-grating, dual-parameter sensor device. Three dual-grating sensing schemes with different combinations of grating types have been constructed and compared. The Type IA-Type IIA combination exhibits the best performance and is superior to that of previously reported grating-based structures. The characteristics of the measurement errors in such dual-grating sensor systems is also presented in detail.

Keywords

Bragg gratings; fibre optic sensors; measurement errors; sensitivity analysis; strain measurement; temperature measurement; B/Ge codoped fibers; Type I FBGs; Type IA FBGs; Type IIA FBGs; dual-grating sensor; dual-parameter sensor device; fiber Bragg grating; fiber optical sensor; measurement errors; sensitivity characteristics; simultaneous temperature/strain measurement; strain sensitivity; temperature sensitivity; Bragg gratings; Capacitive sensors; Fiber gratings; Optical fiber devices; Optical fiber sensors; Sensor phenomena and characterization; Strain measurement; Temperature dependence; Temperature measurement; Temperature sensors;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors, 2002. Proceedings of IEEE

Print_ISBN

0-7803-7454-1

Type

conf

DOI

10.1109/ICSENS.2002.1037387

Filename

1037387