title: Use of dual-grating sensors formed by different types of fiber Bragg gratings for simultaneous temperature and strain measurements.
abstract: We report on a systematic investigation of the dependence of both temperature and strain sensitivities on the fiber Bragg grating type, including the well-known Type I, Type IIA, and a new type that we have designated Type IA, using both hydrogen-free and hydrogenated B/Ge codoped fibres. We have identified distinct sensitivity characteristics for each grating type, and we have used them to implement a novel dual-grating, dual-parameter sensor device. Three dual-grating sensing schemes with different combinations of grating type have been constructed and compared, and that of a Type IA-Type IIA combination exhibits the best performance, which is also 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.
authors.affiliation: Photonics Research Group, Aston University, Birmingham, B4 7ET, United Kingdom. x.shu@aston.ac.uk
authors.forename: Xuewen
authors.initials: X
authors.lastname: Shu
authors.forename: Donghui
authors.initials: D
authors.lastname: Zhao
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Ian
authors.initials: I
authors.lastname: Bennion