title: Miniature fiber-optic high temperature sensor based on a hybrid structured Fabry-Perot interferometer.
abstract: A miniature Fabry-Perot (FP) interferometric fiber-optic sensor suitable for high-temperature sensing is proposed and demonstrated. The sensor head consists of two FP cavities formed by fusion splicing a short hollow-core fiber and a piece of single-mode fiber at a photonic crystal fiber in series. The reflection spectra of an implemented sensor are measured at several temperatures and analyzed in the spatial frequency domain. The experiment shows that the thermal-optic effect of the cavity material is much more appreciable than its thermal expansion. The temperature measurements up to 1000 degrees C with a step of 50 degrees C confirm that it could be applicable as a high-temperature sensor.
authors.affiliation: Department of Information and Communications, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, South Korea.
authors.forename: Hae Young
authors.initials: HY
authors.lastname: Choi
authors.forename: Kwan Seob
authors.initials: KS
authors.lastname: Park
authors.forename: Seong Jun
authors.initials: SJ
authors.lastname: Park
authors.forename: Un-Chul
authors.initials: UC
authors.lastname: Paek
authors.forename: Byeong Ha
authors.initials: BH
authors.lastname: Lee
authors.forename: Eun Seo
authors.initials: ES
authors.lastname: Choi