title: ZrO2 thin-film-based sapphire fiber temperature sensor.
abstract: A submicrometer-thick zirconium dioxide film was deposited on the tip of a polished C-plane sapphire fiber to fabricate a temperature sensor that can work to an extended temperature range. Zirconium dioxide was selected as the thin film material to fabricate the temperature sensor because it has relatively close thermal expansion to that of sapphire, but more importantly it does not react appreciably with sapphire up to 1800 °C. In order to study the properties of the deposited thin film, ZrO2 was also deposited on C-plane sapphire substrates and characterized by x-ray diffraction for phase analysis as well as by atomic force microscopy for analysis of surface morphology. Using low-coherence optical interferometry, the fabricated thin-film-based sapphire fiber sensor was tested in the lab up to 1200 °C and calibrated from 200° to 1000 °C. The temperature resolution is determined to be 5.8 °C when using an Ocean Optics USB4000 spectrometer to detect the reflection spectra from the ZrO2 thin-film temperature sensor.
authors.affiliation: Center for Photonics Technology, The Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute & State University, Blacksburg, Virginia 24061, USA. wangjj@vt.edu
authors.forename: Jiajun
authors.initials: J
authors.lastname: Wang
authors.forename: Evan M
authors.initials: EM
authors.lastname: Lally
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Wang
authors.forename: Jianmin
authors.initials: J
authors.lastname: Gong
authors.forename: Gary
authors.initials: G
authors.lastname: Pickrell
authors.forename: Anbo
authors.initials: A
authors.lastname: Wang