title: Ultrafast femtosecond-laser-induced fiber Bragg gratings in air-hole microstructured fibers for high-temperature pressure sensing.
abstract: We present fiber Bragg grating pressure sensors in air-hole microstructured fibers for high-temperature operation above 800 degrees C. An ultrafast laser was used to inscribe Type II grating in two-hole optical fibers. The fiber Bragg grating resonance wavelength shift and peak splits were studied as a function of external hydrostatic pressure from 15 psi to 2000 psi. The grating pressure sensor shows stable and reproducible operation above 800 degrees C. We demonstrate a multiplexible pressure sensor technology for a high-temperature environment using a single fiber and a single-fiber feedthrough.
authors.affiliation: Department of Electrical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.
authors.forename: Charles M
authors.initials: CM
authors.lastname: Jewart
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Wang
authors.forename: John
authors.initials: J
authors.lastname: Canning
authors.forename: Dan
authors.initials: D
authors.lastname: Grobnic
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Mihailov
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Chen