title: Simultaneous measurement of refractive index and temperature based on a reflection-mode long-period grating and an intrinsic Fabry-Perot interferometer sensor.
abstract: We have demonstrated a single fiber probe for simultaneous measurement of external refractive index and temperature based on two interferometers: a reflection-mode long-period grating (LPG) for refractometry and an intrinsic Fabry-Perot interferometer (IFPI) for temperature measurement. Since the output signal of the combined structure is a superposition of signals produced by both sensors, which have different spatial frequencies, the original signals needed for the index and temperature measurements can be separated and recovered through digital filters.
authors.affiliation: Center for Photonics Technology, Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061-0111, USA. dakim1@vt.edu
authors.forename: Dae Woong
authors.initials: DW
authors.lastname: Kim
authors.forename: Fabin
authors.initials: F
authors.lastname: Shen
authors.forename: Xiaopei
authors.initials: X
authors.lastname: Chen
authors.forename: Anbo
authors.initials: A
authors.lastname: Wang