Open AccessHigh resolution, all-fiber, micro-machined sensor for simultaneous measurement of refractive index and temperature
Author(s) -
Simon Pevec,
Denis Đonlagić
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.016241
Subject(s) - materials science , refractive index , optics , optical fiber , fiber optic sensor , etching (microfabrication) , surface micromachining , temperature measurement , resolution (logic) , fiber , optoelectronics , fabrication , composite material , medicine , physics , alternative medicine , layer (electronics) , pathology , quantum mechanics , artificial intelligence , computer science
This paper presents a highly-sensitive, miniature, all-silica, dual parameter fiber-optic Fabry-Perot sensor, which is suitable for independent measurement of the refractive index and the temperature of the fluid surrounding the sensor. The experimental sensor was produced by a micromachining process based on the selective etching of doped silica glass and a simple assembly procedure that included fiber cleaving, splicing and etching of optical fibers. The presented sensor also allows for direct compensation of the temperature's effect on the fluid's refractive index change and consequently provides opportunities for the detection of very small changes in the surrounding fluid's composition. A measurement resolution of 2x10(-7) RIU was demonstrated experimentally for a component of the refractive index that is related purely to the fluid's composition. This resolution was achieved under non-stabilized temperature conditions. The temperature resolution of the sensor proved to be about 10(-3) °C. These high resolution measurements were obtained by phase-tracking of characteristic components in a Fourier transform of sensor's optical spectrum.