Open AccessTemperature-calibrated high-precision refractometer using a tilted fiber Bragg grating
Author(s) -
Biqiang Jiang,
Kaiming Zhou,
Changle Wang,
Yunhe Zhao,
Jianlin Zhao,
Lin Zhang
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.025910
Subject(s) - refractometer , vernier scale , optics , materials science , fiber bragg grating , refractive index , calibration , wavelength , grating , cladding (metalworking) , repeatability , optoelectronics , physics , chemistry , chromatography , quantum mechanics , metallurgy
We present a refractometer with main- and vernier-scale to measure the refractive index (RI) of liquids with high precision by using the fine spectrum structure of a tilted fiber Bragg grating (TFBG). The absolute RI values are determined by the accurate wavelength of cut-off mode resonances. The main- and vernier-scale are calibrated by measuring large groups of fine spectra at different cut-off mode resonances in a small RI range, and the use of vernier-scale certainly reduces the RI measurement uncertainty resulted from the discrete cladding mode resonances. The performance of the TFBG-based vernier refractometer is experimentally verified by exploring the temperature dependence of RI of anhydrous ethanol in a near infrared region, showing an enhanced accuracy to the order of 10 -4 , high repeatability and temperature self-calibration capability.