Open AccessMiniature temperature sensor with germania-core optical fiber
Author(s) -
Jingyi Yang,
Yangzi Zheng,
Li Han Chen,
Chi Chiu Chan,
Xinyong Dong,
Perry Ping Shum,
Haibin Su
Publication year - 2015
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.23.017687
Subject(s) - materials science , optics , fiber optic sensor , graded index fiber , fusion splicing , optical fiber , cladding (metalworking) , polarization maintaining optical fiber , core (optical fiber) , temperature measurement , refractive index , photonic crystal fiber , interferometry , hard clad silica optical fiber , plastic clad silica fiber , fiber , plastic optical fiber , optoelectronics , physics , quantum mechanics , metallurgy , composite material
A miniature all-fiber temperature sensor is demonstrated by using a Michelson interferometer formed with a short length of Germania-core, silica-cladding optical fiber (Ge-fiber) fusion-spliced to a conventional single-mode fiber (SMF). Thanks to the large differential refractive index of the Ge-fiber sensing element, a reasonably small free spectral range (FSR) of 18.6 nm is achieved even with an as short as 0.9 mm Ge-fiber that may help us increase the measurement accuracy especially in point sensing applications and, at the same time, keep large measurement temperature range without overlapping reading problem. Experimental results show that high sensitivity of 89.0 pm/°C is achieved and the highest measurement temperature is up to 500°C.