Open AccessUltrasensitive temperature sensor with Vernier-effect improved fiber Michelson interferometer
Author(s) -
Yuanfang Zhao,
Maolin Dai,
Zhenmin Chen,
Xuanyi Liu,
M. S. Aruna Gandhi,
Qian Li,
H. Y. Fu
Publication year - 2021
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.415857
Subject(s) - optics , interferometry , materials science , free spectral range , fiber optic sensor , astronomical interferometer , sensitivity (control systems) , michelson interferometer , temperature measurement , optical fiber , physics , laser , electronic engineering , quantum mechanics , engineering
A novel fiber Michelson interferometer (FMI) based on parallel dual polarization maintaining fiber Sagnac interferometers (PMF-SIs) is proposed and experimentally demonstrated for temperature sensing. The free spectral range (FSR) difference of dual PMF-SIs determines the FSR of envelope and sensitivity of the sensor. The temperature sensitivity of parallel dual PMF-SIs is greatly enhanced by the Vernier effect. Experimental results show that the temperature sensitivity of the proposed sensor is improved from -1.646 nm/°C (single PMF-SI) to 78.984 nm/°C (parallel dual PMF-SIs), with a magnification factor of 47.99, and the temperature resolution is improved from ±0.03037°C to ±0.00063°C by optimizing the FSR difference between the two PMF-SIs. Our proposed ultrasensitive temperature sensor is with easy fabrication, low cost and simple configuration which can be implemented for various real applications that need high precision temperature measurement.