Open AccessHigh temperature probe sensor with high sensitivity based on Michelson interferometer
Author(s) -
Sigang Yang,
Qiangzhou Rong,
Hao Sun,
Jing Zhang,
Liang Lei,
Qin Xu,
Zhan Su-Chang,
Yu Du,
Dingyi Feng,
Xueguang Qiao,
Manli Hu
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.084218
Subject(s) - cladding (metalworking) , materials science , multi mode optical fiber , optics , fiber optic sensor , interferometry , cladding mode , single mode optical fiber , optical fiber , optoelectronics , polarization maintaining optical fiber , physics , composite material
We propose a high sensitivity fiber optical temperature sensor with simple structure. The sensor is composed of a multimode fiber (MMF) and a short single mode fiber (SMF) whose end is coated with silver film as a reflective mirror. Due to the mismatch between the MMF core and the SMF core, part of guided mode is coupled with the cladding modes of downstream SMF cladding. The mode index difference between the fiber core and cladding is attributed to the phase difference, resulting in interference. When ambient temperature increases, the interference spectrum presents red-drift because of the difference in thermo-dependence. A high temperature sensitivity of 120 pm/℃ is achieved, and the linearity is 99.5%. The configuration is simple and has a compact size, making it a good candidate for distant temperature sensing and oil prospecting.