Open AccessUltra-compact silicon-microcap based improved Michelson interferometer high-temperature sensor
Author(s) -
Yafei Han,
Bo Liu,
Yongfeng Wu,
Yaya Mao,
Jing Wu,
Lilong Zhao,
Tong Nan,
Jin Wang,
Rong Tang,
Yulan Zhang,
Yan Liu
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.419260
Subject(s) - materials science , fusion splicing , interferometry , optics , optical fiber , astronomical interferometer , fiber optic sensor , michelson interferometer , silicon , extinction ratio , linearity , optoelectronics , wavelength , electronic engineering , physics , engineering
An ultra-short high-temperature fiber-optic sensor based on a silicon-microcap created by a single-mode fiber (SMF) and simple fusion splicing technology is proposed and experimentally demonstrated. A section of the SMF with a silicon-microcap at one end is connected to the "peanut" structure to build the microcap-based optical fiber improved Michelson interferometer (MI). The optimal discharge parameters of microcap and length of SMF has been investigated to achieve the best extinction ratio of 6.61 dB. The size of this microcap-based improved MI sensor is 560 µm and about 18 times shorter compared to the current fiber tip interferometers (about 10 mm). Meanwhile, it showed good robustness during the two heating-cooling cycles and the duration period stability test at 900 °C. This microcap-based improved MI sensor with the smaller size, simple fabrication, low cost, high reliability, and good linearity within a large dynamic range is beneficial to practical temperature measurement and massive production.