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Optical fiber temperature sensor based on modal interference in multimode fiber lengthened by a short segment of polydimethylsiloxane
Author(s) -
Cai Lu,
Liu Yin,
Hu Sheng,
Liu Qiang
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31843
Subject(s) - materials science , polydimethylsiloxane , multi mode optical fiber , graded index fiber , fiber , optical fiber , core (optical fiber) , refractive index , sensitivity (control systems) , optics , single mode optical fiber , fiber optic sensor , photonic crystal fiber , temperature coefficient , thermal expansion , polarization maintaining optical fiber , optical path length , optoelectronics , composite material , electronic engineering , physics , engineering
A fiber optics structure for temperature measurement is presented and demonstrated. This structure is composed of segments of single mode fiber (SMF), no‐core fiber (NCF), hollow core fiber (HCF), and cured polydimethylsiloxane (PDMS) which is inserted into the cavity of HCF. Owning to the high thermal expansion coefficient (TEC) and thermo‐optic coefficient (TOC) of PDMS, the optical path length and the effective refractive index (RI) all register much larger change, leading to the higher temperature sensitivity of the sensor. Simulation showed similar result with experiment. The temperature sensitivity of 580.6 pm/°C is achieved in the range of 28°C to 50°C.