Open AccessFiber Laser Temperature Sensor based on Sagnac Interferometer
Author(s) -
Mohd Azwadi Omar,
Noran Azizan Cholan,
Anas Malik Abdulrahman,
N A N Jaharuddin,
R. Talib,
Nor Hafizah Ngajikin
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1371/1/012016
Subject(s) - interferometry , materials science , optics , laser , fiber laser , fiber optic sensor , wavelength , polarization maintaining optical fiber , dispersion shifted fiber , optical fiber , optoelectronics , physics
A fiber laser temperature sensor which is based on Sagnac interferometer is proposed in this work. The fiber laser consists of an erbium-doped fiber amplifier for signal amplification and a Sagnac interferometer for signal filtering. The Sagnac interferometer is made of 30 cm polarization maintaining fiber (PMF) and it acts as the sensing head. Experimental results suggest that the temperature does affect the laser wavelength. As the temperature varies from 30°C to 41°C, the laser wavelength is shifted to the lower wavelength from 1596.5 nm to 1581.8 nm with the recorded sensitivity of 1.1965 nm/°C. The change of the laser wavelength with temperature validates the use of this fiber laser as the temperature sensor.