Title :
Fiber Bragg grating cavity sensor for simultaneous measurement of strain and temperature
Author :
Wei-Chong Du ; Xiao-Ming Tao ; Hwa-Yaw Tam
Author_Institution :
South China Normal Univ., China
Abstract :
A novel and short (5 mm long) fiber grating based sensor with a fiber grating Fabry-Perot cavity (GFPC) structure was fabricated and tested for simultaneous measurement of strain and temperature. The sensor exhibits unique properties that it possesses two spectral peaks within its main reflection band and the normalized peak power difference, in addition to its peak wavelength shift, changes linearly with strain or temperature. The accuracy of this particular sensor in measuring strain and temperature are estimated to be /spl plusmn/30 μs in a range from 0 to 3000 μs and /spl plusmn/0.4/spl deg/C from 20/spl deg/C to 60/spl deg/C, respectively.
Keywords :
Bragg gratings; Fabry-Perot resonators; fibre optic sensors; measurement uncertainty; strain measurement; strain sensors; temperature measurement; 20 to 60 C; 5 mm; fiber Bragg grating cavity sensor; fiber grating Fabry-Perot cavity structure; main reflection band; normalized peak power difference; peak wavelength shift; simultaneous measurement; spectral peaks; strain measurement; strain sensors; temperature measurement; Capacitive sensors; Fabry-Perot; Fiber gratings; Optical fiber sensors; Optical fiber testing; Particle measurements; Reflection; Strain measurement; Temperature sensors; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
