Title :
Optically Heated Long-Period Grating as Temperature-Insensitive Fiber-Optic Refractive-Index Sensor
Author :
Yebin Zhang ; Shaorui Gao ; Zhang, A. Ping
Author_Institution :
State Key Lab. of Modern Opt. Instrum., Zhejiang Univ., Hangzhou, China
Abstract :
A temperature-insensitive fiber-optic refractive-index sensor based on optically heated long-period grating (LPG) is presented. The LPG is manufactured in a short section of cobalt-doped optical fiber (COF), which can be thermally stabilized through a pump light. Two fiber Bragg gratings (FBGs) are manufactured in COF and single-mode fiber (SMF), respectively, to monitor the local sensor and surrounding medium temperature. Experimental results demonstrate that this fiber-grating-based miniature refractive-index sensor can efficiently eliminate temperature cross-sensitivity in the temperature range of 5~60°C.
Keywords :
cobalt; diffraction gratings; fibre optic sensors; optical fibres; optical pumping; refractometers; thermal stability; thermo-optical devices; thermo-optical effects; COF; FBG; LPG; SMF; cobalt-doped optical fiber; fiber Bragg gratings; optically heated long-period grating; pump light; single-mode fiber; temperature cross-sensitivity; temperature-insensitive fiber-optic refractive-index sensor; thermal stability; Fiber gratings; Laser excitation; Optical fiber sensors; Refractive index; Temperature measurement; Temperature sensors; Optical heating; fiber-optic sensor; long-period grating (LPG); refractive-index sensor;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2012.2232907
