Title :
Fiber Bragg Grating With Micro-Holes for Simultaneous and Independent Refractive Index and Temperature Sensing
Author :
Minwei Yang ; Wang, D.N. ; Liao, C.R.
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech. Univ., Kowloon, China
Abstract :
A compact optical fiber sensor based on a fiber Bragg grating with multiple micro-holes is effectively used for simultaneous and independent refractive index and temperature sensing. The micro-holes are drilled by use of femtosecond laser micromachining. The measurement is implemented by simple detection of the grating resonant wavelength shift and its intensity variation, respectively. The refractive index sensitivity of ~29.50 dB/RIU (refractive index unit) is obtained in the refractive index range between 1.30 and 1.45, with a good linearity. The system operation is simple, convenient and reliable.
Keywords :
Bragg gratings; fibre optic sensors; high-speed optical techniques; laser beam machining; micromachining; refractive index measurement; temperature measurement; temperature sensors; femtosecond laser micromachining; fiber Bragg grating; grating resonant wavelength shift; microholes; optical fiber sensor; refractive index sensitivity; refractive index unit; temperature sensing; Fiber gratings; Optical fiber sensors; Temperature measurement; Temperature sensors; Fiber Bragg gratings; laser ablation; optical fiber sensors; ultrafast optics;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2163624
