Title :
Simultaneous Refractive Index and Temperature Measurement With LPFG and Liquid-Filled PCF
Author :
Guolu Yin ; Yiping Wang ; Changrui Liao ; Bing Sun ; Yingjie Liu ; Shen Liu ; Qiao Wang ; Kaiming Yang ; Jian Tang ; Xiaoyong Zhong
Author_Institution :
Key Lab. of Optoelectron. Devices & Syst., Shenzhen Univ., Shenzhen, China
Abstract :
We proposed and demonstrated a novel scheme for simultaneous measurement of temperature and refractive index (RI) by cascading a liquid-filled photonics crystal fiber (PCF) to a long period fiber grating (LPFG) written in a single-mode fiber. The liquid-filled PCF showed a high-temperature sensitivity of 1.695 nm/°C, which is two orders of magnitude higher than that of the LPFG (0.0642 nm/°C). The LPFG exhibited a blue shift with the increased RI. In contrast, liquid-filled PCF showed a total immunity to the surrounding RI. So, the temperature was solely measured by the liquid-filled PCF, and the RI information was extracted from the total response of the LPFG with the temperature effect having been compensated by the liquid-filled PCF.
Keywords :
diffraction gratings; fibre optic sensors; holey fibres; photonic crystals; refractive index measurement; spectral line shift; temperature measurement; temperature sensors; LPFG; blue shift; liquid-filled PCF; liquid-filled photonic crystal fiber; long period fiber grating; refractive index measurement; single-mode fiber; temperature measurement; temperature sensitivity; Liquids; Optical fiber sensors; Photonic band gap; Refractive index; Temperature measurement; Temperature sensors; Long period fiber grating; Optical fiber sensors; Photonic crystal fiber; long period fiber grating; photonic crystal fiber;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2375337
