Chinese Optics Letters, 2012, 10 (3): 030605, Published Online: Nov. 18, 2011
Simultaneous temperature and refractive index measurement of liquid using a local micro-structured f iber Bragg grating Download: 775次
060.2270 Fiber characterization 060.2280 Fiber design and fabrication 060.2370 Fiber optics sensors 060.2390 Fiber optics, infrared
Abstract
An alternative solution for the simultaneous measurement of temperature and refractive index is presented. A local micro-structured fiber Bragg grating (LMSFBG) is formed as the sensing head, in which a standard grating is etched by HF. According to the phase shift theory, the main spectral change of the LMSFBG is the formation of a narrow allowed band, which is strongly dependent on the etching features and the surrounding refractive index. As such, the temperature and refractive index measurements can be achieved by the shifts of the double peaks and narrow allowed band, and their fitting linearity coefficients are 0.996 and 0.994, respectively. Thus, the reflection and transmission peaks of the LMSFBG have a good linear relationship with temperature and refractive index.
Ye Cao, Yinfei Yang, Xiufeng Yang, Zhengrong Tong. Simultaneous temperature and refractive index measurement of liquid using a local micro-structured f iber Bragg grating[J]. Chinese Optics Letters, 2012, 10(3): 030605.