Simultaneous temperature and refractive index measurement of liquid using a local micro-structured fiber Bragg grating  

作　　者：曹晔 杨寅飞 杨秀峰 童峥嵘 

机构地区：[1]Tianjin Key Laboratory of Film Electronic and Communication Devices,School of Computer and Communication Engineering,Tianjin University of Technology

出　　处：《Chinese Optics Letters》2012年第3期15-18,共4页中国光学快报（英文版）

基　　金：supported by the Tianjin Natural Science Foundation(No.11JCYBJC00100);the National Natural Science Foundation of China(Nos.60808004 and 61107052)

摘　　要：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 relationshi~ with tem^era,ture and refractive index.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 relationshi~ with tem^era,ture and refractive index.

关 键 词：Fiber Bragg gratings REFRACTOMETERS 

分 类 号：TN253[电子电信—物理电子学] O552.42[理学—热学与物质分子运动论]