Fiber modal interferometer with embedded fiber Bragg grating for simultaneous measurements of refractive index and temperature

被引：49
|
作者：
Gao, Shecheng [1 ]
Zhang, Weigang [1 ]
Zhang, Hao [1 ]
Geng, Pengcheng [1 ]
Lin, Wei [1 ]
Liu, Bo [1 ]
Bai, Zhiyong [1 ]
Xue, Xiaolin [1 ]
机构：
[1] Nankai Univ, Inst Modern Opt, Minist Educ, Key Lab Opt Informat Sci & Technol, Tianjin 300071, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2013年 / 188卷
基金：
中国国家自然科学基金;
关键词：
Mach-Zehnder interferometer; Optical fiber sensor; Fiber Bragg grating; Refractive index measurement; Temperature measurement; LONG-PERIOD; OPTIC SENSOR; REFRACTOMETER; LASER;
D O I：
10.1016/j.snb.2013.07.082
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A highly sensitive and compact fiber-optic sensor for simultaneous measurement of refractive index (RI) and temperature has been proposed and experimentally demonstrated. The device is based on a fiber modal interferometer assisted by an embedded fiber Bragg grating, which helps to resolve the crosstalk issue. The fiber modal interferometer consists of an Up-Fusion-Bitaper (UFBT) pair to excite high-order cladding-modes and re-couple them to the fiber core. For high order cladding mode involved in the interference, the implemented sensor yields high spectral sensitivities of -197.03 +/- 7.35 nm/RIU (refractive index unit) for a refractive index (RI) range of 1.365-1.415 and 63.7 +/- 1.84 pm/degrees C for a temperature range from 20 to 80 C, respectively. Simultaneous measurement of ambient RI and temperature has been experimentally demonstrated. The maximum RI and temperature measurement errors are +0.00054 RIU and +0.7 degrees C, respectively. These results demonstrate the feasibility of this configuration for reliable RI-based chemical and biochemical monitoring. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：931 / 936
页数：6
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