High-sensitivity fiber optic temperature sensor based on CTFBG-FPI and Vernier effect

被引：18

作者：

Pan, Xue-Peng ^{[1
]}

Sun, C. A., I ^{[1
]}

Liu, Shan-Ren ^{[1
]}

Wang, B. O. ^{[1
]}

Gao, Meng-Meng ^{[1
]}

Guo, Q., I ^{[1
]}

Chen, Qi-Dai ^{[1
]}

Sun, Hong-Bo ^{[1
,2
]}

Yu, Yong-Sen ^{[1
]}

机构：

[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

[2] Tsinghua Univ, Dept Precis Instrument, State Key Lab Precis Measurement Technol & Instrum, Beijing 100084, Peoples R China

来源：

OPTICS LETTERS | 2023年 / 48卷 / 15期

基金：

中国国家自然科学基金;

关键词：

Fabry-Perot interferometers - Fiber optic sensors - Interferometry - Optical waveguides - Temperature measurement - Temperature sensors;

D O I：

10.1364/OL.496463

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel high-sensitivity temperature sensor based on a chirped thin-core fiber Bragg grating Fabry-Perot interferometer (CTFBG-FPI) and the Vernier effect is proposed and demonstrated. With femtosecond laser direct writing technology, two CTFBG-FPIs with different interferometric cavity lengths are inscribed inside a thin-core fiber to form a Vernier effect system. The two FPIs consist of two pairs of CTFBGs with a full width at half maximum (FWHM) of 66.5 nm staggered in parallel. The interferometric cavity lengths of the two FPIs were designed to be 2 mm and 1.98 mm as the reference arm and sensing arm of the sensor, respectively. The temperature sensitivity of this sensor was measured to be -1.084 nm/degrees C in a range of 40-90 degrees C. This sensor is expected to play a crucial role in precision temperature measurement applications. (C) 2023 Optica Publishing Group

引用

收藏

页码：3845 / 3848

页数：4

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