High-Temperature Sensor Based on Fabry-Perot Interferometer in Microfiber Tip
Zhenshi Chen,
Songsong Xiong,
Shecheng Gao,
Hui Zhang,
Lei Wan,
Xincheng Huang,
Bingsen Huang,
Yuanhua Feng,
Weiping Liu,
Zhaohui Li
Affiliations
Zhenshi Chen
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
Songsong Xiong
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Shecheng Gao
Department of Electronic Engineering, College of Information Science and Techonology, Jinan University, Guangzhou 510632, China
Hui Zhang
School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
Lei Wan
Institute of Optoelectronic Material and Technology, South China Normal University, Guangzhou 510631, China
Xincheng Huang
Department of Electronic Engineering, College of Information Science and Techonology, Jinan University, Guangzhou 510632, China
Bingsen Huang
Department of Electronic Engineering, College of Information Science and Techonology, Jinan University, Guangzhou 510632, China
Yuanhua Feng
Department of Electronic Engineering, College of Information Science and Techonology, Jinan University, Guangzhou 510632, China
Weiping Liu
Department of Electronic Engineering, College of Information Science and Techonology, Jinan University, Guangzhou 510632, China
Zhaohui Li
State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
A miniaturized tip Fabry-Perot interferometer (tip-FPI) is proposed for high-temperature sensing. It is simply fabricated for the first time by splicing a short length of microfiber (MF) to the cleaved end of a standard single mode fiber (SMF) with precise control of the relative cross section position. Such a MF acts as a Fabry-Perot (FP) cavity and serves as a tip sensor. A change in temperature modifies the length and refractive index of the FP cavity, and then a corresponding change in the reflected interference spectrum can be observed. High temperatures of up to 1000 °C are measured in the experiments, and a high sensitivity of 13.6 pm/°C is achieved. This compact sensor, with tip diameter and length both of tens of microns, is suitable for localized detection, especially in harsh environments.
