FFPI-FBG hybrid sensor to measure the thermal expansion and thermo-optical coefficient of a silica-based fiber at cryogenic temperatures  

作　　者：李立彤 张东生 文晓艳 彭思思 

机构地区：[1]National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology [2]Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education,Wuhan University of Technology [3]School of Science, Wuhan University of Technology [4]Wuhan Institute of Marine Electric Propulsion,CSIC

出　　处：《Chinese Optics Letters》2015年第10期21-25,共5页中国光学快报（英文版）

基　　金：supported by the National High Technology Research and Development Program (No. 2012AA041203);the National Natural Science Foundation of China (No. 61307099)

摘　　要：In this Letter, a sensor consisting of a fiber Bragg grating（FBG） and a fiber Fabry–Perot interferometer（FFPI）sensor is developed to measure the coefficient of thermal expansion（CTE） and the thermo-optical coefficient（TOC） of a silica-based optical fiber at cryogenic temperatures. The FFPI is fabricated by welding together two acid-etched fibers. The temperature performance of the FFPI-FBG hybrid sensor is studied in the temperature range of 30–273 K. The CTE and TOC of the optical fiber at cryogenic temperatures are derived analytically and verified by experiments.In this Letter, a sensor consisting of a fiber Bragg grating（FBG） and a fiber Fabry–Perot interferometer（FFPI）sensor is developed to measure the coefficient of thermal expansion（CTE） and the thermo-optical coefficient（TOC） of a silica-based optical fiber at cryogenic temperatures. The FFPI is fabricated by welding together two acid-etched fibers. The temperature performance of the FFPI-FBG hybrid sensor is studied in the temperature range of 30–273 K. The CTE and TOC of the optical fiber at cryogenic temperatures are derived analytically and verified by experiments.

关 键 词：silica thermo interferometer Bragg grating verified welding analytically Fabry repetition 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]