BN/SiBCN light-leakage-proof coatings of silica optical fiber for long term sensors at high temperatures  

作　　者：Xin’gang LUAN Xinming XU Rong YU Qiqi ZHANG Sam ZHANG Laifei CHENG 

机构地区：[1]Science and Technology on Thermo Structural Composite Materials Laboratory,Northwestern Poly technical University,Xian 710072,China [2]Faculty of Materials and Energy,Southwest University,Chong Qing 400715,China

出　　处：《Chinese Journal of Aeronautics》2021年第5期93-102,共10页中国航空学报（英文版）

基　　金：co-supported by the National Natural Science Foundation of China(No.91960105,91860140);the National Basic Research Program of China(973 Program);the Open Fund of the State Key Laboratory on Integrated Optoelectronics,China(No.IOSKL2018KF05);the Fundamental Research Funds for the Central Universities(No.SWU118105)。

摘　　要：SiBCN and BN/SiBCN light-leakage-proof coatings were prepared on silica optical fibers for sensing applications at high temperatures.Scanning electron microscopy was used to characterize the surface morphology and microstructure of the coated fiber.Mechanical and optical properties of the coated fiber were characterized by Raman,optical and tensile tests.Compared with the original fiber,the tensile strength of Si BCN and BN/Si BCN coated fiber show an increase of about 60%and 90%at room temperature,respectively.In addition,the tensile strength of BN/Si BCN coated silica optical fiber was increased by about 42%at 700°C.It has been found that the improvement of the strength of BN/Si BCN coated silica optical fiber is related to the healing of defects and residual compressive stress in fibers.From the light transmittance performance of the coated fiber,it was found that BN/Si BCN double coating could be an ideal total reflection solution to protect silica optical fiber from light leakage during high temperature sensing operation.

关 键 词：BN/SiBCN double coating High temperature Optical fiber Sensor SILICA 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]