摘要
A weak fiber Bragg grating(WFBG) is an ideal quasi-distributed optical fiber sensor. Special attention should be paid to the spectrum and sensing performance of the WFBG at extreme temperatures due to its poor reflection intensity. In this Letter, the temperature characteristics of the WFBG from-252.75°C to 200.94°C are experimentally investigated. Five WFBGs with reflectivity from ~0.25% to ~10% are used in the experiments. The reflectivity variations and wavelength shifts at different temperatures are studied. Experimental results show that the WFBG can survive and work at extreme temperatures, but the performance is affected significantly.The reflectivity is affected significantly by both cryogenic temperature and high temperature. The temperature responses of Bragg wavelengths in the wide temperature range are also obtained.
A weak fiber Bragg grating(WFBG)is an ideal quasi-distributed optical fiber sensor.Special attention should be paid to the spectrum and sensing performance of the WFBG at extreme temperatures due to its poor reflection intensity.In this Letter,the temperature characteristics of the WFBG from-252.75℃ to 200.94℃ are experimentally investigated.Five WFBGs with reflectivity from^0.25% to^10% are used in the experiments.The reflectivity variations and wavelength shifts at different temperatures are studied.Experimental results show that the WFBG can survive and work at extreme temperatures,but the performance is affected significantly.The reflectivity is affected significantly by both cryogenic temperature and high temperature.The temperature responses of Bragg wavelengths in the wide temperature range are also obtained.
作者
Xiaojun Fan
Junfeng Jiang
Xuezhi Zhang
Kun Liu
Shuang Wang
Tiegen Liu
樊晓军;江俊峰;张学智;刘琨;王双;刘铁根(School of Precision Instrument and Opto-electronics Engineering,Tianjin300072,China;Tianjin University,Tianjin Optical Fiber Sensing Engineering Center,Institute of Optical Fiber Sensing of Tianjin University,Tianjin300072,China;Key Laboratory of Opto-electronics Information Technology,Ministry of Education,Tianjin University,Tianjin300072,China)
基金
supported by the National Natural Science Foundation of China(Nos.61735011,61675152,U1833104,and 61405159)
the Natural Science Foundation of Tianjin City(No.16JCQNJC02000)
the National Key Research and Development Plan of China(No.2016YFC0401902)
the open project of Key Laboratory of Opto-electronics Information Technology,Ministry of Education(No.2018KFKT013)
