为实现光纤光栅的高速精确解调,设计了3 d B带宽在1~3 nm之间的宽带布拉格光栅,进行波长寻峰分析,并进行了实验验证。实验结果表明,使用CCD检测光栅反射光谱信号时,像素点间波长间距固定,带宽较高的布拉格光栅可得到更多有效像素点,从...为实现光纤光栅的高速精确解调,设计了3 d B带宽在1~3 nm之间的宽带布拉格光栅,进行波长寻峰分析,并进行了实验验证。实验结果表明,使用CCD检测光栅反射光谱信号时,像素点间波长间距固定,带宽较高的布拉格光栅可得到更多有效像素点,从而提高了光栅中心波长解调精度。温度测量对比实验表明,宽带FBG的解调精度相比普通光纤光栅提高了37.7%。展开更多
When a structure material is damaged by impact events, the reliability and lifetime of the material will be severely af- fected. So impact location is considered as the prime approach for structural health and damage ...When a structure material is damaged by impact events, the reliability and lifetime of the material will be severely af- fected. So impact location is considered as the prime approach for structural health and damage monitoring. In this study, a novel fiber Bragg grating （FBG） impact location system based on broadband light source is designed, aiming at the shortcoming of existing location systems based on FBG. An improved localization algorithm based on the time difference of arrival （TDoA） is proposed for impact location. According to this algorithm, the impact position can be accurately predicted without wave velocity. Impact planar location experiments are carried out for verification of the FBG impact location system and algorithm on a 400 mmx400 mmx3 mm aluminum alloy plate. The resulted locating error shows high precision and good stability of the proposed system.展开更多
文摘为实现光纤光栅的高速精确解调,设计了3 d B带宽在1~3 nm之间的宽带布拉格光栅,进行波长寻峰分析,并进行了实验验证。实验结果表明,使用CCD检测光栅反射光谱信号时,像素点间波长间距固定,带宽较高的布拉格光栅可得到更多有效像素点,从而提高了光栅中心波长解调精度。温度测量对比实验表明,宽带FBG的解调精度相比普通光纤光栅提高了37.7%。
基金supported by the National Natural Science Foundation of China(Nos.61503218,61403233,61573226 and 61473176)the Excellent Young and Middle-Aged Scientist Award Grant of Shandong Province of China(No.BS2013DX018)the Natural Science Foundation of Shandong Province for Outstanding Young Talents(No.ZR2015JL021)
文摘When a structure material is damaged by impact events, the reliability and lifetime of the material will be severely af- fected. So impact location is considered as the prime approach for structural health and damage monitoring. In this study, a novel fiber Bragg grating （FBG） impact location system based on broadband light source is designed, aiming at the shortcoming of existing location systems based on FBG. An improved localization algorithm based on the time difference of arrival （TDoA） is proposed for impact location. According to this algorithm, the impact position can be accurately predicted without wave velocity. Impact planar location experiments are carried out for verification of the FBG impact location system and algorithm on a 400 mmx400 mmx3 mm aluminum alloy plate. The resulted locating error shows high precision and good stability of the proposed system.
