摘要
为了实时监测环氧树脂的固化过程,建立了基于光纤布拉格光栅(FBG)的固化监测系统。将裸FBG、石英毛细管封装FBG和高精度热电阻浸入到环氧树脂及其固化剂的混合物中,一起经历固化过程。在升降温过程中,用热电阻监测环氧树脂内部温度变化,用波长解调仪实时测量两种FBG的波长变化。实验结果表明,石英毛细管封装FBG监测到的温度变化趋势与热电阻监测结果相同;两种FBG的波长差反映了固化过程中的收缩应变,固化初期变化较大,之后逐渐减小。以玻璃态转变温度为分界点,直接植入环氧树脂的FBG温度灵敏度分别为石英毛细管封装FBG的5.3倍和为2.2倍。
In order to monitor curing process of epoxy resin in real time, the system based on fiber Bragg grating （FBG） is established. A bare FBG, a FBG packaged with quartz capillary and an accurate resist ance thermometer are immersed into the mixture of epoxy resin and curing agent,and are used to monitor the whole curing process. The change of temperature inside epoxy resin is detected by the resistance thermometer. Meanwhile, the reflection wavelengths of two fiber Bragg gratings are measured by the spectrum analyzer. Experimental results indicate that the temperature evolution monitored by the FBG packaged with quartz capillary is the same as that measured by the resistance thermometer. During curing process, inner strain changes of epoxy resin can be taken in by the variation of wavelength difference between FBGs. At the beginning of polymerization reaction,the strain inside epoxy resin quickly increases, and then gradually tends to a constant value. The temperature sensitivity of the FBG embedded with epoxy resin is 5.3 times of that of the FBG packaged with quartz capillary when temperature is lower than the glass transition temperature, and 2.2 times when temperature is higher than the glass transition temperature.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2013年第4期763-768,共6页
Journal of Optoelectronics·Laser
基金
黑龙江省教育厅科学技术研究(12521106)资助项目
