基于THz波的玻璃纤维复合材料无损检测方法研究

NON-DESTRUCTIVE INSPECTION METHOD FOR GLASS FIBER COMPOSITE BASED ON THz WAVE

太赫兹具有透视性、安全性等特点,近年来在无损检测领域得到了较快的发展和应用,以返波振荡管连续太赫兹波成像系统对5mm厚的玻璃纤维复合材料进行无损检测实验,其中包括热损伤(dmin=0.5mm)、空气分层(smin=0.5mm2)等缺陷,获得样品的成像结果及数据。结果表明,返波振荡管连续太赫兹波成像技术对从背面对玻璃纤维复合材料样品中的两种缺陷有清晰成像,且结合成像数据,可排除样品中环氧树脂的影响,验证不同缺陷之间的特性,进一步确定损伤类型。

There has been a series of significant advances and applications in terahertz （THz） technologies, terahertz （THz） wave with its perspectivity and safety was widely applied in the field of nondestructive testing. The unique properties help them become effective tools for non-destructive detection. With the increased utilization, the backward wave oscillator terahertz continuous wave imaging system was used to perform non-destructive testing of glass fiber composite material whose thickness is 5mm. Imaging and data of the sample within heat damage （ dmi,, = 0.5ram）, air delamination （smin = 0. 5mm2） was obtained. The results show that heat damage and delamination of glass fiber reinforced plastic （GFRP） reference sample was detected from the back side. Additionally, glass fiber reinforced plastic （GFRP） samples were evaluated with respect to the measurement of material properties, the at- tenuation caused by epoxy was proved to be insignificant, and the particular features of the defects in sample are recognized, benefiting to identify the defects.