研究了连续太赫兹波技术在航天隔热复合材料粘接缺陷无损检测领域的应用。使用环氧树脂作为粘接剂，制作了隔热复合材料与金属基板的粘接样件。采用频率范围为0.23\~0.32 THz的反射式调频连续太赫兹波检测系统，对粘接层进行检测。使太赫兹探头聚焦在粘接层处，获得层析图像。根据焦平面下0,1,2 mm处的灰度图像，判断出粘接面的缺陷大小、形状和位置，并用自适应Canny算子边缘检测法对所得图像进行处理。实验与分析表明，应用连续太赫兹成像方法，结合适当的图像检测技术，可以实现对隔热复合材料与粘接基板之间粘接缺陷的无损检测。

This paper studies the applications of continuous terahertz wave in nondestructive testing for bonding defects in aerospace thermal insulation composite. Aerospace thermal insulation composite and metal substrates are bonded by epoxy resin adhesive as the experimental sample. The adhesive interface is tested by the reflection type frequency modulated continuous terahertz wave testing system and the frequency range is 0.23\~0.32 THz. Tomographic images are obtained by making the terahertz probe focus on the adhesive interface. The size, shape and position of the defect can be judged by the gray value of images which at 0, 1 and 2 mm below the focal plane. In the imaging processing, edge detection is managed with adaptive threshold Canny operator. The adhesive interface between metal substrates and aerospace thermal insulation composite can be tested by applying the method of continuous terahertz imaging and combined with proper image detection technique.