【摘要】 在一块玻璃纤维环氧树脂复合材料板的热压固化过程中，人为加进不同种类、大小及放入深度的薄膜片，并预置一定大小的裂纹、分别利用反射法和透射法获取回波，并对其高速采样及截取，然后进行幅度谱、相位谱、功率谱、相关谱、自相关函数及互相关函数平方包络提取的分析，获得了一些针对不同预置杂质、缺陷的特征．更多还原

【Abstract】 Purposely placing some square slices of different materials and sises into thedifferent depth of a glass fiber-reinforeed epoxy resin composite laminatc which also wasintroduced a lcm crack. The laminate was tested with by a high-speed sampling board.Through analysis of amplitude spectrum. phase spectrum. power specurm, correlationspectrum and envelope of the square correlation functions, different characteristics weregotten for different foreign inclusions and cracks.更多还原