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以太赫兹(THz)反射成像技术和THz时域光谱透射技术对公称外径D=10mm聚乙烯电熔接头(包含夹杂、分层等缺陷)进行检测,获得接头在不同扫描纵深(Z_1=3mm,Z_2=5mm,Z_3=7mm)的层析图像和时域波形。结果表明:图像可清晰显示样品的夹杂(金属丝)和埋藏缺陷,且不同纵深的层析图像都揭示了管道内壁因流体冲刷产生的机械损伤位置;对THz时域波形进行分析计算获得样品的分层厚度;以样品分层厚度反推THz波的强度,为THz时域光谱装置校准提供了参考。
THz reflectance imaging technology and THz time-domain spectral transmission technology were used to detect the polyethylene fused joints (inclusions, delamination and other defects) with nominal diameter D = 10mm, and the joints were scanned under different scanning depths (Z_1 = 3mm, Z_2 = 5mm, Z_3 = 7mm), and time-domain waveforms. The results show that the images can clearly show the inclusions (wires) and burial defects of the samples, and the tomographic images at different depths reveal the mechanical damage location of the inner wall of the pipeline due to fluid erosion. The THz time-domain waveforms are analyzed and calculated to obtain the samples The thickness of the layer was deduced. The strength of the THz wave was deduced from the layer thickness of the sample, which provided a reference for the calibration of the THz time-domain spectrometer.