太赫兹成像的优势在于能够穿透大多数非金属、非极性物质进行隐藏物的探测，而且不会对生物体造成伤害，因此，对常见包装品和衣物的穿透能力对于太赫兹成像系统的评估显得十分重要。利用CO2激光抽运太赫兹激光器所搭建的2.52 THz透射扫描成像系统对剃须刀、铅笔字、纸币和塑料瓶盖等多种物体进行了穿透力实验；以纸、纸质快递信封和实验服为遮挡物，进行了成像对比分析。实验结果表明，成像装置可以穿透13层A4纸、双层实验服或双层特快专递信封成像，最大插入损耗近50 dB。

Terahertz (THz) imaging has the advantage that the THz radiation can penetrate most nonmetal and nonpolar materials for concealed objects detection, while it is harmless to organism. The penetration ability for common packaging materials and clothes thus become very important to evaluate a THz imaging system. In the paper, penetration experiments are carried out by use of a 2.52-THz transmission-mode scanning system. The system is constructed based on a CO2 laser pumped THz laser. The imaging targets are razor blade, penciled character, banknote, and plastic bottle cap. Paper, paper envelope, and lab gown are used as shelters, and the imaging results are compared and analyzed. The experimental results demonstrate that the system can image through 13 pieces of A4 paper, 2 layers of lab-gown, or 2 layers of paper envelope. The maximum attenuation approaches 50 dB.