中文摘要：

通过试验分析和仿真计算来研究脉冲太赫兹波在船舶有机防护涂层的传播特性。采用太赫兹脉冲成像系统的反射模式对不同结构的涂层样品进行试验检测，同时采用有限时域差分法进行仿真计算，为船舶涂层的太赫兹无损检测和评估提供理论支撑。结合脉冲响应函数，给出了多层结构涂层厚度无损定量评估的方案，并对试验信号和仿真结果进行处理。结果表明，太赫兹脉冲检测能够达到满意的检测精度，具有较强的涂层厚度定量分析能力。

英文摘要：

A test analysis and simulation research on terahertz nondestructive detection of marine protective coatings is carried out to investigate the propagation of terahertz radiation in coatings. The samples with different coating structures are detected using terahertz pulse imaging （TPI） system in reflection mode, while the model is established and calculated using finite-difference time-domain method The model can provide theoretical basis for nondestructive test and evaluation of marine protective coating system by TPI technology. The impulse response functions are extracted from the tested and simulated TPI signals for quantitative nondestructive evaluation （QNDE） of coating thickness. The results show that TPI technology can achieve high detection accuracy, and is of strong quantitative analysis abillity for coating thickness.