搭建了以0. 2 THz返波管振荡器源、热释电探测器、小型自动旋转光学平台等组成的太赫兹波目标散射特性实验测试系统, 对两种不同粗糙度铜盘表面的散射特性进行了测试, 表明: 太赫兹金属粗糙目标散射中导体表面的感应电流产生电磁散射和粗糙导体表面引起的朗伯散射是同时存在的; 在斜入射时这种近似于朗伯体的金属粗糙表面几乎可以被看成镜体, 但随着目标表面的粗糙度变大, 反射变弱, 散射增强, 主峰向小于反射角的方向偏移; 在垂直入射的情况下, 散射角小于40度时散射曲线下降较快, 超过40度散射曲线变化变得很缓慢, 但在50度附近很多材料都会出现一个小的散射峰.

A system for the measurement of Terahertz-wave scattering was set up. It includes 0.2THz BWO, pyroelectric detector and an automatic optical table. With this system, THz wave scattered by two copper plates with different surface roughness were measured. The result showed that electromagnetic scattering produced by the terahertz wave induced current and lambert scattering caused by the rough surface of the conductor exist at the same time. The metal rough surface approximated to lambert body could be considered as mirror when terahertz wave was obliquely incident. However, with the increase of roughness, the reflection gets weaker while the scattering becomes stronger, and the main peak shifts toward the angle smaller than that of reflection. Under the situation of normal incidence, the scattering curve decreased more quickly at the scattering angle less than 40°and changed slowly when the angel was more than 40°. For many materials, scattering peak appeared when the scattering angle was around 50°.