For most reflective images, scanning of the light field is carried out by a scanning mirror drum, so back scattering light from the reflective mirror, which is illuminated by a laser beam, brings inevitably about a Doppler frequency shift. 旋转镜鼓式热像仪对光场的扫描主要由镜鼓来完成,在激光束的照射下,镜鼓棱及其邻域的后向散射不可避免地给散射光引进了一个附加的多普勒频移。
Mirror, mirror, on the wall the effect of scanning drum and prism on performances of infrared imaging systems 扫描镜鼓和棱镜对红外成象系统性能的影响