毫米波焦面阵成像技术研究

Ray tracing method,vector diffraction integral and the FDTD method are used to analyze focal plane imaging system of small F number at millimeter wavelengths and calculate the diffractive field distribution in the focal space of the imaging system for extension object. Optical transfer function of the lens with.aberration is calculated and imaging simulation is carried out. The frequency.dependance and focusing performance of diffractive lens is analyzed and the cause of the difference of diffractive efficiency between two type diffractive lens is interpreted. These results fill the literature blank for conventional optics theory deal with imaging.system of larger F number. We have obtained much information about resolution and aberration for many imaging system including extended hemispherical lens,.hyperbolic lens, spherical lens, reverse microscope and diffractive lens. The profile of lens is adjusted to change the field distribution on the lens surface so as the aberration is reduced and field-of-view of imaging system is extended. Focal plane element.structure, which may has high coupling efficiency with diffraction field, is also researched. All the results obtained is very useful for the design of millimeter wave fcoal imaging system especially for the matching design between focal plane array structure and imaging lens.

运用结合光学理论、电磁场理论、天线理论和数值方法的综合方法分析计算有像差小F数（F数等于或小于1）成像系统的焦区的矢量衍射场，分析系统的成像特性，探索减小像差扩大映〉耐揪叮芯拷姑嫣煜哒笤虢骨苌涑〉鸟詈咸匦裕谏鲜龉ぷ鞯幕∩现谱骱撩撞ń姑嬲蟪上裣低呈笛槟Ｐ停导视τ孟低车难兄平⒗砺奂际趸