多光谱共孔径无穷远目标器设计

Design of multi-spectral common aperture infinity collimator

为实现场外车载光电跟踪仪的各光轴一致性检校,提出一种利用多光谱共孔径无穷远目标器、转光管和移动机构来实现对各光轴检校的方法,并对目标器进行了光学设计和总体结构设计,对影响检校的主要误差进行了分析。目标器总体尺寸为750mm×120mm×100mm,采用离轴双曲面反射式光学系统,焦距为1 200mm,孔径为50mm,视场2°,分划板采用ZnS材料,光源采用溴钨灯,利用Zemax光学设计软件优化系统,实现焦面最大弥散斑为RMS 35.766μm,在空间频率5lp/mm处,OTF均高于0.3,各项指标满足检校要求。

In order to calibrate the consistency of optical axes of the field vehicle photoelectric tracker,a method for using the multi-spectral common-aperture infinity collimator,reflex light tubes,and moving mechanism was put forward to realize the calibration of each optical axis,and the optical design of collimator and the overall structural design were performed.In addition,the main errors affecting the calibration were analyzed.Results show that the overall size of the target is 750 mm ×120 mm × 100 mm,it uses an off-axis hyperboloidal reflective optical system with a focal length of 1 200 mm,an aperture of 50 mm and a field of view of 2°.The reticle uses ZnS and the light source uses tungsten bromine lamp.The system is optimized with Zemax optical design software,the maximum focal spot root-mean-square（RMS）achieves 35.766μm,and the optical transfer functions（OTFs）are all higher than 0.3 at the spatial frequency of 5 lp/mm.All the indicators meet the calibration requirements.