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可见光景象模拟器是电视制导系统综合测试的核心设备。设计了一款以LCD为图像源的大视场和大出瞳距的可见光景象模拟器,包括光学投影系统和相应的照明系统。研究了大出瞳距、大相对孔径情况下无限远投影光学系统的像差特性以及设计方法,采用非远心的系统设计方案,解决了由于出瞳距大而造成的系统像差难以校正的问题,增强了景象模拟器对转台的适应性,增大了工作视场。研究了非远心状态下LCD均匀照明的特点,采用复眼透镜阵列与柯勒照明原理相结合的方法设计了配套的照明系统,解决了非远心状况下均匀照明和光瞳衔接的问题。仿真系统的全视场角为7°,F#为3.1,出瞳距离为700 mm。系统的畸变小于0.5%,在奈奎斯特频率58 lp/mm处,零视场的调制传递函数大于0.7,全视场的调制传递函数大于0.45。照明系统的照明均匀度达到了91.3%,满足仿真均匀性的要求。
Visible Scene Simulator is the core equipment of TV guidance system comprehensive test. We design a visible scene simulator with large field of view and large interpupillary distance with LCD as the image source, including the optical projection system and the corresponding lighting system. The aberration characteristics and design method of infinite projection optical system with large exit pupil distance and large relative aperture are studied. The non-telecentric system design scheme is adopted to solve the problem that the system aberration due to large exit pupil distance is difficult to correct Problem, enhance the adaptability of the scene simulator turntable, increasing the working field of view. The characteristics of uniform illumination of LCD under non-telecentric conditions are studied. The matching illumination system is designed by the combination of the fly-eye lens array and Cole illumination principle, which solves the problem of uniform illumination and pupil convergence under non-telecentric conditions. The full field of view of the simulation system is 7 °, the F # is 3.1 and the exit pupil distance is 700 mm. The system distortion is less than 0.5%. At the Nyquist frequency of 58 lp / mm, the zero-field modulation transfer function is greater than 0.7 and the full-field modulation transfer function is greater than 0.45. Lighting system lighting uniformity reached 91.3%, to meet the requirements of simulation uniformity.