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在波前编码技术中,通过立方相位板的光学调制和后续图像处理,扩展了系统景深.其中系统的光学调制过程,可以用广义光瞳函数描述.系统的广义光瞳函数描述了光通过立方相位板后相位的变化过程.立方相位板是波前编码技术的关键器件,装配及加工误差直接影响系统的成像性能.本文通过推导不同误差情况下的广义光曈函数,得到了立方相位板装配及加工误差对点扩散函数(PSF)和调制传递函数(MTF)的变化规律.评估这些规律,得到了装配和加工误差对系统成像性能的变化规律,为装配和加工过程提供了基本的指导.文中分析了不同装配误差和加工误差对于系统性能的影响,其中围绕Z轴的装配误差和加工中振动引起的正弦形状误差对于MTF的影响最大.因此,在装配和加工中应尽量避免围绕Z轴的装配误差和正弦形状误差,正弦形状误差的PV值应保持在0.5μm之内.
In the wavefront coding technique, the system depth of field is extended by the optical modulation of the cubic phase plate and subsequent image processing, in which the optical modulation process of the system can be described by the generalized pupil function.The system generalized pupil function describes the light through the cube The phase of the phase plate after the phase change process.Cube phase plate is the key component of the wavefront coding technology, assembly and processing errors directly affect the imaging performance of the system.This paper derives the generalized optical 曈 function under different error conditions, the cubic phase plate assembly (PSF) and Modulation Transfer Transfer Function (MTF) are discussed.The variation rules of PSF and MTF are evaluated, and the variation rules of assembly and machining errors on the system imaging performance are obtained, which provide the basic guidance for assembly and machining process. In this paper, the influence of different assembly errors and machining errors on the system performance is analyzed, in which the assembly error around the Z-axis and the sine shape error caused by the vibration during machining have the greatest impact on the MTF.Therefore, in the assembly and processing, The assembly error and the sine shape error, the sine shape error PV value should be maintained within 0.5μm.