The Design of a Photographic Objective Using Cubic Phase Plate
三次位相板编码系统的频率信噪比分析

The analysis tool,frequency signal-to-noise model,using in cubic phase plate (CPP) coding system is proposed.This model considers short noise and readout noise coming from CCD detector.According to perceived signal-to-noise theory,this model also considers the infection of modulate transfer function (MTF) which can realize the signal to noise ratio in different spatial frequencies.This SNR model can give an explicit analysis of CPP system and gives dependable references in CPP system design process.Using this model,the CPP system analyzed here can get 5 waves depth of focus in theory.It is proved that the model can work well.