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通过傅里叶光学理论和透镜成像理论对轴棱锥线聚焦与凸透镜点聚焦两种成像系统进行分析,并探讨了它们对成像系统焦深的影响。利用ZEMAX光学设计软件,仿真模拟出系统在不同轴向距离的截面光强分布图。以蓝光LED为光源,对这两种成像系统进行实验验证,拍摄不同轴向距离处的截面光强分布图。结果表明,轴棱锥所具有的线聚焦特性,能将光线连续地会聚到沿轴线不同位置上,图像的清晰度高,且在最大无衍射距离内无需调焦,具有更大的焦深;理论分析、仿真模拟与实验结果相吻合。
The imaging systems of axicon pyramid focusing and lenticular point focusing are analyzed by Fourier optics theory and lens imaging theory, and their influence on the depth of focus of the imaging system is also discussed. ZEMAX optical design software was used to simulate the cross-sectional intensity distribution of the system at different axial distances. Using blue LED as light source, the two imaging systems were experimentally verified, and the cross-sectional intensity distributions at different axial distances were taken. The results show that the axial focusing characteristics of the axicon can continuously converge the light to different positions along the axis, the image has high definition and does not need to be adjusted and has a greater depth of focus in the maximum non-diffraction distance. Theory Analysis, simulation and experimental results are consistent.