中文摘要：

对波前编码技术实现景深延拓的原理进行了研究，分析了波前编码系统成像对离焦不敏感的原因，得到了波前编码光学系统景深延拓扩展率公式，发现了景深延拓扩展率与位相板参量的关系．利用Zemax设计了波前编码光学系统，用Matlab进行了成像模拟实验，实验结果表明，波前编码系统能提高传统光学系统的景深，提高的倍数由三次相位板的相位常量决定．

英文摘要：

The principle of extending of depth of field was studied, it is analyzed the reasons that the imaging of wavefront coding system is insensitive to defocus, obtains a formula of extension ratio of the depth of field（DOF） for wavefront coding imaging system, and discovers the relationship between the extension ratio of the DOF and the parameters of the phase plate of the wavefront coding system. A wavefront coding optical system is designed by Zemax, and a simulating imaging experiment is made by Matlab. The experimental results indicate that a wavefront coding system is able to extend the DOF of the optical system,and the extension ratio is determined by the phase constant of the cubic plate.