Thermal effect on odd-symmetric phase mask in wavefront-coded athermalized infrared imaging systems

分析了基于波前编码技术的无热化光学系统中相位掩模板的自身热效应，得到了不同温度下光瞳处相位板相位函数的变化.分析了由相位板热效应引起的波前编码系统成像特性的变化.通过数值及图像仿真证明了相位板热效应对波前编码无热化光学系统性能产生的影响.结果表明，相位板热效应对系统MTF(调制传递函数)的离焦不变特性和编码图像的可复原性产生严重的影响.;Thermal effect on phase masks in wavefrontcoded athermalized imaging systems is analyzed. Several wellknown oddsymmetric phase functions at different temperature are derived. The properties of phase functions suffering from thermal effect are presented. The performances of the phase functions are evaluated with and without considering thermal effect by numerical simulation. The results show that the similarity of outoffocus MTFs and recoverability of blurred encoding images of the wavefrontcoded athermalized system are degraded severely by the thermal effect.