基于波前编码技术红外光学系统无热化研究

波前编码技术是将光学成像与数字图像处理技术相结合,在系统的光瞳处通过添加特殊设计的相位板,对入射光波波前进行重新调制,再经过解码得到清晰的图像,使系统对离焦不敏感,与红外无热化的理念相同。文中比较了原光学系统和采用波前编码系统在不同环境温度下的调制传递函数（MTF）,使用Matlab模拟中间光学部分成像并滤波。结果表明：将波前编码技术应用到红外光学系统当中,可以使系统对由环境温度变化引起的热离焦不敏感,达到无热化的目的。

Research on Athermalization of Infrared Optical System Based on Wavefront Coding

Wavefront coding combines both optical image and digital image processing. A phase mask specially designed is added to the pupil of optical system to re-modulate the wave front. But the intermediate image which is ambiguous can be tumed into a sharp image by digital filtering, making the system not sensitive to defocus. This is same as the athermalization theory of infrared optical system. In this paper, MTF of the optical system with phase mask are com- pared with the outcome before using phase mask.The imaging process of a wavefront coding system and the output of digital filtering were simulated with MATLAB. The result show that applying the theory of wavefront coding technolo- gy to infrared optical system can make the system not sensitive to thermal defocus, athermalizing the optical system.