Wave-front Coding Technology to Extend Depth of Field in Remote Sensing Optical System

Wave-front coding technology refers to placing a phase mask at the aperture stop of a traditional optical system, modulating the wavefront and phase of the incident light field at the pupil, and finally using the digital image processing method to decode to realize computational imaging. Depth of Field (DOF) is a significant issue, the wavefront of the optical system is modulated by inserting a phase plate, so that optical modulation transfer function (MTF) and point spread function (PSF) are not sensitive to the changes of the object distances within a large depth of field range. Finally, image restoration is achieved by decoding, and clear images with a large depth of field are obtained. Compared with previous work, we innovatively proposed a high-order polynomial phase plate design, considering manufacturing difficulty as an optimization factor, and finally realized 200m-100km ultra-large depth-of-field imaging in a remote sensing optical system without a focusing mechanism.