基于波前编码的紧凑型大光圈双波段系统设计

Design of a Compact Large-Aperture Dual-Band Imaging System Based on Wavefront Coding

摘要: 为满足在低照度环境下系统对高光通量和多光谱感知能力的需求，针对传统折射式多光谱大光圈系统景深浅、宽波段色差校正困难的问题，本文提出了一种基于波前编码的紧凑型大光圈双波段成像系统的设计。系统采用反射式结构作为多光谱光线的共同光路，引入自由曲面以及非球面同时对两个波段的成像进行波前编码，并使用分光棱镜对光谱进行分离，对于编码图像，使用了加入点扩散函数后的DeblurGANv2网络架构进行图像解码。结果表明，该系统的两个波段的景深都拓展了10倍，两个波段的调制传递函数在40 cycles/mm处都大于0.1，图像解码能够较好地还原图像。

Abstract: In order to meet the demand for high luminous flux and multispectral sensing capability of the system under low illumination environment, and to address the problems of shallow depth of field and difficulty in wide-band chromatic aberration correction in traditional refractive multispectral large aperture system, this paper proposes a compact large aperture dual-wavelength imaging system design based on wavefront coding. The system adopts a reflective structure as the common optical path for multispectral light, introduces free-form surfaces as well as aspherical surfaces for wavefront coding of the two bands simultaneously, and separates the spectra using a beam-splitting prism, and for the coded images, uses the DeblurGANv2 network architecture after adding the point diffusion function for image decoding. The results show that the depth of field of the system is expanded by a factor of 10 in both bands, the modulation transfer function of both bands is greater than 0.1 at 40 cycles/mm, and the image decoding is able to restore the image well.