An Optical Imaging System with Large Depth-of-Field Extended Wavefront Encoding Space

Abstract

The invention discloses an optical lens imaging combination unit and an optical imaging system for wavefront coding space large-depth-of-field continuation. The optical lens imaging combination unit comprises an odd-phase coding plate (1) and an objective lens set (2), wherein the objective lens set is composed of seven single lenses which are sequentially arranged along the optical axis towards adetector protection glass window (3); and the odd-phase coding plate is located at the outermost side of the optical lens imaging combination unit, the outward face is a plane, the other face is a free-form surface, and the form of the free-form surface meets the equation thatZ(X,Y)=AX<3>+BXY<3>+CX<2>Y+DY<3>, wherein the following equations including A=9.8576*10<-3>, B=2.1324*e<-5>, C=2.1324*e<-5>, and D=9.8576*10<-3> are met. Through the system, the depth-of-field of camera imaging can be greatly expanded, and the range is expanded to 5m-110km; a coding lens is only added to the optical-lensside of a camera, a relevant decoding and application algorithm is added to an electronic circuit, the size, weight and power consumption cost are small, mechanical focusing is not needed in the distance changing process, delay is short, implementation of a guidance control algorithm is benefited, and the system has powerful application prospects in the fields of attack-defense confrontation andautomatic driving under a high-mobility scene.

Description

technical field [0001] The present invention relates to an optical imaging system and method for expanding the depth of field of a visible light optical system by using a combination of optical design and computational optics, and in particular to an optical imaging system for expanding the depth of field of a visible light optical system by using wavefront coding imaging technology and method. Background technique [0002] In recent years, with the continuous upgrading of detector devices and the continuous improvement of detection system requirements for various applications, higher requirements have been put forward for the performance and optimal design of visible light optical systems. Generally, the receiving area of ​​the visible light detector is relatively small, and the depth of field of the visible light optical system is generally not too large. For example, the prior art CN106324832A, CN106199956A, CN204719330U, etc. all have the defect that the corresponding d...

AI Technical Summary

Problems solved by technology

On a fixed-focus camera with high reliability, intelligent recognition tasks can be realized with a very small time cost, and clear imaging requirements without delay can be met under high maneuvering conditions, which is difficult to guarantee for traditional fixed-focus optical systems

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