Research On Ghost Imaging Resolution Technology Based On Orthogonalization

In recent years,ghost imaging technology is widely used in biological microscopy,lidar,remote sensing ranging and other cutting-edge technologies.Ghost imaging,that is,the light source is divided into two paths by the beam splitter.One of the light paths passes through the object to be imaged and the total light intensity information of the object is collected by a single point detector without spatial resolution.This path is usually called object arm;Another optical path is collected by an area array detector with spatial resolution after free propagation,which is called the reference arm.Finally,the information of the two light paths is correlated,and the image of the object can be reconstructed on the reference light path without the object.Compared with traditional imaging,ghost imaging has its unique advantages,such as strong noise resistance,object image separation,suitable for all kinds of light sources and so on.Although the detection system of ghost imaging can break through the performance limit of existing observation tasks,it also exposes some shortcomings.Its common problems include long reconstruction time,low image quality and low spatial resolution,which all affect the further expansion of the application scene of ghost imaging.At the same time,it has also become a difficult problem to be solved by ghost imaging technology.The research of the subject is based on the above background problems.The focus of the research is to realize the high-quality and high spatial resolution imaging of ghost imaging.Through the discussion and analysis of the target realization mechanism,an effective resolution improvement method is proposed,that is,the resolution of ghost imaging is improved based on orthogonalization algorithm.Through the orthogonalization of the light field,the matrices of all the reference light fields involved in the operation are no longer related to each other,so as to reduce the transverse coherence between the light fields,break the limitation of the diffraction limit of the light field and improve the imaging resolution.In addition,this paper also proposes an experimental architecture combining ghost imaging and multimode fiber imaging,and realizes multimode fiber ghost imaging based on Orthogonalization.The method of optimizing the light field by orthogonalization is used to improve the problem of high randomization of the light field speckle at the far end of multimode fiber,and resist the low resolution problem to a certain extent.When the light field diverges to a certain extent,the resolution of the light field of multimode fiber after orthogonalization will no longer be affected.The feasibility of orthogonal multimode fiber imaging scheme in large depth of field is verified.We believe that this work will have important reference value for improving the imaging resolution of multimode fiber and help to further develop the application of endoscope.