The Quality Of Multipath Effect Constraint Of Pseudo-thermal Light Source In Ghost Imaging

Ghost imaging is also called correlated imaging,which is an indirect imaging technique that uses spatially correlated image-forming objects to reconstruct an image of an object by using two beams of light.Only one beam interacts with the object and is collected by a barrel detector,while a single pixel cannot produce an image but can measure the total energy.The object is then reconstructed by combining this information with an image of the second beam,which never participates in the actual interaction or anywhere near the object itself.Unlike conventional imaging,an imaging lens in the optical path associated with thermo-optical imaging is not necessary.In addition,ghost imaging has a series of advantages against atmospheric turbulence,smog and other bad weather,which has become an important reason for its wide application.This paper is mainly based on the analysis of the influence of the multi-path effect constraint of pseudo-thermal light source in ghost imaging,and also proposes a set of devices to improve the image quality according to the original equipment.Firstly,the multipath effect in ghost imaging is discussed.It is well known that multipath effects in communication systems are important for signal quality.In correlated imaging,The reflected light from ground glass is used as a light source to trigger multipath effects,and compared with conventional devices that using transmitted light from ground glass.Both devices have a difference in propagation paths and are referred to as multipath effects in a broad sense.According to the basic theory of thermo-optical ghost imaging,the analytical expressions of multi-path effects of lightt are derived,numerical simulation and experimental analysis are carried out.The results show that ghost image using reflected light from ground glass has a destructive effect compared with the traditional ghost imaging,the resolution is slightly increased,and the signal-to-noise ratio is greatly reduced.This can be theoretically analyzed by the multi-path effect of the object light.In other words,ghost imaging using reflected light from ground glass does not achieve the desired image quality improvement.Secondly,the smoothness of the ground glass indicates that an excellent reflective material—aluminum,has been plated.The numerical simulation results show that ghost imaging using reflected light from the aluminized ground glass reduces the noise in the image and still has a favorable effect on the resolution.Subsequent experimental results also confirmed this conclusion.Therefore,we can confirm that the multipath effect has a positive impact in the correlated imaging system.Finally,the effects of distance and object size on the multipath effect of the object light were evaluated.When the distance becomes larger,the advantages of ghost imaging using reflected light from the aluminized ground glass are highlighted.Compared with traditional ghost imaging,the resolution is greatly improved and the noise is still slightly increased.However,under high resolution,slightly higher noise can be eliminated by other algorithms.The slit width and the width between two slits were confirmed by the simulation results to have no significant effect on the multipath effect of the object light.Through the consideration of these two factors,we can predict that in the ghost imaging affected by the multipath effect of the object light,the appropriate distance,the large slit width and small two-slits-width can achieve the best imaging effect.