| Ghost imaging is an imaging technology that uses the intensity fluctuation of light field to recover the information of the object.Compared with traditional imaging technology,the superiority of ghost imaging makes its application prospect very widely,but its imaging quality is one of the important factors to affect the practical application.In ghost imaging system,the quality of light source is an important factor that affects the quality of ghost imaging.In this thesis,the theoretical and experimental studies are made about the three aspects: the transverse space fluctuation of the light field,the statistical property of the space(the intensity of each pixel in the speckle)and the first order statistical properties of the time(the change of a pixel in the speckle with time in the speckle).First,the spatial and temporal statistical properties of pseudo thermal light field are theoretically discussed.Then,we designed a ghost imaging scheme which takes the projector as the light source.And we used the computer to generate the different speckle with different qualities of transverse space fluctuation,the statistical properties of the space and the first order statistical properties of the time.Finally,the influence of the three qualities on the image quality of ghost imaging is verified through simulation and experiment.Besides,the change of statistical properties of speckle field after free propagation in space is also discussed.Numerical simulations are carried out to analyze the influence of the speckle field on ghost imaging quality. |
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