Spectral Information Processing Based On Multi-wavelength Ghost Imaging Technology

Ghost imaging is a technology that uses the collected light intensity information to perform the corresponding correlation calculation to obtain the information of the object.The previous ghost imaging technology usually considers the recovery of the spatial information of the object,but ignores the spectral information of the object,so the study of the spectral characteristics of ghost imaging has become one of the hot research issue.Since what this paper discusses is the spectral image of the target object,the narrow-band filter is selected as the target object for verification experiments.In this part,the expressions of multiple broadband second-order correlation functions are discussed,and the spectral image for a specific wavelength is analyzed,and the image obtained by using the correlation function is optimized to improve the imaging quality of the wavelength image to be measured..Next,this paper further discusses the optimization of specific spectral images when the target object may have multiple characteristic spectral lines.It is found that the multi-wavelength ghost imaging system can simultaneously increase the intensity of spectral images of multiple specific wavelengths,which proves the feasibility of using the multi-wavelength ghost imaging system to improve the intensity of spectral images.In order to correspond the obtained spectral images to their wavelengths,this paper also calculates the image quality evaluation index to distinguish the obtained spectral images.To sum up,based on the multi-wavelength ghost imaging,this thesis studies the relationship between the higher-order correlation function and the second-order correlation function,and further optimizes the image obtained by using the correlation function,thereby improving the imaging quality.Sceond,according to the results of theoretical analysis,numerical simulation experiments are carried out,and it is found that the imaging quality of an image of a certain wavelength can be improved by using higher-order correlation functions.Finally,an experimental platform was built and verified by experiments.It was found that the use of the experimental system of multi-wavelength ghost imaging can improve the spectral images of some specific spectral line intensities.