Research On Application Of Computational Ghost Imaging

Ghost imaging is an amazing technique which exploits the quantum nature of light and has attracted much attention.Ghost imaging utilizes two spatial correlated beams to retrieve image:the signal arm is collected by a so-called “bucket” detector after illuminating the target;the reference arm,which doesn't interact with the target,is measured with a spatial-resolution camera.Neither of the detectors alone can produce an image of object,but by correlating the measurements of the two detectors,the object will appear.Compared to traditional optical imaging,ghost imaging has a series of advantages,such as inherently insensitive to distortion,high resolution,single pixel imaging and so on.In recent years,the focus of ghost imaging has shifted from fundamental research to its applications.Ghost imaging has been applied to weak signal imaging,optical encryption,time domain imaging and so on.Computational ghost imaging can be performed with a only bucket detector,which is convenient for application.In this paper,we research on the application of computational ghost imaging.Based on the single photon detection,we realize three-dimensional computational ghost imaging and polarization ghost imaging in weak illumination.Nevertheless,we research the compressive ghost imaging and proposed a scheme to apply computational ghost imaging to optical wireless communication.Innovative results include the following aspects:1.We propose single photon counting polarization ghost imaging.With time-correlated single-photon-counting technique,we realize discrimination of the object from the background of different material in weak illumination.In the situation that ambient noise is significantly stronger than the signal,our method still can retrieve image as long as we can acquire the intensity fluctuations.2.Base on single photon detection,we realize the three-dimensional ghost imaging for the target at 1km range.With the laser ranging,we proposed our three-dimensional ghost imaging scheme and establish the imaging system to imaging the target at 1km range.3.We research the compressive ghost imaging.We perform simulation experiment to analysis the influence of measurement matrix's sparseness on ghost imaging.Compared to traditional ghost imaging algorithms,compressive sensing algorithm can reconstruct a more clear image with a few measurements.4.We propose optical wireless communication based on computational ghost imaging.We perform the experiment to realize the scheme.Our scheme is insensitive to distortion and can reduce the effect of scattering medium.