Synthetic Aperture Incoherent Digital Holography And Imaging Characteristics

Traditional holography has high requirements on the coherence of light sources,and is prone to coherent speckle noise.Incoherent optical holography based on spatial light modulators uses spatial incoherent light to illuminate objects to record three-dimensional holograms of objects,which overcomes This shortcoming avoids the rigorous experimental requirements of traditional optical holography,and the high quality of the reconstructed image has extremely high research value and practical application value.In this paper,based on the research of the characteristics of incoherent digital holographic imaging system,synthetic aperture technology is applied to this field.Through simulation and experimental exploration,the characteristics of incoherent digital holographic imaging system based on synthetic aperture are analyzed.Synthetic aperture digital holography technology can not only significantly increase the resolution and signal-to-noise ratio of the reconstructed image,but also can obtain a larger field of view and a longer record distance without greatly increasing the difficulty and complexity of a single imaging system.Firstly,based on the basic theory of Fresnel's incoherent digital holography recording and reconstruction,a incoherent digital holographic imaging system based on synthetic aperture technology is established.Through a large number of simulations and experiments on holographic recording and digital reproduction of resolution plates.Optimize the system structure and experimental parameters,then theoretically analyze and calculate the incoherent digital holographic imaging process based on synthetic aperture technology,and obtain a high-quality reconstruction image,and verify the synthetic aperture technology in incoherent digital holography.The feasibility of the field.Finally,experiments show that the lens array mask can be added to the spatial light modulator to increase the field of view of the reconstructed image,and a large-field-of-field high-resolution incoherent digital holographic imaging system based on a spatial light modulator is proposed.In detail,the research tasks completed in this paper include the following four aspects:In the first chapter,we mainly discuss that development process of incoherent digital holography is briefly described.The research background,research significance and domestic and international development of incoherent digital holography based on synthetic aperture technology are introduced in detail.The advantages and actual application values of this technology are summarized.The second chapter,we mainly introduce that theoretically analyze the recording and reconstruction process of incoherent light illumination digital holography system,build a incoherent digital holographic imaging system,verify the imaging characteristics of the system experimentally,and discuss the influence of different ratios of object light wave and reference light wave on the imaging quality.The third chapter,we mainly introduce that based on the recording and reproduction of incoherent digital holographic imaging system,the imaging process of incoherent digital holography based on synthetic aperture technology is theoretically analyzed and calculated.The effects of the sub-aperture mask loading method,the central sub-aperture mask and the sub-hologram reconstruction processing method on the spatial aperture of the synthetic aperture incoherent digital holography system are simulated and simulated.Then build a incoherent digital holographic optical path based on the synthetic aperture technology to realize the three-dimensional recording and reproduction of the resolution board.The simulation results are verified through a large number of experiments.The results further illustrate the synthetic aperture technology in incoherent digital holography.Applicability enriches the field of incoherent digital holography and provides a theoretical basis for its further development.The fourth chapter,we propose a high-resolution and large field of view incoherent digital holographic imaging system and method based on SLM.This method uses the phase-only mode of the spatial light modulator to increase the field of view of the system by loading a lens array mask to improve imaging.The field provided new ideas,and experimentally verified the influence of lens array masks on the imaging field of view.