基于迈克尔逊干涉仪的非相干同轴数字全息成像系统研究

发布时间：2018-04-16 00:12

本文选题：全息 + 非相干全息　；参考：《郑州大学》2016年硕士论文

【摘要】：全息成像技术可以记录物光场的振幅与相位分布,在很多领域有着广泛的应用。非相干全息术使用非相干光源,克服了激光全息术相干散斑噪声严重,对系统装置稳定性要求较高的缺点,拓展了全息成像技术的应用范围。本论文主要探讨基于迈克尔逊干涉仪的非相干同轴数字全息成像系统。本文首先介绍了非相干光全息成像技术的发展历程与研究现状,然后详细介绍了非相干光全息成像技术的基本原理,并对几种典型的非相干光全息成像系统进行了分析。以基于迈克尔逊干涉仪的非相干光全息成像系统为例,探讨了该系统点扩散函数的计算方法,全息图的记录原理,数值再现算法,孪生像与零级项的消除方法等内容。研究了广义相移数字全息干涉术(GPSI)的基本原理,探讨了基于衍射光相位场统计特性的相移量盲取算法在非相干光全息成像系统中的应用,结合三步GPSI算法与四步GPSI算法推导了物光场再现公式。搭建了一种基于迈克尔逊干涉仪的非相干同轴数字全息成像系统,并对分辨率板、钢尺进行了成像实验研究,实验结果表明:此系统可以实现全息图的快速记录与再现,三步GPSI算法与四步GPSI算法应用于此系统可以成功消除孪生像与零级项,获得清晰的重建像。对标准分辨率板的实验表明,在横向放大率为1.6倍时,系统的横向分辨率可达45lp/mm。在此基础上,搭建了一种基于迈克尔逊干涉仪的非相干同轴数字全息望远成像系统,并成功对两组反射式物体进行了望远成像实验。利用重建图像的对比度作为判断函数,对系统的自动聚焦特性及相移误差校正算法进行了研究,实验发现,此判断函数仅适用于噪声较低的平面物体的数字自动聚焦与相移误差校正,在所拍摄物体为立体结构或重建图像噪声较高时,这种自动聚焦方法不适用。
[Abstract]:Holographic imaging technology can record the amplitude and phase distribution of light field, and has been widely used in many fields.Incoherent holography uses incoherent light sources, which overcomes the serious speckle noise of laser holography and requires high stability of system devices, and expands the application scope of holographic imaging technology.This paper mainly discusses the noncoherent coaxial digital holographic imaging system based on Michelson interferometer.This paper first introduces the development and research status of incoherent optical holographic imaging technology, then introduces the basic principle of incoherent optical holographic imaging technology in detail, and analyzes several typical incoherent optical holographic imaging systems.Taking the incoherent optical holographic imaging system based on Michelson interferometer as an example, the calculation method of the point diffusion function, the recording principle of the hologram, the algorithm of numerical reconstruction, the elimination of the twin image and the zero term are discussed.The basic principle of generalized phase-shifted digital holographic interferometry (GPSI) is studied. The application of phase shift blind algorithm based on the statistical characteristics of phase field of diffractive light in incoherent optical holographic imaging system is discussed.Combining three-step GPSI algorithm and four-step GPSI algorithm, the reproducing formula of object light field is derived.A noncoherent coaxial digital holographic imaging system based on Michelson interferometer is set up. The imaging experiments of the resolution plate and the steel ruler are carried out. The experimental results show that the system can record and reproduce the hologram quickly.The application of three-step GPSI algorithm and four-step GPSI algorithm to this system can successfully eliminate the twinning image and zero order term and obtain the clear reconstructed image.The experimental results of the standard resolution plate show that the lateral resolution of the system can reach 45lp / mmm when the transverse magnification is 1.6 times.On this basis, a noncoherent coaxial digital holographic imaging system based on Michelson interferometer is built, and two sets of imaging experiments are successfully carried out.Based on the contrast of reconstructed image as a judgment function, the auto-focusing characteristics and phase-shift error correction algorithm of the system are studied, and the experimental results show that,This judgment function is only suitable for digital autofocus and phase shift error correction of planar objects with low noise. This method is not applicable when the object is stereo structure or the reconstructed image is noisy.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH744.3;O438.1

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