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Referenceless phase holography for reconstruction of complete optical wave fields for metrology and displays II (RELPH II)

用于计量和显示完整光波场重建的无参考相位全息术 II (RELPH II)

基本信息

批准号：
250959575
负责人：
Professor Dr. Ralf Bernhard Bergmann
金额：
--
依托单位：
BIAS - Bremer Institut für Angewandte Strahltechnik GmbH
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/250959575?language=en
关键词：
Referenceless phase holography reconstruction complete

项目摘要

Referenceless phase holography (RELPH) is a concept for displaying 3D scenes with arbitrary intensity and phase distributions. It is not only superior to other 3D display methods in showing horizontal, vertical, and motion parallax while exhibiting no accommodation-convergence conflict, but also is better than conventional holography in producing no dc-term and no twin images. The technique is based on the interference of two collimated waves which are phase modulated by two spatial light modulators (SLM) of liquid crystal on silicon (LCOS) type. Although today still no SLMs with a space-bandwidth-product high enough are offered on market, the foundations of this promising method for future 3D TV and 3D movies have to be developed now.In the first phase of the project existence and uniqueness of the underlying theory has been proven and the feasibility of the method was confirmed experimentally. Experiments displaying sample 3D scenes proved the 3D features depth of focus, object occlusion, and parallax. It has become obvious that RELPH requires an exact mutual adjustment of the two LCOS. Experiments with a sample object suggested a strategy for mutual rigid body adjustment of the LCOS. But a remaining spurious interference pattern superposed to the desired complex wave field has to be eliminated by measuring the deformations and adding correcting phase distributions to the phase distributions of both LCOS.In the next phase of the project, which is proposed here, this calibration has to be developed and implemented. The deformation of each LCOS has to be measured by an external interferometer. The results of these measurements can be checked against the results of phase-shifting measurements, which yield the difference of the two erroneous phase distributions. The employment of laser diodes will be investigated, their combination in spatially or temporally multiplexed color display also will be an issue. The digital holographic capture of the 3D scenes to be displayed will be analyzed with the objective to discover easy and fast procedures to calculate the RELPH-data out of the holographic data. The optical magnification of the RELPH-generated wave fields for better vision has to be improved with compensation of the different magnifications in lateral and in longitudinal direction already in the calculation process. Embedded into a performance assessment of the RELPH method the suppression of image degradations like speckles will be investigated and carried out.

无参考相位全息是一种用于显示具有任意强度和相位分布的三维场景的概念。它不仅在显示水平、垂直和运动视差方面上级其他3D显示方法，同时不表现出视差-会聚冲突，而且在产生无DC项和无孪生图像方面优于传统全息术。该技术是基于两个平行的波，这是相位调制的两个空间光调制器（SLM）的硅上液晶（LCOS）类型的干涉。虽然目前市场上还没有空间带宽积足够高的SLM，但这种有前途的方法用于未来3D电视和3D电影的基础必须现在就开发。在项目的第一阶段，基本理论的存在性和唯一性已经得到证明，并且该方法的可行性得到了实验证实。实验显示样本3D场景证明了3D功能的焦深，对象遮挡，视差。很明显，CIPPH需要两个LCOS的精确相互调节。通过对一个样品的实验，提出了一种LCOS的相互刚体调整策略。但是，必须通过测量变形并将校正相位分布添加到两个LCOS的相位分布中来消除叠加到所需复杂波场的剩余伪干涉图案。在这里提出的项目的下一阶段中，必须开发和实施这种校准。每个LCOS的变形必须由外部干涉仪测量。这些测量的结果可以对照相移测量的结果进行检查，相移测量的结果产生两个错误相位分布的差。将研究激光二极管的使用，它们在空间或时间复用彩色显示中的组合也将是一个问题。将要显示的3D场景的数字全息捕获将被分析，目的是发现从全息数据中计算全息数据的简单快速的程序。为了更好的视觉，必须通过在计算过程中已经在横向和纵向方向上的不同放大率的补偿来提高由光波导产生的波场的光学放大率。嵌入到一个性能评估的CNOPH方法的抑制图像退化，如斑点将进行调查和进行。