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 (RELPH) 是一种用于显示具有任意强度和相位分布的 3D 场景的概念。它不仅在显示水平、垂直和运动视差方面优于其他3D显示方法，同时不存在调节-会聚冲突，而且在不产生直流项和孪生图像方面也优于传统全息术。该技术基于两个准直波的干涉，这两个准直波由两个硅基液晶 (LCOS) 型空间光调制器 (SLM) 进行相位调制。尽管目前市场上仍然没有提供具有足够高空间带宽积的 SLM，但现在必须开发这种用于未来 3D 电视和 3D 电影的有前景方法的基础。在该项目的第一阶段，该技术的存在和独特性基础理论得到了证明，实验证实了该方法的可行性。显示示例 3D 场景的实验证明了 3D 特征的焦深、物体遮挡和视差。很明显，RELPH 需要两个 LCOS 进行精确的相互调整。对样本物体的实验提出了一种 LCOS 相互刚体调整的策略。但是，必须通过测量变形并向两个 LCOS 的相位分布添加校正相位分布来消除叠加到所需复杂波场上的剩余杂散干涉图案。在此处提出的项目的下一阶段中，这种校准已有待制定和实施。每个 LCOS 的变形必须通过外部干涉仪进行测量。这些测量的结果可以与相移测量的结果进行检查，相移测量产生两个错误相位分布的差异。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。将分析要显示的 3D 场景的数字全息捕获，目的是发现从全息数据中计算 RELPH 数据的简单快速的程序。为了获得更好的视觉效果，RELPH 产生的波场的光学放大率必须在计算过程中通过补偿横向和纵向的不同放大率来提高。嵌入到 RELPH 方法性能评估中的图像退化（如散斑）的抑制将得到研究和实施。