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.

无引用相位全息图（RERPH）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。它不仅优于其他3D显示方法在显示水平，垂直和运动视差的同时，在没有适应性连接冲突的同时，它也比传统的全息图更好，在不产生DC期和不产生双图像的情况下也更好。该技术基于两个准直的波的干扰，它们是由硅（LCOS）类型上液晶的两个空间光调节剂（SLM）调节的。尽管今天仍未在市场上提供足够高的太空产品的SLM，但现在必须开发这种有希望的未来3D电视和3D电影的基础。显示样品3D场景的实验证明了焦点，对象遮挡和视差的3D特征。很明显，Relph需要对两个LCO进行精确的相互调整。使用样品对象进行的实验提出了一种与LCO的刚性刚体调节的策略。但是，必须通过测量变形并将校正相分布添加到两个LCOS的相位分布中。每个LCO的变形必须通过外部干涉仪测量。这些测量结果可以根据相变测量的结果进行检查，从而产生两个错误的相分布的差异。将研究激光二极管的使用，它们在空间或时间上多发性颜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，以发现简单而快速的程序，以从全息数据中计算出Relph-Data。在计算过程中，在横向和纵向方向上的不同宏伟质量的补偿，必须改善Relph生成的波场的光学放大倍率。将嵌入RELPH方法的性能评估中，将研究和进行诸如Speckles之类的图像降解的抑制。