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Research on real-time optical parallel processing using zone plate array and high resolution liquid crystal SLM

利用波带片阵列和高分辨率液晶SLM的实时光学并行处理研究

基本信息

批准号：
06650058
负责人：
KODATE Kashiko
金额：
$ 1.22万
依托单位：
Japan Women's University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

In this research, we have been investigated for real-time optical processing using the zone plate array and high resolution LCTV-SLM.We found the following main results :1) Examination of binary optical elements :A zone plate is an suitable device for parallel processing systems, because of its plane structure and flexibility in design. The sufficient efficiency of zone plate used for optical processing can be improved by increasing the number of phase level. The design method and fabrication techniques of multi-level zoneplate array based on diffractive optics were discussed. Computer simulation was done providing the predictions of focusing efficiencies, spotsize and the intensity profile at the focal plane. The experimental performance of focusing efficiency of 85% was achieved. These multi-level zone plate provided a well defined correlation peak and good performance provided same as by the Fourier ttransform lens. Using these method, we fabricated 3-level array illuminator for lar … More ge apearture phase-only spatial light modulators.2) Characteristics of LCTV-SLMs :The device limitations of the LCSLM was decisive factors in the performance of a optical processing. In order to understand te effects caused by limited resolution, theoretical and eventual design of the system was attempted.3) Real-time optical parallel processing based on JTC :A high-resolution LCTV-SLM and a binary zone plate were applied to optical parallel processing. Then, the real-time optical correlators was constracted. The possibility of recognition by pattern matching of front facial images and improvement of optical operation by introducing the digital pre-processing was discussed. Good correspondence of experimental and theoretical cross-correlation results were obtained. We designed and fabricated a binary zone plate array with 5 channels and obtained parallel cross-correlation signals of front facial images.In terms of performsnce speed, at present, we recognize the device resolution and operation speed are still low. However, we are optimistic that in the next 5 years these problems will be solved with the fabrication of optimized suited for purposes in optical processing. Less

在本研究中，我们研究了利用带板阵列和高分辨率lcd - slm进行实时光学处理。我们发现了以下主要结果：1)二元光学元件的检测：带片由于其平面结构和设计的灵活性，是一种适合并行处理系统的器件。通过增加相位电平的数目，可以提高带片光学加工的充分效率。讨论了基于衍射光学的多层带板阵列的设计方法和制作技术。计算机模拟给出了聚焦效率、光斑大小和焦平面强度分布的预测结果。实验结果表明，聚焦效率可达85%。多层带片具有清晰的相关峰，具有与傅里叶变换透镜相同的良好性能。利用这种方法，我们制作了用于大孔径纯相位空间光调制器的三能级阵列照明器。2) lctv - slm的特点：LCSLM的器件限制是影响光学处理性能的决定性因素。为了了解有限分辨率造成的影响，对系统的理论和最终设计进行了尝试。3)基于JTC的实时光学并行处理：采用高分辨率LCTV-SLM和二元带片进行光学并行处理。然后，构造实时光学相关器。讨论了人脸正面图像模式匹配识别的可能性以及引入数字预处理对光学操作的改进。实验结果与理论互相关结果吻合良好。设计并制作了5通道二元带板阵列，获得了正面人脸图像的并行互相关信号。在性能速度方面，目前我们认可的设备分辨率和运行速度仍然较低。然而，我们乐观地认为，在未来5年内，这些问题将得到解决，制造出适合光学处理目的的优化材料。少