检索结果-南通市图书馆

Integrating multiple images in a sampled phase-only hologram

Chinese Optics Letters 2019年第5期17卷 11-14页

作者： P. W. M. Tsang T.-C. Poon W. Wang X. Zhu K. Chan Department of Electronic Engineering City University of Hong KongHong Kong SARChina Bradley Department of Electrical and Computer Engineering Virginia TechBlacksburgVirginia 24061USA Hong Kong Applied Science and Technology Research Institute Company Limited Hong Kong SARChina

Past research has demonstrated that a sampled phase-only hologram (SPOH) is capable of representing an image without the magnitude component of the hologram. At present, an SPOH can only record and reconstruct a single source image. In this Letter, we propose, for the first time, to the best of our knowledge, a method for representing multiple images with a single integrated SPOH (ISPOH). Subsequently, each image can be retrieved from the ISPOH with a unique key parameter and displayed as a visible image on a phase-only spatial light modulator.

关键词： Integrating multiple images sampled phase-only hologram magnitude component

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimal design of a large dual-polarization microstrip reflectarray with China-coverage patterns for satellite communications

引用

Frontiers of Information Technology & Electronic Engineering 2020年第1期21卷 159-173页

作者： Gang ZHAO Yong-chang JIAO Guan-tao CHEN National Key Laboratory of Antennas and Microwave Technology Xidian UniversityXi’an 710071China

A large dual-polarization microstrip reflectarray with China-coverage patterns in two operating bands is *** sufficiently compensate for the spatial phase delay differences in two operating bands separately,a three-layer rectangular patch element is addressed,which is suitable for the large dual-polarization *** to the complexly shaped areas and high gain requirements,there are more than 25000 elements in the reflectarray,making it difficult to design,due to more than 150000 optimization ***,the discrete fast Fourier transform(DFFT)and the inverse DFFT are used to establish a one-to-one relationship between the aperture distribution and the far field,which lays a foundation for optimizing the shaped-beam *** intersection approach,based on the alternating projection,is used to obtain the desired reflection phases of all the elements at some sample frequencies,and a new method for producing a suitable initial solution is proposed to avoid undesired local *** validate the design method,a dual-polarization shaped-beam reflectarray with 7569 elements is fabricated and *** measurement results are in reasonable agreement with the simulation ***,for the large broadband reflectarray with the minimum differential spatial phase delays in the operating band,an approach for determining the optimal position of the feed is *** simultaneously find optimal dimensions of each element in two orthogonal directions,we establish a new optimization model,which is solved by the regular polyhedron ***,a dual-band dual-polarization microstrip reflectarray with 25305 elements is designed to cover the continent of *** results show that patterns of the reflectarray meet the China-coverage requirements in two operating bands,and that the proposed optimization method for designing large reflectarrays with complexly shaped patterns is reliable and efficient.

关键词： Reflectarray Dual-polarization Shaped beam phase-only synthesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

NEW APPLICATIONS OF CIRCULAR HARMONIC EXPANSION TO PATTERN RECOGNITION

引用

Chinese Science Bulletin 1989年第12期34卷 993-996页

作者：母国光尹世琢方志良 Institute of Modern Optics Nankai University Tianjin

Pattern recognition with a circular harmonic filter (CHF) can have both the shift and rotation invariancet but it suffers lower signal noise ratio (SNR) as compared with a matched spatial filter (MSF). In order to improve the SNR of CHF, here a new filter, phase-only circular harmonic filter (POCHF) is presented and the reason why POCHF can improve the SNR of correlation peak by the point

关键词： pattern recognition correlation operation phase-only circular harmonic filter optical information processing.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：