Propagation, Focusing and Imaging in Complex Media

复杂媒体中的传播、聚焦和成像

• 批准号: 0908535
• 负责人: Albert Fannjiang
• 金额: $ 19.5万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908535&HistoricalAwards=false
• 关键词: Propagation; Focusing; Imaging; Complex; Media

This project covers three areas related to multiply scattered waves: coherence propagation, focusing, and imaging in cluttered media. Firstly, a comprehensive and rigorous framework is formulated to analyze the space-frequency coherence properties of waves in random media. Secondly, the multiply scattered evanescent waves will be taken into account to enhance the wave focusing in cluttered media. Thirdly, imaging methods based on the compressed sensing techniques will be developed to achieve stable, accurate imaging of multiple targets in clutter with nearly minimal sensing resources. Multiple scattering is a basic phenomenon in wave physics. It affects how signals and information are transferred in clutter prevalent in both natural and urban environments. In addition to fundamental research in wave physics, the main applications of the project are in remote sensing and near-field imaging. In particular, the project on detecting intruders hidden in clutter is important for homeland security and tissue imaging. The project on imaging in the background of rough surfaces will have impacts on aerial sensing of natural resources and targets in the terrestrial environment, as well as design of nanophotonic sensors for detecting biological and chemical agents.

这个项目涵盖了三个领域相关的多重散射波：相干传播，聚焦，并在杂乱介质中成像。首先，建立了一个全面而严格的框架来分析随机介质中波的空频相干特性。其次，考虑多次散射的倏逝波，以增强杂波介质中的波聚焦。第三，将发展基于压缩感知技术的成像方法，以实现在杂波中以几乎最少的传感资源对多个目标的稳定、准确成像。多次散射是波动物理中的一种基本现象。它会影响信号和信息在自然和城市环境中普遍存在的杂波中的传输方式。除了波动物理学的基础研究外，该项目的主要应用是遥感和近场成像。特别是，检测隐藏在杂波中的入侵者的项目对于国土安全和组织成像非常重要。关于在粗糙表面背景下成像的项目将对陆地环境中自然资源和目标的航空遥感以及用于探测生物和化学剂的纳米光子传感器的设计产生影响。