Next-Generation Imaging Technique for Underground Object Detection

用于地下物体检测的下一代成像技术

• 批准号: 0324348
• 负责人: Bojan Guzina
• 金额: --
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0324348&HistoricalAwards=false
• 关键词: Next; Generation; Imaging; Technique; Underground

The aim of this project is to develop an advanced computational and experimental basis for expedient 3D imaging of subterranean objects using elastic (i.e. seismic) waves. In contrast to existing three-dimensional seismic analyses that require full volume discretization of the underground domain, the proposed imaging technology revolves around an elastodynamic Boundary Integral Equation (BIE) method so that only the outline of a hidden object is rendered. This boundary-only sensing approach, which offers formidable computational savings, has its origins in radar and sonar technologies, but has been largely unexplored in the context of seismic surveys. Aimed at bridging such gap, the first stage of this research is focused on elevating the prototype BIE imaging technique as to increase its robustness, account for a wider class of subterranean conditions, and deal with the detrimental effects of experimental and modeling errors. The experimental phase of this project aims to implement the new sensing technology into a compact testing setup that involves a vibratory seismic source and a surface array of triaxial motion sensors. The research efforts include 1) generalization of the recent findings in acoustics and structural shape optimization to develop a rapid ground-probing technique and thus furnish a reliable initial guess required for the high-fidelity BIE imaging; 2) extensions of the method to deal with noise-polluted measurements and multi-layered geological deposits; 3) synthesis of the computational developments for a robust, yet expedient approach to 3D seismic sensing; 4) small-scale implementation of the method to identify obstacles buried in a sand bin, and 5) a field effort aimed at imaging an existing, on-campus underground facility. The foregoing research program will be complemented with a continuing effort to foster the growing use of non-destructive testing in civil engineering. Potential applications of the new sensing technology include rapid detection of underground facilities and unexploded ordnances; cost-effective mapping of subterranean infrastructure in urban areas, and non-invasive delineation of buried waste. The need for fast and economic 3D seismic imaging in these and other areas is especially pronounced in situations where electromagnetic surveys may be inadequate due to their limited resolution and depth of penetration

该项目的目的是开发一个先进的计算和实验基础，方便的三维成像的地下物体使用弹性（即地震）波。与需要地下域的全体积离散化的现有三维地震分析相反，所提出的成像技术围绕弹性动力学边界积分方程（BIE）方法，使得仅呈现隐藏对象的轮廓。这种仅边界感测方法提供了强大的计算节省，其起源于雷达和声纳技术，但在地震勘测的背景下基本上未被探索。为了弥合这种差距，本研究的第一阶段的重点是提升原型BIE成像技术，以增加其鲁棒性，占更广泛的地下条件，并处理实验和建模误差的不利影响。该项目的实验阶段旨在将新的传感技术应用到一个紧凑的测试装置中，该装置包括一个振动震源和一个三轴运动传感器表面阵列。研究工作包括：1）推广声学和结构形状优化方面的最新研究成果，发展快速地面探测技术，从而为高保真BIE成像提供可靠的初始猜测：2）将该方法扩展到处理噪声污染测量和多层地质沉积; 3）为3D地震感测的鲁棒而又方便的方法的计算发展的综合; 4）小规模实施该方法以识别埋在砂箱中的障碍物，以及5）旨在对现有的，校园地下设施上述研究计划将得到补充，继续努力促进非破坏性测试在土木工程中的越来越多的使用。新的传感技术的潜在应用包括快速探测地下设施和未爆弹药;对城市地区地下基础设施进行成本效益高的测绘，以及对掩埋废物进行非侵入性的划定。在这些和其他区域中对快速和经济的3D地震成像的需要在电磁勘测由于其有限的分辨率和穿透深度而可能不充分的情况下尤其显著