Terahertz acoustic phase imaging

最近，我们在慕尼黑大学的小组开发了一种用太赫兹（THz）辐射探测隐藏物体的新技术。在我们的方法中，我们使用太赫兹辐射来检测物体在进行微小振动时的声学相位。这项技术对几乎所有的材料都很敏感，包括金属和电介质，甚至有机材料。诸如所需的振动幅度或太赫兹辐射暴露等基本参数比人体暴露的推荐值低许多数量级，这使得该技术在人员筛选方面的应用极具吸引力。未来的研究应该提供：i)在物体上的演示，与现实生活中的情况相媲美；ii)在应用方面对技术进行表征。然而，慕尼黑团队既没有扫描合理尺寸物体的设备，也没有处理安全相关问题的经验。提议的x - c组之间合作的目标。Rensselaer的Zhang和慕尼黑的R. Kersting将向面向应用的研究迈出第一步。这次为期三周的伦斯勒之旅的目的是了解伦斯勒的实验能力，以及如何通过在两个团队之间分配不同的挑战来实现研究目标。将根据这一结果拟订一项联合提案。

Recently, our group at the University of Munich developed a novel technique for detecting concealed objects with terahertz (THz) radiation. In our approach, we use THz radiation for detecting the acoustic phase of the objects while they perform a minute vibration. The technique is sensitive to virtually all materials, metals as well as dielectrics, and even organic materials. Fundamental parameters, such as the required vibration amplitude or the exposure to THz radiation are many orders below those values recommended for the exposure to humans, which makes the technique extremely attractive for applications in personnel screening. Future research should deliver: i) A demonstration on objects, which are comparable to real life situations and ii) the characterization of the technique with respect to applications. However, the Munich team has neither the equipment for scanning objects of reasonable size nor the experience with security related issues. The goal of the proposed collaboration between the groups of X.-C. Zhang at Rensselaer and of R. Kersting at Munich is to perform the first steps towards application oriented research. The intention of the three week travel to Rensselaer is to find out about the experimental capabilities at Rensselaer and how the research goals can be met by distributing the different challenges between both teams. Based on this outcome a joint proposal will be developed.