RUI: Excitation of Macro and Micro Cantilevers Using Ultrasound Radiation Force

RUI：使用超声波辐射力激发宏观和微观悬臂梁

• 批准号: 0900197
• 负责人: Thomas Huber
• 金额: $ 21.99万
• 依托单位: Gustavus Adolphus College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0900197&HistoricalAwards=false
• 关键词: RUI; Excitation; Macro; Micro; Cantilevers

The goal of this faculty-student project is a comprehensive study of excitation of vibrational modes of macro and micro cantilevers using the ultrasound radiation force. The ultrasound radiation force excitation method is a non-contact technique that relies on the interference between two or more ultrasound frequencies incident on an object. This interference produces a radiation force at the difference frequency, which can induce vibrations in the object. The ultrasound radiation force will be used to vibrate cantilevers spanning over two orders of magnitude in size and with resonance frequencies from less than 100 Hz to over 200 kHz. Of particular interest will be the study of a method whereby a pair of ultrasound transducers can selectively excite different vibrational modes, depending on whether the transducers are driven with the same phase or differing phases. A computational model of the ultrasound excitation process will be developed, both to better understand the underlying excitation mechanism, and also to facilitate future research. This project will result in a more fundamental understanding of the capabilities of ultrasound radiation force for noncontact excitation of macro and microcantilevers and similar objects.This project will have a broad impact, because of the important role that the vibration of microcantilevers plays in an ever increasing number of applications. By monitoring changes in the vibrational state of a microcantilever, it is possible to detect the minute change in mass when single cells, viruses or certain molecules attach to the microcantilever. Similarly, in the realm of materials science, researchers routinely use atomic force microscopy to study surfaces. These important techniques may benefit from the noncontact nature of the ultrasound radiation force. The capability of selective excitation of microcantilevers may enhance the sensitivity of these techniques as compared with conventional excitation methods.The undergraduate students involved in this project will get the extraordinary opportunity to perform cutting-edge on-campus research and also collaborate with well-known research groups at other institutions. The students will gain experience in a wide range of fields, including acoustics, optics, computer-controlled data acquisition, signal processing, modal analysis and computer modeling; this is valuable training for careers in either physics or engineering. They will also develop demonstrations to better communicate this research area to the public and to enhance Gustavus' well-established K-12 outreach programs.

这个师生项目的目标是全面研究利用超声波辐射力激发宏观和微观悬臂梁的振动模式。超声辐射力激励方法是一种非接触技术，它依赖于入射到物体上的两个或多个超声频率之间的干涉。这种干涉在不同的频率上产生辐射力，这可以在物体中诱导振动。超声波辐射力将用于振动大小超过两个数量级、共振频率从小于100赫兹到超过200千赫的悬臂。特别感兴趣的将是研究一种方法，其中一对超声换能器可以根据换能器是以相同的相位还是不同的相位来驱动而选择性地激发不同的振动模式。将开发超声激励过程的计算模型，以更好地了解潜在的激励机制，并为未来的研究提供便利。该项目将使人们对超声辐射力对宏、微悬臂梁及类似物体的非接触激励的能力有一个更基本的了解。由于微悬臂梁的振动在越来越多的应用中扮演着重要的角色，本项目将产生广泛的影响。通过监测微悬臂梁振动状态的变化，可以检测到单个细胞、病毒或某些分子附着在微悬臂梁上时质量的微小变化。同样，在材料科学领域，研究人员经常使用原子力显微镜来研究表面。这些重要的技术可能受益于超声辐射力的非接触性。与传统的激发方法相比，微悬臂梁的选择性激发能力可能会增强这些技术的灵敏度。参与该项目的本科生将获得非同寻常的机会，进行校园内的尖端研究，并与其他机构的知名研究小组合作。学生将在广泛的领域获得经验，包括声学、光学、计算机控制的数据采集、信号处理、模式分析和计算机建模；这是对物理或工程职业生涯的宝贵培训。他们还将开发演示，以便更好地向公众传达这一研究领域，并加强古斯塔夫斯完善的K-12外展计划。