MRI-R2: Acquisition of a Scanning Laser Doppler Vibrometer System

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。本项目将获得一台扫描振动计，用于多学科研究项目。测振仪利用反射激光束的多普勒频移来测量非接触物体的振动。本课题将利用测振仪对超声辐射力激励技术进行研究；该技术利用两个超声波源之间的干扰，在不接触的情况下振动宏观和微观物体。该项目的另一个主要目标是使用扫描振动计进行音乐声学研究。为了产生它们的特征音调，乐器是复杂的系统，通常涉及非线性振荡器，耦合到复杂的谐振结构。该项目将使人们更彻底地了解这些乐器的工作原理。本科生将参与研究的各个方面。使用测振仪获得的测量结果将有助于更好地理解利用超声辐射力激励微悬臂梁的独特能力。这可能会影响依赖于微悬臂振动的领域，包括超灵敏的质量检测和原子力显微镜。由于学术研究人员和实际乐器制造者之间的密切合作，音乐声学研究将产生影响。本科生将有机会与知名研究人员合作，他们将通过Gustavus？网络声学实验室。学生和公众将受益于通过网络实验室或网络使用扫描式测振仪的声学和振荡课堂演示。研究结果将通过报告、出版物和网站广泛传播。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This project will acquire a scanning vibrometer for a multi-disciplinary research program. A vibrometer uses the Doppler shift of a reflected laser beam to measure the vibration of objects without contact. In this project, the vibrometer will be used to investigate the ultrasound radiation force excitation technique; this technique uses the interference between two ultrasound sources to vibrate macroscopic and microscopic objects without contact. The other major goal of the project is to use the scanning vibrometer for research in musical acoustics. To produce their characteristic tones, musical instruments are sophisticated systems that often involve nonlinear oscillators, coupled to complex resonant structures. The project will enable a more thorough understanding of how these musical instruments work. Undergraduate students will be involved in all aspects of the research. Measurements obtained using the vibrometer will lead to a better understanding of the unique capabilities available using ultrasound radiation force excitation of microcantilevers. This may impact areas that rely on the vibration of microcantilevers, including ultras-sensitive mass detection and atomic force microscopy. The musical acoustic studies will have an impact because of the close collaboration between academic researchers and actual instrument builders. Undergraduate students will have the opportunity to collaborate with well-known researchers who will have remote access to the scanning vibrometer through Gustavus? cyber-enabled acoustics lab. Students and the general public will benefit from classroom demonstrations in acoustics and oscillations that use the scanning vibrometer via the cyber-enabled lab or web. Results will be disseminated widely in presentations, publications, and via a web site.