RUI: Detection of Ultrasound Waves in Water and Air using a Laser Interferometer

RUI：使用激光干涉仪检测水和空气中的超声波

• 批准号: 1635456
• 负责人: Thomas Huber
• 金额: $ 20万
• 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: 2016
• 资助国家: 美国
• 起止时间: 2016-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1635456&HistoricalAwards=false
• 关键词: RUI; Detection; Ultrasound; Waves; Water

Ultrasound imaging is an important technique utilized for medical diagnosis and damage detection in a variety of industrial applications. In most conventional ultrasound imaging systems, a pulse is emitted from an ultrasonic transducer, and transmitted or reflected ultrasound pulses are measured with a similar transducer. In this project, instead of using a conventional transducer, a laser-based system will be utilized to measure the ultrasound. This is a potentially transformative method that may have unique advantages relative to conventional methods, including reduction of measurement errors, and the ability to create full-field videos of traveling wavefronts. The project will address the fundamental challenges needed to enable laser-based ultrasonic measurements to be utilized for industrial applications and biomedical research. A strong outreach effort will use measured videos of acoustics fields to motivate secondary students to become interested in science and engineering. These videos will allow students to engage in topics such as how ultrasound imaging works, why shock waves produced by pile driving are of concern for marine life near construction sites, and how layering in the ocean is used for long-range communication by both the military and marine mammals.To detect ultrasonic waves optically, the measurement arm of a laser interferometer is directed at a stationary retroreflective surface. When an acoustic wave passes through the measurement laser beam, the wave?s density variations produce phase shifts that can be detected by the interferometer. This project anticipates a wide range of outcomes. Interferometric measurements of ultrasonic fields have often been performed using a commercial laser Doppler vibrometer. However, vibrometers are engineered to measure vibrating surfaces; they are not optimized for measuring acoustic fields. The project will investigate designs for implementing an Open Source Acoustic Interferometric Detector to enable other researchers to construct a system optimized for interferometric measurements of ultrasound fields. An important outcome will be a protocol to actively monitor and control ultrasonic standing wave formation. This will produce a doubling of the force applied by ultrasound radiation force excitation. Other outcomes will enable multiple measurements to be combined to obtain high-fidelity and depth-sensitive interferometric measurements at higher frequencies than have been obtained in previous studies. These single-point and full-field measurements will not be susceptible to some of the artifacts observed when ultrasound is measured with conventional transducers. Interferometric measurements of ultrasonic fields will be used to investigate the fluid/structure interactions that lead to Mach shock formation when a wave pulse passes through an object.

超声成像是在各种工业应用中用于医学诊断和损害检测的重要技术。在大多数常规的超声成像系统中，从超声传感器发出脉冲，并用类似的换能器测量传输或反射的超声脉冲。在这个项目中，将利用基于激光的系统来测量超声检查。这是一种潜在的变换方法，相对于常规方法，可能具有独特的优势，包括减少测量误差以及创建行进波前视频的能力。该项目将解决使基于激光的超声测量可用于工业应用和生物医学研究所需的基本挑战。一项强大的外展工作将使用测量的声学领域的视频，以激励二级学生对科学和工程感兴趣。这些视频将使学生能够参与诸如超声成像的工作原理，为什么堆驾驶产生的冲击波在建筑工地附近引起海洋生物的关注，以及海洋中的分层如何用于军事和海洋哺乳动物的远距离通信。当声波通过测量激光束时，波的密度变化会产生可通过干涉仪检测到的相移。该项目预计会有广泛的结果。经常使用商业激光多普勒振动仪进行超声场的干涉测量。但是，振动仪经过设计以测量振动表面；它们未针对测量声场进行优化。该项目将调查用于实施开源声学干涉探测器的设计，以使其他研究人员能够构建用于优化超声磁场的干涉测量的系统。一个重要的结果将是积极监测和控制超声波立场形成的方案。这将产生通过超声辐射力激发施加的力加倍。其他结果将使多个测量值合并，以比以前的研究获得的高频率和深度敏感的干涉测量值。这些单点和全场测量不容易受到用常规传感器测量超声时观察到的某些伪影。超声波场的干涉测量将用于研究当波脉冲通过对象时导致马赫冲击形成的流体/结构相互作用。

项目成果

Optical imaging of propagating Mach cones in water using refracto-vibrometry

使用折射振动测量法对水中传播马赫锥进行光学成像

• DOI: 10.1121/1.4977099
• 发表时间: 2017
• 期刊: The Journal of the Acoustical Society of America
• 作者: Huber, Nathan R.;Huber, Thomas M.;Huber, Matthew T.
• 通讯作者: Huber, Matthew T.