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.

超声成像是一项重要的技术，用于医学诊断和各种工业应用的损伤检测。在大多数传统的超声成像系统中，脉冲是从超声换能器发出的，并且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，代替传统的换能器，一个基于激光的系统将被用来测量超声波。这是一种潜在的变革性方法，与传统方法相比，它可能具有独特的优势，包括减少测量误差，以及创建行波前全景视频的能力。该项目将解决使基于激光的超声波测量能够用于工业应用和生物医学研究所需的基本挑战。一项强有力的推广工作将使用声学领域的测量视频来激发中学生对科学和工程的兴趣。这些视频将允许学生参与诸如超声波成像如何工作，为什么打桩产生的冲击波会对建筑工地附近的海洋生物造成影响，以及海洋中的分层如何用于军事和海洋哺乳动物的远程通信。为了在光学上探测超声波，激光干涉仪的测量臂被指向一个静止的反反射表面。当声波通过测量激光束时，波？S密度变化产生的相移可以被干涉仪检测到。该项目预计将产生广泛的成果。超声场的干涉测量通常使用商用激光多普勒测振仪进行。然而，测振仪是用来测量振动表面的；它们不适合测量声场。该项目将研究实现开源声学干涉测量探测器的设计，使其他研究人员能够构建一个优化的超声场干涉测量系统。一个重要的成果将是一个方案，主动监测和控制超声驻波的形成。这将产生超声辐射力激发所施加的力的两倍。其他结果将使多个测量结合起来，以获得比以前研究中获得的更高频率的高保真度和深度敏感干涉测量。当用传统换能器测量超声波时，这些单点和全场测量将不容易受到观察到的一些伪影的影响。超声场的干涉测量将用于研究当波脉冲穿过物体时导致马赫激波形成的流体/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.