Elliptic Laboratories, Sandakerveien 24c, N-0473 Oslo, Norway.
School of Mechanical Engineering, University of Valle, Ciudad Universitaria Meléndez, Cali, Colombia.
Ultrasonics. 2014 Sep;54(7):1912-21. doi: 10.1016/j.ultras.2014.04.008. Epub 2014 May 15.
Airborne ultrasound is a rapidly developing subfield within human-computer interaction (HCI). Touchless ultrasonic interfaces and pen tracking systems are part of recent trends in HCI and are gaining industry momentum. This paper aims to provide the background and overview necessary to understand the capabilities of ultrasound and its potential future in human-computer interaction. The latest developments on the ultrasound transducer side are presented, focusing on capacitive micro-machined ultrasonic transducers, or CMUTs. Their introduction is an important step toward providing real, low-cost multi-sensor array and beam-forming options. We also provide a unified mathematical framework for understanding and analyzing algorithms used for ultrasound detection and tracking for some of the most relevant applications.
空气传播超声是人机交互（HCI）领域中一个快速发展的分支。非接触式超声接口和笔跟踪系统是 HCI 近期趋势的一部分，正在获得行业动力。本文旨在提供理解超声的能力及其在人机交互中的潜在未来所需的背景和概述。介绍了超声换能器方面的最新进展，重点介绍了电容式微机械超声换能器（CMUT）。它们的引入是朝着提供真正的、低成本的多传感器阵列和波束形成选项迈出的重要一步。我们还为理解和分析一些最相关应用中用于超声检测和跟踪的算法提供了一个统一的数学框架。
