Geophysics Group EES-17, MS D446, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
J Acoust Soc Am. 2013 Jul;134(1):EL52-6. doi: 10.1121/1.4809773.
This paper describes the principle behind a high amplitude non-contact acoustic source based on the principle of time reversal (TR), a process to focus energy at a point in space. By doing the TR in an air filled, hollow cavity and using a laser vibrometer in the calibration of the system, a non-contact source may be created. This source is proven to be more energetic than an off the shelf focused ultrasound transducer. A scaled up version of the proposed source has the potential to allow nondestructive evaluation processes that require high amplitude, such as nonlinear elastic wave spectroscopy (NEWS) techniques.
本文介绍了一种基于时间反转（TR）原理的高振幅非接触声源的原理，该原理是一种将能量聚焦在空间中某一点的过程。通过在充满空气的中空腔中进行 TR，并在系统校准中使用激光测振仪，可以创建一个非接触式声源。事实证明，这种声源比市售的聚焦超声换能器更具能量。所提出的声源的放大版本有可能允许需要高振幅的无损评估过程，例如非线性弹性波光谱（NEWS）技术。
