Wang Tiansi, Zhang Chong, Aleksov Aleksandar, Salama Islam, Kar Aravinda
CREOL, The College of Optics & Photonics, University of Central Florida, 4304 Scorpius Street, Orlando, FL 32816-2700, USA.
Intel - Assembly & Test Technology Development, 5000 W Chandler Blvd, Chandler, AZ 85226, USA.
Ultrasonics. 2017 Apr;76:35-43. doi: 10.1016/j.ultras.2016.12.005. Epub 2016 Dec 9.
Phased array ultrasonic transducers enable modulating the focal position of the acoustic waves, and this capability is utilized in many applications, such as medical imaging and non-destructive testing. This type of transducers also provides a mechanism to generate tilted wavefronts in acousto-optic deflectors to deflect laser beams for high precision advanced laser material processing. In this paper, a theoretical model is presented for the diffraction of ultrasonic waves emitted by several phased array transducers into an acousto-optic medium such as TeO crystal. A simple analytic expression is obtained for the distribution of the ultrasonic displacement field in the crystal. The model prediction is found to be in good agreement with the results of a numerical model that is based on a non-paraxial multi-Gaussian beam (NMGB) model.
相控阵超声换能器能够调制声波的焦点位置，这种能力在许多应用中都有使用，比如医学成像和无损检测。这种类型的换能器还提供了一种机制，可在声光偏转器中产生倾斜的波前，以偏转激光束用于高精度先进激光材料加工。本文提出了一个理论模型，用于描述由几个相控阵换能器发射的超声波在诸如TeO晶体等声光介质中的衍射。得到了晶体中超声位移场分布的一个简单解析表达式。发现该模型预测结果与基于非傍轴多高斯光束（NMGB）模型的数值模型结果吻合良好。
