Active Damping of Air-backed Ultrasonic Transducers Using Arbitrary Waveform Generators.
Active Damping of Air-backed Ultrasonic Transducers Using Arbitrary Waveform Generators.
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DOI：
10.1109/ius46767.2020.9251816
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Nussbaum, Zoe
中科院分区：
文献类型：
--
作者：
Yen, Jesse;Nussbaum, Zoe
高强度聚焦超声和声辐射力成像等超声技术需要先进或复杂的换能器设计。通常，这些设计具有宽功率范围、高灵敏度和宽带宽的换能器要求。然而，通常期望将相同的换能器用于两者。该概念验证研究的目的是证明使用空气支持的窄带换能器的主动阻尼来实现宽带能力的可行性。主动阻尼是通过使用任意波形发生器来消除超出初始激励的后续振荡来实现的。在Matlab中编写的修改的1-D KLM模型用于指导波形的设计。波形的优化应用于KLM模型使用最小化函数，最大限度地减少涟漪。在该模型中，-3 dB的传输带宽增加10%至44%为1.5个周期的激励和11.4%至63.8%为1个周期的激励。实验上也观察到带宽的相当增加。
Ultrasound technologies such as high-intensity focused ultrasound and acoustic radiation force imaging require advanced or sophisticated transducer designs. Oftentimes, these designs have transducer requirements of wide power ranges, high sensitivity, and broad bandwidth. However, it would often times be desirable to use the same transducer for both. The objective of this proof-of-concept study is to demonstrate the feasibility of using active damping of air-backed, narrowband transducers to achieve broadband capability. Active damping is accomplished through the use of arbitrary waveform generators to cancel subsequent oscillations beyond the initial excitation. A modified 1-D KLM model written in Matlab is used to guide the design of the waveforms. Optimization of the waveforms is applied to the KLM model using minimization function that minimizes ripple. In the model, - 3 dB transmitted bandwidth increased from 10% to 44% for 1.5-cycle excitation and 11.4% to 63.8% for 1-cycle excitation. Comparable increases in bandwidth were also observed experimentally.
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