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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Damping, amplitude, aging tests of stacked transducers for shock wave generation
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Damping, amplitude, aging tests of stacked transducers for shock wave generation

机译：堆叠式换能器产生冲击波的阻尼，振幅，老化测试

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摘要

New clinical concepts in lithotripsy demand small shock heads. Reducing the size of piezoelectric shock heads will be possible only if the pressure generated at the surface of each transducer can be increased so that the total pressure at the focus remains the same. To solve this problem, different solutions were proposed. For example, it has been demonstrated that piezocomposite material, as opposed to piezoceramic material, allows the generation of a higher surface pressure before breaking, mainly because radial modes are dramatically reduced. In addition, in a previous paper, we showed the feasibility of generating high-pressure pulse waves without increasing the transducer voltage by using sandwiched transducers, which are a stack of two or more transducers. Some discrepancies appeared, however, between the pressure measured at the surface of the front transducer and the arithmetic sum of the pressures generated by each transducer constituting the stack. In fact, development of such stacked transducers capable of generating surface pressures in the range of 2 to 5 MPa is very complex, which may explain why no aging tests have been reported in the literature thus far. In the first part of this paper, we theoretically determine the importance of the electroacoustical coupling between the two transducers on the generated surface pressure. We show that pressure losses due to these electroacoustical couplings are less than 5%. Experimental measurements done on a stacked transducer assembled and tightened in a castor oil-filled tank are in excellent accordance with the theoretical measurements. Using this assembly technique, it was possible to obtain, on average, out of four elements, a pressure of 7.5 MPa for the duration of 4 million shocks, which would allow the treatment of approximately 1000 patients.
机译：碎石术的新临床概念要求使用较小的电击头。只有在每个换能器表面产生的压力可以增加，使得焦点处的总压力保持不变的情况下，才可以减小压电震动头的尺寸。为了解决这个问题，提出了不同的解决方案。例如，已经证明，与压电陶瓷材料相反，压电复合材料允许在断裂之前产生较高的表面压力，这主要是因为径向模式被大大降低了。此外，在以前的论文中，我们展示了通过使用夹心式换能器（不包括两个或多个换能器的堆栈）而产生高压脉波而不增加换能器电压的可行性。但是，在前换能器表面测得的压力与构成烟囱的每个换能器产生的压力的算术总和之间出现了一些差异。实际上，这种能够产生2到5 MPa范围内的表面压力的堆叠式换能器的开发非常复杂，这可以解释为什么迄今为止在文献中没有报道过老化测试。在本文的第一部分，我们从理论上确定了两个换能器之间电声耦合对产生的表面压力的重要性。我们表明，由于这些电声耦合造成的压力损失小于5％。在组装并拧紧在蓖麻油箱中的堆叠式换能器上进行的实验测量与理论测量非常吻合。使用这种组装技术，在四百万次电击期间，平均可以从四个元素中获得7.5 MPa的压力，这将使大约1000名患者得到治疗。

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