Symmetric reflector ultrasonic transducers (SRUTs) are a new type of ultrasonic transducer that take advantage of the ultrasonic wave emitted on the rear face of the active element. In this work, the electroacoustic modeling and characterization of such a structure is reported. Using the well-known Krimholtz, Leedom, et Matthaei (KLM) model, the electroacoustic response of a SRUT based on a piezoelectric ceramic with one matching layer is calculated. Simulations show that the optimal acoustic impedance of the matching layer should be lower than for conventional transducers, leading to a relative bandwidth of approximately 50%. The characterization of such a transducer based on a piezoceramic plate has been carried out. Bandwidth and sensitivity are reported. They are found to be close to the simulation results and demonstrate that these new types of transducers need to be designed according to new rules compared to conventional ones.

中文翻译：

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对称反射器超声换能器建模和表征：匹配层对电声性能的作用。

对称反射式超声换能器（SRUT）是一种利用有源元件背面发射的超声波的新型超声换能器。在这项工作中，报告了这种结构的电声建模和表征。使用著名的 Krimholtz, Leedom, et Matthaei (KLM) 模型，计算了基于具有一个匹配层的压电陶瓷的 SRUT 的电声响应。仿真表明，匹配层的最佳声阻抗应低于传统换能器，从而导致大约 50% 的相对带宽。已经对这种基于压电陶瓷板的换能器进行了表征。报告了带宽和灵敏度。