Graded Elastic Waveguide Metamaterial Rod for Up-Conversion of Longitudinal Axisymmetric Guided Ultrasonic Wave Modes

IEEE open journal of ultrasonics, ferroelectrics, and frequency control Pub Date : 2023-09-20 DOI:10.1109/OJUFFC.2023.3317363

S. R. Sandeep Kumar;Vineeth P. Ramachandran;Krishnan Balasubramaniam;Prabhu Rajagopal

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引用次数: 1

Abstract

Cylindrical or circular rod-type waveguides are of much interest in applications such as measurement of flow, temperature, material properties in harsh environments, and also in medical diagnostics. However, multiple waveguide modes exist in such systems, out of which only some are of interest to certain applications. For example, L(0,3) longitudinal mode excitation can optimally transmit elastic waves into the test specimen and help in better sensing and measurement when compared to other modes within the family of longitudinal guided waves. This paper demonstrates the up-conversion of longitudinal modes within the family of guided ultrasonic rod waves (from L(0,2) to L(0,3)), which is of interest to certain waveguide transducer applications. The mode up-conversion is demonstrated using numerical simulations and experiments. An analysis is used to bring more insights and guide the design of the metamaterial in this process.

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纵向轴对称导超声模向上转换的梯度弹性波导超材料棒

圆柱形或圆形棒型波导在诸如恶劣环境中的流量、温度、材料特性测量以及医疗诊断等应用中非常有意义。然而，在这种系统中存在多种波导模式，其中只有一些对某些应用感兴趣。例如，与纵导波族中的其他模式相比，L(0,3)纵模激励可以最优地将弹性波传递到试件中，有助于更好地感知和测量。本文演示了导超声棒波族(从L(0,2)到L(0,3))中纵向模式的上转换，这对某些波导换能器应用很有意义。通过数值模拟和实验对模式上转换进行了验证。在此过程中，通过分析可以获得更多的见解，并指导超材料的设计。

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IEEE open journal of ultrasonics, ferroelectrics, and frequency control

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