Application of one-bit time reversal technique to mechanical strain monitoring in plates

Alan Conci Kubrusly, A. Braga, J. P. von der Weid, N. Pérez, J. Adamowski, Timoteo Francisco de Oliveira
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引用次数: 1

Abstract

This paper presents the application of the one-bit time reversal technique to a longitudinal strain sensor. The setup consists of a pair of piezoelectric transducers bonded in the extremities of a strip of aluminum plate. When the plate is subjected to traction, time reversal focalization is performed, the mismatch between the impulse response at initial and strained levels causes loss in the focusing quality. The strain can be evaluated by measuring either the time of flight shift or the amplitude decrease in the focused signal. One-bit time reversal can simplify the electronic device to perform the proposed technique. In this work, the results using one-bit and normal time reversal implementation were compared. Experiments were performed using three different 2-2 piezocomposite transducers pairs at 500, 1000 and 2250 kHz. The longitudinal strain was applied up to 150 μ-strain using a strain gauge as a reference. The time reversal energy efficiency was used as a spectrum figure of merit and obeys the sensitivity behavior. The one-bit time reversal variation provided good focused signal for all experiments and no significant loss in focus quality. Moreover, every configuration showed a higher sensitivity than its normal time reversal version, at least 10% depending on the transducer. The one-bit technique reveals an important enhancement for the method; it holds the natural advantage of being simpler and the benefit of higher sensitivity.
位时间反转技术在钢板力学应变监测中的应用
本文介绍了一元时间反转技术在纵向应变传感器中的应用。该装置由一对连接在铝板条两端的压电换能器组成。当平板受到牵引时,进行时间反转聚焦,初始水平和应变水平的脉冲响应不匹配导致聚焦质量损失。应变可以通过测量飞行位移时间或聚焦信号的幅度减小来评估。位时间反转可以简化电子设备来执行所提出的技术。在这项工作中,比较了使用1位和正常时间反转实现的结果。实验使用三种不同的2-2压电复合换能器对在500,1000和2250 kHz进行。以应变片为参考,施加纵向应变至150 μ-应变。时间反转能量效率作为优点谱图,符合灵敏度特性。1位时间反转变化为所有实验提供了良好的聚焦信号,且聚焦质量没有明显损失。此外,每种配置都显示出比其正常时间反转版本更高的灵敏度,至少10%取决于换能器。一比特技术显示了该方法的重要改进;它具有简单的天然优势和更高的灵敏度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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