Coded waveforms for optimised air-coupled ultrasonic nondestructive evaluation
Coded waveforms for optimised air-coupled ultrasonic nondestructive evaluation
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DOI：
10.1016/j.ultras.2014.03.007
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发表时间：
2014-09-01
期刊：
影响因子：
4.2
通讯作者：
Ricci, Marco
中科院分区：
文献类型：
--
作者：
Hutchins, David;Burrascano, Pietro;Ricci, Marco
本文研究了可用于空气耦合超声的各种类型的编码波形，使用脉冲压缩方法进行信号处理。由于空气和许多固体材料之间存在较大的声学不匹配，许多空气耦合超声无损评估测量中的信噪比较低，因此需要这些。描述了各种波形，包括扫频信号和二进制调制信号，并比较了它们在存在噪声的情况下的性能。结果表明，调制信号的最佳选择取决于可用带宽和进行的测量类型。 (C) 2014 Elsevier B.V. 保留所有权利。
This paper investigates various types of coded waveforms that could be used for air-coupled ultrasound, using a pulse compression approach to signal processing. These are needed because of the low signal-to-noise ratios that are found in many air-coupled ultrasonic nondestructive evaluation measurements, due to the large acoustic mismatch between air and many solid materials. The various waveforms, including both swept-frequency signals and those with binary modulation, are described, and their performance in the presence of noise is compared. It is shown that the optimum choice of modulation signal depends on the bandwidth available and the type of measurement being made. (C) 2014 Elsevier B.V. All rights reserved.