起源于20世纪初,超声检测在医学中的应用越来越广泛,工业,和材料科学。在超声检测中,实现高信噪比和高效率是至关重要的。前者意味着成像清晰度和检测深度的增加,而后者有助于更快地刷新图像。用常规的短脉冲来激励探头很难平衡这两个指标,所以在一般的处理方法中,这两个因素需要权衡。为了解决上述问题,编码激励(CE)可以增加脉冲持续时间,并提供了巨大的潜力,以提高信噪比与等效甚至更高的效率。在本文中,我们首先回顾CE的基本原理,包括信号调制,信号传输,信号接收,脉冲压缩,和优化方法。然后,我们介绍了CE在超声检测不同领域的应用,专注于工业体波单探头检测,工业导波检测,工业体波相控阵检测,和医学相控阵成像。最后,我们指出了CE的优势以及一些未来的方向。
Originating in the early 20th century, ultrasonic testing has found increasingly extensive applications in medicine, industry, and materials science. Achieving both a high signal-to-noise ratio and high efficiency is crucial in ultrasonic testing. The former means an increase in imaging clarity as well as the detection depth, while the latter facilitates a faster refresh of the image. It is difficult to balance these two indicators with a conventional short pulse to excite the probe, so in general handling methods, these two factors have a trade-off. To solve the above problems, coded excitation (CE) can increase the pulse duration and offers great potential to improve the signal-to-noise ratio with equivalent or even higher efficiency. In this paper, we first review the fundamentals of CE, including signal modulation, signal transmission, signal reception, pulse compression, and optimization methods. Then, we introduce the application of CE in different areas of ultrasonic testing, with a focus on industrial bulk wave single-probe detection, industrial guided wave detection, industrial bulk wave phased array detection, and medical phased array imaging. Finally, we point out the advantages as well as a few future directions of CE.