Ultrasonic Nondestructive Evaluation Systems - Industrial Application Issues
Ultrasonic Nondestructive Evaluation Systems - Industrial Application Issues
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超声波无损评估系统 - 工业应用问题
DOI：
10.1007/978-3-319-10566-6_4
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Caporale S
中科院分区：
文献类型：
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作者：
Caporale S
介绍了基于短脉冲的脉冲回波（PuE）模型作为起点。它的限制，在信号噪声比（SNR）方面进行审查，连同激发能量和时间分辨率之间的权衡。它示出了如何信号处理可以提高系统的灵敏度和分辨率方面的整体性能，只要激励波形的选择考虑到系统的特性，并与所采用的处理技术是一致的。可以操作的自由度是激励信号的时间演化规律和接收端采用的处理技术。在开发过程中，设计师应考虑所使用硬件设备的物理特征，以优化整体性能。讨论了引入品质因子的重要性。通过提供系统性能的定量测量，它们是驱动正式优化策略和比较不同方法的不可或缺的工具。介绍了与应用相关的优点因素，以试图克服当前的一些限制，并为将超声技术扩展到多输入多输出（MIMO）系统奠定基础，这些系统将在下一章中讨论。
The pulse-echo (PuE) model based on short pulses is introduced as a starting point. Its limits in terms of signal-to-noise ratio (SNR) are reviewed, together with the tradeoff between the excitation energy and the time resolution. It is shown how signal processing can improve the overall performance in terms of system sensitivity and resolution as long as the exciting waveform is chosen taking into account the system characteristics and is in agreement with the adopted processing techniques. The degrees of freedom on which one can operate are the time evolution law of the excitation signal and the processing technique adopted on the receiving end. In their exploitation, the designer should consider the physical characteristics of the hardware devices being employed in order to optimize the overall performance. The importance of introducing merit factors is discussed. By offering a quantitative measure of system performance, they are indispensable tools to drive formal optimization strategies and for comparing different approaches. Application-related merit factors are introduced for trying to overcome some current limitations and to prepare the ground for the extension of ultrasonic techniques to multiple input, multiple output (MIMO) systems, which are considered in the following chapter.