1 An Ultrasonic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Elements of an Ultrasonic NDE System . . . . . . . . . . . . . . . . . . 1 1.2 The Pulser-Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Ultrasonic Transducers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.4 Ultrasonic Digitizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.5 Ultrasonic Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.6 About the Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.7 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2 Linear Systems and the Fourier Transform . . . . . . . . . . . . . . . . . . 15 2.1 Linear Time-Shift Invariant Systems . . . . . . . . . . . . . . . . . . . . 15 2.2 The Fourier Transform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.3 LTI Systems and the Impulse Response Function . . . . . . . . . . . 20 2.4 An Ultrasonic NDE Measurement System as an LTI System . . . 22 2.5 About the Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2.6 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3 Wave Motion Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.1 Governing Equations for a Fluid . . . . . . . . . . . . . . . . . . . . . . . 33 3.1.1 Equations of Motion . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.1.2 Constitutive Equations . . . . . . . . . . . . . . . . . . . . . . . . 34 3.1.3 The Wave Equation . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.1.4 Interface/Boundary Conditions . . . . . . . . . . . . . . . . . . 36 3.2

本压缩包内涵丰富，需要自己提取学习修改，其中包括无损检测，信号处，超声波仿真及相关程序，内含有帮助文档和学习文件文献。

超声波无损检测基础，第一版，仅供学术交流，用于商业用途，责任自负

Nondestructive Raman spectroscopy and external-beam proton-induced X-ray emission (PIXE) technique to analyze eight ancient glasses unearthed from the provinces of Henan, Hubei, and Jiangsu, which allowes for a good characterization of the glass matrix and chemical compositions, is carried out. The results indicate that all the eight glass samples could be typically divided into three systems: faience (sample No. SZWG-4), PbO-BaO-SiO2 (sample Nos. NYWKI-5-1, HNWKII-88, and HNWKII-84), and Na2OCa

无损检测技术，代码和原理，内容详细，很适合检测技术研究