无损检测技术是保证产品质量和设备安全运行的一门共性技术，已被广泛应用于现代工业的各个领域。随着现代工业和科学技术的发展，无损检测技术的重要性越来越被各个部门所重视。当前，无损检测技术已经形成一门新兴的独立的涉及物理学、电子学、计算机技术、信息处理技术、材料科学等学科的综合性应用技术科学。 无损检测是在不损害或基本不损害材料或构件的情况下采用物理、化学等方法和手段，探测被检对象内部和表面的各种缺陷及某些物理性能。无损检测与评价技术对于控制和改进产品质量，保证材料、零件和产品的可靠性，保证设备的安全运行以及提高生产效率、降低成本等方面都起着重要的作用，是发展现代工业和科学技术必不可少的重要措施之一。可以说，无损检测与评价技术的发展程度标志着一个国家的工业水平。 本课程主要讲述和学习电磁检测和超声检测的基本原理和方法，并注重电磁检测和超声检测技术的新发展以及在无损检测中应用的一些信号处理技术。内容的重点放在方法、原理和应用上，有较宽的知识面和一定的实用价值。本课程主要内容包括：电磁检测的基本原理和方法及其典型应用，包括电磁检测的物理基础、磁性检测、涡流检测和非常规涡流检测等技术；超声检测的基本原理和方法及其典型应用，包括超声检测的物理基础、声源辐射的声场、超声检测设备和方法；超声检测新技术及其应用，包括相控阵超声成像、扫描超声成像、超声全息、超声显微镜、ALOK超声成像和合成孔径超声成像等各种超声成像技术以及超声导波、声发射、激光超声和电磁超声等超声检测新技术；电磁检测新技术及其应用，其中包括磁记忆检测和远场涡流检测等技术。另外，还介绍在无损检测中应用的一些信号处理技术，如小波分析、神经网络和数据融合等技术。

Machines, as is true in the case of humans too, are fallible. This has motivated the search for techniques to locate and prevent problems before they can result in serious consequences. These techniques can be classified as either destructive or nondestructive. The practical benefits of nondestructive method are obvious, particularly if the results obtained are reliable. Nondestructive evaluation (NDE) techniques are concerned with detecting inhomogeneities in materials and characterizing their properties without causing any damage to the materials. Applications include the inspection of aircraft engines, motor vehicles, nuclear reactors, pipelines, bridges, railroads, trains, power stations, refineries，and oil platforms where failures can contribute to catastrophic disasters. NDE techniques are used extensively as a tool for controlling quality in manufacturing as well as a tool to ensure reliability and safety.Firstly, this course mainly introduces the basic principles, methods and typical applications of electromagnetic NDE techniques including the physical base of electromagnetic NDE, magnetic testing, and eddy current testing. Secondly, this course mainly introduces the basic principles, methods and typical applications of ultrasonic NDE techniques including the physical base of ultrasonic NDE, the analysis of acoustic field, ultrasonic transducers, and ultrasonic instruments. Thirdly, this course mainly introduces the basic principles, methods and typical applications of some emerging ultrasonic NDE techniques including ultrasonic phased array imaging, ultrasonic scanning imaging, ultrasonic holography, scanning acoustic microscope, ultrasonic guided wave technique, acoustic emission technique, laser ultrasonic technique, electromagnetic acoustic technique, etc. Some emerging electromagnetic NDE techniques including magnetic memory technique and remote eddy current technique are also introduced. Finally, this course mainly introduces some signal processing and pattern recognition techniques including wavelet analysis, artificial neural network, and data fusion, which can be used to process and analyze NDE data.