[PDF] Microwave Nondestructive Testing Methods eBook

Author : R. Zoughi
Publisher : Springer Science & Business Media
Page : 283 pages
File Size : 12,7 MB
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9401513031

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Microwave and millimeter-wave non-destructive testing and evaluation (NDT&E) is generally understood to mean using high-frequency electromagnetic energy to inspect and characterize materials and structures. In spite of possessing some distinct advantages in certain applications to other NDT&E techniques, microwave NDT&E has only found compared limited practical application during the past 45 years. These advantages include lack of a need for contact between the sensor and the object being inspected, the ability to penetrate dielectric materials, and superior sensitivity to certain material constituents and flaws. One factor contributing to this minimal acceptance by the NDT &E community has been a generally poor understanding in this community of the theory and practice that underlie the technology. This situation exists partly because of a paucity of microwave NDT&E textbook and reference material. Some chapters, reviews, and books aimed at filling this need have been published in the past but, for the most part, this material is based on the use of older microwave technology. However, during the past ten years great strides have been made in ternlS of the cost, size, and ease of use of microwave components. In addition, recent advances in modeling and measurement techniques have expanded the range of applications for microwave NDT&E. Such applications include inspecting modern materials such as composites, detecting and characterizing surface flaws, and evaluating the compressive strength of cement structures. These advances have created an urgent need for up-to-date textbook material on this subject.

Author : N. Ida
Publisher : Springer Science & Business Media
Page : 411 pages
File Size : 39,95 MB
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9401127395

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Microwave testing has been paid only scant attention in the literature as a method for nondestructive testing of materials, yet it offers some attractive features, especially for the testing of composite and other non-metallic materials. Microwave techniques have been used in a large number of applications that can be classified as nondestructive testing applications, ranging from large scale remote sensing to detection of tumors in the body. This volume describes a unified approach to microwave nondestructive testing by presenting the three essential components of testing: theory, practice, and modelling. While recognizing that each of these subjects is wide enough to justify a volume of its own, the presentation of the three topics together shows that these are interrelated and should be practiced together. While few will argue against a good theoretical background, modelling and simulation of the testing environment is seldom part of the NDT training in any method, but particularly so in microwave testing. The text is devided in four parts. The first part presents the field theory background necessary for understanding the microwave domain. The second part treats microwave measurements as well as devices and sources and the third part discusses practical tests applicable to a variety of materials and geometries. The fourth part discusses modelling of microwave testing. Each chapter contains a bibliography intended to expand on the material given and, in particular, to point to subjects which could not be covered either as not appropriate or for lack of space. For engineers, applied physicsts, material scientists.

Author : Marc Dominic Navagato
Publisher :
Page : 0 pages
File Size : 23,80 MB
Release : 2022
Category :
ISBN :

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Nondestructive testing (NDT) is a class of material inspection where the external and internal states of a material can be determined without altering the integrity of the material. Many NDT methods are available, such as visual inspection, ultrasonic testing, eddy-current testing, radiographic testing, and microwave testing. In general, the use of a specific method over another depends on the properties of the material under inspection. Unlike some of the mentioned NDT methods, which require in-contact configurations, high-power systems, or the application of couplant gels, the (free-space) microwave testing technique offers a unique solution that allows for non-contact configurations, does not require couplant gels, and can be conducted using low-power systems. Microwave nondestructive testing (MNDT) is a well-suited NDT method for inspection of dielectric materials, as microwaves can penetrate the inner layers of dielectric materials. Composite materials tend to possess dielectric properties, making them ideal candidates for MDNT. Composite materials are widely used in aerospace, automotive, civil, and consumer industries, where they are subject to various hazards, such as impact damages, weathering effects, and salt-spray corrosion. Identifying such defects is critical for preventing extended physical damage, performance degradation, and high financial costs. MNDT can be used to identify these types of internal defects. This dissertation presents the development of a noise-based MDNT system used to identify flaws within the internal layers of dielectric and composite materials. The MNDT system operates in the X-band frequency range (8.2-12.4 GHz) and uses noise waveforms. Noise waveforms are useful for MNDT as they exhibit excellent autocorrelation properties, which aids in the defect identification problem. A description of the noise waveforms and the MDNT system are provided in this dissertation. The MNDT system is validated through various inspections of dielectric and composite materials with hidden anomalies, where the resultant microwave images reveal the presence of the hidden defects. This work also shows that supervised and unsupervised techniques, based on Neural Networks and dimensionality reduction techniques, can be used to enhance the contrast of hidden defects within composite materials. It is then shown how these techniques can remove the impacts caused by non-uniform standoff distances between the sample under test and the microwave sensor, which tend to mask the presence of minor defects.

Author : Gerhard Huebschen
Publisher : Woodhead Publishing
Page : 322 pages
File Size : 15,9 MB
Release : 2016-03-23
Category : Technology & Engineering
ISBN : 008100057X

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Materials Characterization Using Nondestructive Evaluation (NDE) Methods discusses NDT methods and how they are highly desirable for both long-term monitoring and short-term assessment of materials, providing crucial early warning that the fatigue life of a material has elapsed, thus helping to prevent service failures. Materials Characterization Using Nondestructive Evaluation (NDE) Methods gives an overview of established and new NDT techniques for the characterization of materials, with a focus on materials used in the automotive, aerospace, power plants, and infrastructure construction industries. Each chapter focuses on a different NDT technique and indicates the potential of the method by selected examples of applications. Methods covered include scanning and transmission electron microscopy, X-ray microtomography and diffraction, ultrasonic, electromagnetic, microwave, and hybrid techniques. The authors review both the determination of microstructure properties, including phase content and grain size, and the determination of mechanical properties, such as hardness, toughness, yield strength, texture, and residual stress. Gives an overview of established and new NDT techniques, including scanning and transmission electron microscopy, X-ray microtomography and diffraction, ultrasonic, electromagnetic, microwave, and hybrid techniques Reviews the determination of microstructural and mechanical properties Focuses on materials used in the automotive, aerospace, power plants, and infrastructure construction industries Serves as a highly desirable resource for both long-term monitoring and short-term assessment of materials

Author : J. Blitz
Publisher : Springer Science & Business Media
Page : 272 pages
File Size : 33,27 MB
Release : 2012-12-06
Category : Technology & Engineering
ISBN : 9401158185

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This book is intended to help satisfy an urgent requirement for up-to date comprehensive texts at graduate and senior undergraduate levels on the subjects in non-destructive testing (NDT). The subject matter here is confined to electrical and magnetic methods, with emphasis on the widely used eddy current and magnetic flux leakage methods (including particle inspection), but proper attention is paid to other techniques, such as microwave and AC field applications, which are rapidly growing in importance. Theoretical analyses relating to the various methods are discussed and the depths of presentation are often governed by whether or not the information is readily available elsewhere. Thus, for example, a considerable amount of space is devoted to eddy current theory at what the author considers to be a reasonable standard and not, as usually experienced, in either a too elementary manner or at a level appreciated only by a postgraduate theoretical physicist. The inclusion of the introductory chapter is intended to acquaint the reader with some of the philosophy of NDT and to compare, briefly, the relative performances of the more important methods of testing.

Author : Milad Saeedifar
Publisher : Elsevier
Page : 333 pages
File Size : 48,47 MB
Release : 2024-08-19
Category : Technology & Engineering
ISBN : 0443141215

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Non-destructive Testing of Impact Damage in Fiber-reinforced Polymer Composites: Fundamentals and Applications provides detailed knowledge on the fundamentals and applications of frequently used nondestructive testing (NDT) techniques utilized to assess impact damage in composite structures. This book starts with an introduction to impact damage in composite structures, each subsequent chapter focuses on evaluating damage using specific NDT methods. Chapters 2–4 concentrate on vision-based NDT methods such as visual inspection, digital image correlation, and digital shearography. Following this, Chapters 5–6 delve into ultrasound-based methods, including acoustic emission and phased-array ultrasonic inspection. Radiation-based methods, micro-CT, and thermography are discussed in Chapters 7 and 8, while Chapters 9 and 10 elucidate microwave inspection and electrical impedance tomography. This book is a useful reference for both academia and industry and covers the fundamentals, practical tips, case studies, and applications, as well as current research trends and future possibilities, for each technique. Insights into the diverse damage levels in composite materials resulting from low-velocity impact, ranging from micro matrix cracks to severe delamination and fiber breakage Covers a broad range of NDT techniques, including recently developed NDT techniques, suitable for detecting impact damage in composite materials Serves as a valuable reference for both academia and industry, providing comprehensive coverage of fundamental principles, practical insights, applications, case studies, current research trends, and future prospects for each NDT technique