Electrical and Magnetic Methods of Non-destructive Testing [Hardcover]

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.1 Introduction.- 1.1 General considerations.- 1.2 Methods of non-destructive testing.- 1.3 Electrical and magnetic methods.- 1.4 Choosing a method.- 1.5 Automation in non-destructive testing.- 1.6 Conclusion.- 1.7 Further reading.- 2 Fundamental theory.- 2.1 General considerations.- 2.2 Electrical conductivity and resistivity.- 2.3 Dielectric materials.- 2.4 Electromagnetism.- 2.5 Alternating currents.- 2.6 Circuit networks.- 2.7 Ferromagnetic materials.- 2.8 Electromagnetic radiation.- 3 Magnetic methods.- 3.1 Introduction.- 3.2 Flux leakage methods.- 3.3 Magnetic particle inspection (MPI).- 3.4 Magnetic tape inspection (magnetography).- 3.5 Quantitative flux leakage detectors.- 3.6 Quantitative flux leakage applications.- 3.7 Magnetization and hysteresis methods.- 3.8 Less common magnetic techniques.- 4 Eddy lÞ