Electromagnetic Acoustic Transducers: Noncontacting Ultrasonic Measurements using EMATs

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Springer, Oct 25, 2016 - Technology & Engineering - 380 pages

This second edition provides comprehensive information on electromagnetic acoustic transducers (EMATs), from the theory and physical principles of EMATs to the construction of systems and their applications to scientific and industrial ultrasonic measurements on materials. The original version has been complemented with selected ideas on ultrasonic measurement that have emerged since the first edition was released.

The book is divided into four parts:

PART I offers a self-contained description of the basic elements of coupling mechanisms along with the practical designing of EMATs for various purposes. Several implementations to compensate for EMATs’ low transfer efficiency are provided, along with useful tips on how to make an EMAT.

PART II describes the principle of electromagnetic acoustic resonance (EMAR), which makes the most of EMATs’ contactless nature and is the most successful amplification mechanism for precise measurements of velocity and attenuation.

PART III applies EMAR to studying physical acoustics. New measurements have emerged with regard to four major subjects: in situ monitoring of dislocation behavior, determination of anisotropic elastic constants, pointwise elasticity mapping (RUM), and acoustic nonlinearity evolution.

PART IV deals with a variety of individual issues encountered in industrial applications, for which the EMATs are believed to be the best solutions. This is proven by a number of field applications.

 

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Contents

1 Introduction
1
Development of EMAT Techniques
12
2 Coupling Mechanism
15
3 Available EMATs
39
4 Brief Instruction to Build EMATs
68
Resonance Spectroscopy with EMATSEMAR
80
5 Principles of EMAR for Spectral Response
81
6 FreeDecay Measurement for Attenuation and Internal Friction
93
10 Nonlinear Acoustics for Microstructural Evolution
209
Industrial Applications
217
11 Online Texture Monitoring of Steel Sheets
219
12 Acoustoelastic Stress Measurements
232
13 Measurement of Induction Hardening Depth
271
14 Detection of Flaw and Corrosion
281
15 Average Grain Size of Steels
303
16 RemainingLife Assessment of Fatigued Metals
311

Physical Acoustic Studies
103
7 InSitu Monitoring of Dislocation Mobility
104
8 Elastic Constants and Internal Friction of Advanced Materials
133
9 Resonance Ultrasound Microscopy
192
17 Creep Damage Detection
336
18 Field Applications of EMATs
347
Index
373
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