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![Electromagnetic Generation of Acoustic Waves in Metals [microform] : Applications to Ultrasonic Measurements PDF](https://books.google.com/books/content/images/frontcover/ksnhMwEACAAJ?fife=w150-h200)
Author: Lyall, Kenneth Russell
Publisher: National Library of Canada
ISBN:
Category : Phonons
Languages : en
Pages : 358
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Book Description
![Electromagnetic Generation of Acoustic Waves in Metals [microform] : Applications to Ultrasonic Measurements PDF](https://books.google.com/books/content/images/frontcover/ksnhMwEACAAJ?fife=w80-h100)
Author: Lyall, Kenneth Russell
Publisher: National Library of Canada
ISBN:
Category : Phonons
Languages : en
Pages : 358
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Book Description
Author: Kenneth Russell Lyall
Publisher:
ISBN:
Category : Electro-acoustics
Languages : en
Pages : 358
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Book Description
Author: Dale Everett Chimenti
Publisher:
ISBN:
Category : Hall effect
Languages : en
Pages : 264
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 83
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Book Description
Author: Martin R. Gaerttner
Publisher:
ISBN:
Category : Sound-waves
Languages : en
Pages : 332
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Book Description
"A method of generating (and detecting) ultrasound in metals through purely electromagnetic means is investigated in this thesis. Radio frequency pulse echo techniques used for studying this process, called direct generation (or detection), are described. Measurements of the coupling efficiency of direct generation in a number of metals are reported for both the local and non local limits of electrical conductivity. Accurate measurements of the temperature, frequency, and magnetic field dependence have been made using frequencies between 3 and 100MHz. A free electron theory which assumes specular scattering of electrons at the surface has been proposed by others. This theory is extended in this thesis and quantitative comparisons with experimental measurements are presented. It has been found that, in the local limit of conductivity, experiment and theory are in good agreement for both transverse and longitudinal waves. In the non local limit, only transverse wave direct generation was considered. Discrepancies between experiment and theory were observed for the non local case with a magnetic field parallel to the direction of acoustic propagation. It is postulated that effects of diffuse scattering of electrons at the surface are responsible for some discrepancies. An interesting oscillatory magnetic field dependence of direct generation is reported for magnetic fields oriented perpendicular to the direction of acoustic propagation. The effect is demonstrated to result from forces associated with Gantmakher splashes. Although the coupling efficiency of direct electromagnetic generation is weak, it is demonstrated that signals can be obtained that are useful for non destructive testing. There are indications that non local direct generation becomes very efficient at microwave frequencies. Direct generation has also been observed in liquid metals."--Abstract.
Author: David Kuei-yu Hsu
Publisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 268
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Author: Jean-Pierre Masson
Publisher:
ISBN:
Category : Shear (Mechanics)
Languages : en
Pages : 136
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Author: Donald Malcolm Boyd
Publisher:
ISBN:
Category :
Languages : en
Pages : 234
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Book Description
Author: Songling Huang
Publisher: Springer
ISBN: 9811005648
Category : Technology & Engineering
Languages : en
Pages : 311
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Book Description
This book introduces the fundamental theory of electromagnetic ultrasonic guided waves, together with its applications. It includes the dispersion characteristics and matching theory of guided waves; the mechanism of production and theoretical model of electromagnetic ultrasonic guided waves; the effect mechanism between guided waves and defects; the simulation method for the entire process of electromagnetic ultrasonic guided wave propagation; electromagnetic ultrasonic thickness measurement; pipeline axial guided wave defect detection; and electromagnetic ultrasonic guided wave detection of gas pipeline cracks. This theory and findings on applications draw on the author’s intensive research over the past eight years. The book can be used for nondestructive testing technology and as an engineering reference work. The specific implementation of the electromagnetic ultrasonic guided wave system presented here will also be of value for other nondestructive test developers.
Author: Masahiko Hirao
Publisher: Springer
ISBN: 9784431560340
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
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.
