ASTM E 1774 Standard Guide for Electromagnetic Acoustic Transducers (EMATs)
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ASTM E 1774 Document Information:
Title
Standard Guide for Electromagnetic Acoustic Transducers (EMATs)
ASTM International
Publication Date:
Dec 10, 1996
Scope:
This guide is intended primarily for tutorial purposes. It
provides an overview of the general principles governing the
operation and use of electromagnetic acoustic transducers (EMATs)
for ultrasonic examination.
This guide describes a non-contact technique for coupling
ultrasonic energy into an electrically conductive or ferromagnetic
material, or both, through the use of electromagnetic fields. This
guide describes the theory of operation and basic design
considerations as well as the advantages and limitations of the
technique.
This guide is intended to serve as a general reference to assist
in determining the usefulness of EMATs for a given application as
well as provide fundamental information regarding their design and
operation. This guide provides guidance for the generation of
longitudinal, shear, Rayleigh, and Lamb wave modes using EMATs.
This guide does not contain detailed procedures for the use of
EMATs in any specific applications; nor does it promote the use of
EMATs without thorough testing prior to their use for examination
purposes. Some applications in which EMATs have been applied
successfully are outlined in Section 9.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- angle beam
- conductor
- electromagnetic acoustic transducer (EMAT)
- flaw detection
- Lamb waves
- longitudinal waves
- Lorentz forces
- magnet
- magnetostriction
- Rayleigh waves
- shear waves
- straight beam
- thickness gaging
- ultrasonics
- wave mode
- weld examination
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