ASTM-E1774 Standard Guide for Electromagnetic Acoustic Transducers (EMATs)

ASTM-E1774 - 2017 EDITION - CURRENT
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Scope

1.1 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.

1.2 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.

1.3 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.

1.4 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.

1.5 Units—The values stated in inch-pound units are to be regarded as the standard. The SI values given in parentheses are for information only.

1.6 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.

1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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 ;; ICS Number Code 77.040.20 (Non-destructive testing of metals)

To find similar documents by ASTM Volume:

03.03 (Nondestructive Testing)

To find similar documents by classification:

17.140.01 (Acoustic measurements and noise abatement in general Including acoustic insulation)

77.040.20 (Non-destructive testing of metals Non-destructive testing in general, see 19.100 Non-destructive testing of welded joints, see 25.160.40)

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Document Number

ASTM-E1774-17

Revision Level

2017 EDITION

Status

Current

Modification Type

Revision

Publication Date

June 15, 2017

Document Type

Guide

Page Count

9 pages

Committee Number

E07.06