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Title: Electromagnetic acoustic transducer

Abstract

A noncontact ultrasonic transducer for studying the acoustic properties of a metal workpiece includes a generally planar magnetizing coil positioned above the surface of the workpiece, and a generally planar eddy current coil between the magnetizing coil and the workpiece. When a large current is passed through the magnetizing coil, a large magnetic field is applied to the near-surface regions of the workpiece. The eddy current coil can then be operated as a transmitter by passing an alternating current therethrough to excite ultrasonic waves in the surface of the workpiece, or operated as a passive receiver to sense ultrasonic waves in the surface by measuring the output signal. The geometries of the two coils can be varied widely to be effective for different types of ultrasonic waves. The coils are preferably packaged in a housing which does not interfere with their operation, but protects them from a variety of adverse environmental conditions.

Inventors:
 [1];  [1];  [2]
  1. (Albuquerque, NM)
  2. (Sandia Park, NM)
Issue Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
OSTI Identifier:
866740
Patent Number(s):
4777824
Assignee:
Magnasonics, Inc. (Albuquerque, NM) SNL
DOE Contract Number:  
BQ2202AN
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electromagnetic; acoustic; transducer; noncontact; ultrasonic; studying; properties; metal; workpiece; planar; magnetizing; coil; positioned; surface; eddy; current; passed; magnetic; field; applied; near-surface; regions; operated; transmitter; passing; alternating; therethrough; excite; waves; passive; receiver; sense; measuring; output; signal; geometries; coils; varied; widely; effective; types; preferably; packaged; housing; interfere; operation; protects; variety; adverse; environmental; conditions; ultrasonic wave; acoustic properties; current therethrough; acoustic transducer; surface region; eddy current; ultrasonic transducer; magnetic field; output signal; alternating current; ultrasonic waves; environmental conditions; near-surface regions; near-surface region; current coil; metal workpiece; surface regions; electromagnetic acoustic; adverse environmental; /73/324/

Citation Formats

Alers, George A., Burns, Jr., Leigh R., and MacLauchlan, Daniel T. Electromagnetic acoustic transducer. United States: N. p., 1988. Web.
Alers, George A., Burns, Jr., Leigh R., & MacLauchlan, Daniel T. Electromagnetic acoustic transducer. United States.
Alers, George A., Burns, Jr., Leigh R., and MacLauchlan, Daniel T. Fri . "Electromagnetic acoustic transducer". United States. https://www.osti.gov/servlets/purl/866740.
@article{osti_866740,
title = {Electromagnetic acoustic transducer},
author = {Alers, George A. and Burns, Jr., Leigh R. and MacLauchlan, Daniel T.},
abstractNote = {A noncontact ultrasonic transducer for studying the acoustic properties of a metal workpiece includes a generally planar magnetizing coil positioned above the surface of the workpiece, and a generally planar eddy current coil between the magnetizing coil and the workpiece. When a large current is passed through the magnetizing coil, a large magnetic field is applied to the near-surface regions of the workpiece. The eddy current coil can then be operated as a transmitter by passing an alternating current therethrough to excite ultrasonic waves in the surface of the workpiece, or operated as a passive receiver to sense ultrasonic waves in the surface by measuring the output signal. The geometries of the two coils can be varied widely to be effective for different types of ultrasonic waves. The coils are preferably packaged in a housing which does not interfere with their operation, but protects them from a variety of adverse environmental conditions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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