Electromagnetic acoustic transducer
- Albuquerque, NM
- Sandia Park, NM
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.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- DOE Contract Number:
- BQ2202AN
- Assignee:
- Magnasonics, Inc. (Albuquerque, NM)
- Patent Number(s):
- US 4777824
- OSTI ID:
- 866740
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
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