Measuring and testing – Vibration – By mechanical waves
Patent
1981-07-31
1983-08-02
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
310313A, 343 172PC, G01N 2904
Patent
active
043959130
ABSTRACT:
A broadband electromagnetic acoustic transducer is disclosed for use with an electrically conductive object. The transducer includes a source of magnetic flux for establishing a static magnetic field in the object and an electrical conductor for inducing eddy currents in the object when an alternating current is applied to the conductor. The magnetic field and the conductor are oriented so that the vector product of the magnetic field and the eddy currents produces an instantaneous force field in the object which is periodically alternately directed with a logarithmic periodicity. The source of magnetic flux may be provided by a plurality of alternately oriented magnets aligned along a propagation direction. Alternatively, the conductor may be a serpentine conductor with a plurality of parallel elements which are perpendicular to a propagation direction, the ratio of adjacent spacings between the elements being constant.
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Isbell, Log Periodic Dipole Arrays, IRE Transactions on Antennas and Propagation, May 1960, p. 260.
Birmiel Howard A.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
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