Measuring and testing – Vibration – By mechanical waves
Patent
1987-06-25
1988-10-18
Chapman, John
Measuring and testing
Vibration
By mechanical waves
324226, G01N 2904
Patent
active
047778245
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.
REFERENCES:
patent: 3460063 (1969-08-01), Houck
patent: 3583213 (1971-06-01), Houck et al.
patent: 3850028 (1974-11-01), Thompson et al.
patent: 4295214 (1981-10-01), Thompson et al.
patent: 4466287 (1984-08-01), Repplinger et al.
patent: 4578999 (1986-04-01), Abend et al.
patent: 4593567 (1986-06-01), Isselstein et al.
"Generation of Ultrasonic Waves Without Using a Transducer", E. R. Dobbs and J. D. Llewellyn, pp. 49-56 in Non-Destructive Testing, vol. 4, No. 1, Feb. 1971.
Ultrasonic Transducers for Non Destructive Testing M. G. Silk, Adam Hilger Ltd, Bristol, U.K. 1984, pp. 111-119.
Legg, K. O., and Meredith, D. J., Journal of Physics D, Applied Physics, vol. 3 (1970), pp. L61-L63.
Wallace, W. D., Houck, J. R., Bowers, R., Maxfield, B. W., and Gaerttner, M. R., 1968, Review of Scientific Instruments, vol. 39, pp. 1863-1864.
"Pulsed Laser/Electromagnetic Acoustic Transducer Approach to Ultrasonic Sensor Needs for Steel Processing," by G. A. Alers and H. N. G. Wadley, pp. 627-638 in Rev. Prog. in Quantitative Nondestructive Evaluation, vol. 6A, 1987.
Alers George A.
Burns, Jr. Leigh R.
MacLauchlan Daniel T.
Bell Robert P.
Chapman John
Garmong Gregory O.
Magnasonics, Inc.
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