Measuring and testing – Vibration – By mechanical waves
Patent
1978-06-22
1980-01-22
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73643, G01N 2904
Patent
active
041843746
ABSTRACT:
A method and an apparatus are provided for ultrasonically inspecting a cylindrical object. The object is placed between the poles of a magnet to create a circumferential magnetic field in the object. A group of electromagnetic transducers (EMAT's) are placed adjacent the material so that the transducers scan the entire object when it is rotated. When an RF signal is applied to the transducers, elastic waves are generated in the material. These elastic waves reflect from defects in the material and these reflections are received by the transducers.
REFERENCES:
patent: 3555887 (1971-01-01), Wood
patent: 3763695 (1973-10-01), Zeiters
patent: 3850028 (1974-11-01), Thompson et al.
patent: 4092868 (1978-06-01), Thompson et al.
patent: 4100809 (1978-07-01), Bobrov et al.
Fortunko Christopher M.
Thompson Robert B.
Deinken John J.
Humphries L. Lee
Kreitman Stephen A.
Malin Craig O.
Rockwell International Corporation
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