Ultrasonic inspection of a cylindrical object

Details Ultrasonic inspection of a cylindrical object Ultrasonic inspection of a cylindrical object

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.

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