Magnetic method and apparatus for measuring wall thickness

Details Magnetic method and apparatus for measuring wall thickness Magnetic method and apparatus for measuring wall thickness

1981-11-20

1983-12-06

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

324220, 324226, 324229, G01N 2904, G01N 2782

Patent

active

044185740

ABSTRACT:
A pulsed magnetic procedure and apparatus for measuring wall thickness. It is especially applicable to pipelines. It includes pulsing a magnetic reluctance coil that is located close to the wall, and measuring the inductance of the pulsed coil. Also the distance of the coil from the wall is accurately determined so that the inductance is a measure of the wall thickness.
Apparatus may include the combination of an ultrasonic transducer mounted fixed relative to the magnetic pulse coil and arranged so that ultrasonic energy pulses are directed toward the wall. In this manner reflected ultrasonic pulses will provide a measure of the distance. In addition, by proper angle thereof, ultrasonic pulses may also determine the presence of any anomaly.

REFERENCES:
patent: 2573799 (1951-11-01), Machean
patent: 3205435 (1965-09-01), Nuttall
patent: 3237446 (1966-03-01), Wood
patent: 3356938 (1967-12-01), Wood
patent: 3732726 (1973-05-01), Ferber
patent: 3764897 (1973-10-01), Greenwood
patent: 4292588 (1981-09-01), Smith

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