Apparatus and method including flux injector pole position sensors for detecting physical flaws in ferromagnetic objects
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United States of America Patent
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Sep 14, 1993
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N/A
app pub date -
Jun 18, 1992
filing date -
Jun 18, 1992
priority date (Note) -
Expired
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Abstract
A direct-current electromagnetic device for nondestructively detecting localized discontinuities in ferromagnetic objects is disclosed. The device comprises an adjustable dc excitor means, a magnetic flux injector means, an external magnetic field detector means, a plurality of position sensors, a signal processing means and a control means. It is particularly adapted for detecting flaws in soiled and distorted ferromagnetic objects such as water wall tubes in industrial boilers. An apparatus incorporating the device and a method of detecting discontinuities are also disclosed.
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