Magnetic flux measuring method and apparatus for detecting high

Details Magnetic flux measuring method and apparatus for detecting high Magnetic flux measuring method and apparatus for detecting high

1995-02-14

1996-07-16

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324234, 324237, G01R 3304, G01R 3312, G01N 2782

Patent

active

055370381

ABSTRACT:
A current of predetermined frequency is fed to a coil wound around a ferromagnetic core through a fixed impedance means. A magnetic flux measurement is performed in terms of a level of a DC component of a voltage generated across the coil. A DC bias is added to the current of predetermined frequency, and the resultant current is applied through the fixed impedance means to the coil wound around the ferromagnetic core. A magnetic flux measurement is performed in terms of a level of a DC component of the voltage across the coil. A magnetic flux measuring method and apparatus for embodying the same have a high sensitivity in detecting a minute magnetic flux and an improved temperature characteristic because an output voltage little varies against a temperature variation. A magnetic flux measuring method and apparatus for embodying the same, when they are applied to a leakage flux flaw detection using a saturable magnetic flux sensor, is capable of expanding a measuring span of the magnetic flux sensor, thereby to improve a flaw detection performance.

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