| 摘要 |
Method and apparatus for nondestructively testing each incremental area of a ferromagnetic sample by first passing a steady magnetic flux field through an area in a first direction and producing an inspection signal in response thereto, and then passing a steady magnetic flux field through the same area in an orthogonal direction and producing a second inspection signal in response thereto. The magnitudes of the two inspection signals corresponding to a given incremental area are added to produce a composite signal whose magnitude is the sum of the two signals. The composite signal associated with a given incremental region is displayed on a visual presentation means at a location corresponding to the location of the incremental region on the ferromagnetic sample and with an indicia, such as color, that is a function of the magnitude of the respective composite signal.
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