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INVESTIGATION OF HALL EFFECT DEVICES FOR FLAW DETECTION IN FERROUS MATER2ALS
FRANKFORD ARSENAL PHILADELPHIA PA
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An investigation of the state of the art in the development of Hall generators as applied to nondestructive testing has shown that the field of activity in both basic and applied work is limited but increasing very rapidly. Two magnetometer instruments are commercially available which can be used for the detection of magnetic leakage fields caused by cracked ferromagnetic materials. The limitations of various methods in crack detection are discussed with emphasis on the need for an effective flaw depth measurement technique. Experimental procedures and test results are described for various modes of operation such as dc, ac, and pulse power control current with a discussion of sensitivity, resolution and stability factors. Author
APPROVED FOR PUBLIC RELEASE