Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1973-11-29
1976-08-31
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
252 6252, G01R 3312
Patent
active
039783987
ABSTRACT:
A method for nondestructive magnetic particle inspection of an object or part, especially parts having complex configurations, for detection of defects and metallurgical conditions therein, by placing a novel magnetic recording medium in the form of a magnetizable preferably putty-like material on the surface of the object, magnetizing the object and such putty-like material in contact with the object, and recording on such magnetizable putty-like material, magnetic indications of such defects and metallurgical conditions, removing the so-magnetized putty-like material from the object, placing a viewing device on the area of the magnetized putty-like material previously in contact with the object, such device preferably being one containing a suspension of weakly magnetic crystals in a transparent liquid vehicle, and having a transparent portion to permit viewing such suspension, and viewing through such device the outlines and indications of the defects and metallurgical conditions in the object, produced by the reorientation of the magnetic particles of the suspension, and corresponding to the magnetic indications recorded on the magnetized putty-like material. A novel rubbery to putty-like magnetic recording medium is preferably in the form of a silicone polymer containing magnetic particles.
REFERENCES:
patent: 2764733 (1956-09-01), De Forest
patent: 3013206 (1961-12-01), Youngquist et al.
Suchow, L., New Method for Making Magnetic Fields Visible, Jour. of Appl. Physics, Feb. 1958, pp. 223-224.
Corcoran Robert J.
Humphries L. Lee
Rockwell International Corporation
Silberberg Charles T.
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