Electronic proximity sensor which is responsive to induced resis

Details Electronic proximity sensor which is responsive to induced resis Electronic proximity sensor which is responsive to induced resis

1984-05-23

1986-04-01

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Combined

324207, 324234, 331 65, G01N 2712, G01R 3312, G01B 714, G08B 1900

Patent

active

045800979

ABSTRACT:
An improved electronic proximity sensor and crack detector that is primarily responsive to the induced resistance in a coil; including an LC resonating circuit that utilizes constant current and a DC power source. By sensing changes in the induced resistance, the invention detects various conditions of parts present and probe fault and can detect a crack in a rotating metal object that is in proximity with the probe. This is accomplished by sensing changes in the induced resistance that occur at the same frequency at which the metal object is rotating.

REFERENCES:
patent: 3319160 (1967-05-01), Wood et al.
patent: 3453532 (1969-07-01), Gardiner et al.
patent: 3609580 (1971-09-01), Thompson et al.
patent: 3688187 (1972-08-01), Loos
patent: 3743853 (1973-07-01), Dittman et al.
patent: 4042876 (1977-08-01), Visioli, Jr.

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