Magnetic field strength threshold indicator for use in a magneti

Details Magnetic field strength threshold indicator for use in a magneti Magnetic field strength threshold indicator for use in a magneti

1992-09-11

1994-05-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Calibration

324216, 324228, 324258, G01R 3500, G01R 3302, G01N 2784

Patent

active

053111265

ABSTRACT:
Field strength of an electromagnet is monitored at a threshold with a coupling coil positioned to monitor magnetic flux in a leg of an electromagnet. In the context of magnetic particle inspection for surface flaws (e.g. cracks) in ferromagnetic materials, sensing magnetic flux in a portion of a magnetic circuit including the material being inspected provides a continuous direct indication of whether or not the magnetic field strength produced is sufficient for reliable inspection to be performed. Since the magnetic flux in the electromagnet will be reduced with increases in reluctance of the magnetic circuit, the continuous monitoring of magnetic field strength also effectively monitors correct inspection technique by the magnetic particle inspection methodology.

REFERENCES:
patent: 2311715 (1943-02-01), Thorne
patent: 3309690 (1967-03-01), Moffitt
patent: 3857081 (1974-12-01), Gebelein, Jr.
patent: 4634969 (1987-01-01), Edlin et al.
patent: 4635142 (1987-01-01), Haugland
patent: 4956600 (1990-09-01), Severinsky
Hoel, J. E., Magnetic Reluctance, Film Thickness Gauge IBM Tech. Discl. B., vol. 13, No. 10, Mar. 1971, pp. 3048-3049.

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