Device for detecting ferromagnetic materials

Details Device for detecting ferromagnetic materials Device for detecting ferromagnetic materials

1980-05-05

1982-10-12

Schafer, Richard E.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324236, 324239, 102313, G01N 2772

Patent

active

043541569

ABSTRACT:
Apparatus for detecting ferromagnetic material such as is present in an explosive cartridge being loaded into a borehole, e.g., according to the method described in U.S. Pat. No. 3,986,430, which includes an inductance coil connected in series with a resistor, separately rectifies and amplifies the AC voltages across the coil and resistor and connects them in series opposition. The value of the balancing resistance is adjusted so that the two rectified voltages are equal and opposite when no ferromagnetic material is present. When the unbalance voltage exceeds a threshold value, a signalling device is actuated.

REFERENCES:
patent: 1708524 (1929-04-01), Tatz
patent: 2434347 (1976-10-01), Browne
patent: 2495627 (1950-01-01), Bovey
patent: 2575447 (1951-11-01), Gossick
patent: 3059749 (1962-10-01), Zinke
patent: 3394304 (1968-07-01), Green
patent: 3867689 (1975-02-01), Mori
patent: 3986430 (1976-10-01), Coursen
J. Ryder, Electronic Fundamentals and Applications, (4th ed., Prentice-Hall, 1970) pp. 102-105.
W. Hayt et al., Engineering Circuit Analysis (2nd. ed., McGraw-Hill, 1971) p. 122.

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