Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1978-05-17
1980-05-20
Rolinec, Rudolph V.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324327, 331 65, 331109, 331117R, 331183, G01V 308
Patent
active
042041600
ABSTRACT:
A metal detector is disclosed. The detector comprises oscillator circuit means comprising a first transistor, a second transistor, adjustable resistor means coupled to the emitter of the first transistor, and inductor means arranged to control the conductive state of the second transistor. The oscillator circuit means is arranged to generate an electromagnetic field and the second transistor is arranged to provide an output signal in response to and corresponding to any disturbance of the electromagnetic field caused by the presence of a metal article in the electromagnetic field. The detector also comprises indicating circuit means arranged to receive the output signal and to indicate the presence of the metal article in response to the output signal, regulating circuit means arranged to receive the output signal and to control the resistance value of the adjustable resistor means, the regulating circuit means comprising charging circuit means comprising an output terminal, at least one capacitor, and discharging means coupled to the at least one capacitor to discharge the at least one capacitor, and regulating transistor means coupled to the output terminal of the charging circuit means and arranged to reduce the resistance value of the adjustable resistor means only during the presence of the output signal provided by the second transistor, precharging means coupled to the charging circuit means to precharge the charging circuit means, and power supply means selectively connectible to the precharging means and to the oscillator, indicating and regulating circuit means.
REFERENCES:
patent: 2807720 (1957-09-01), Charles
patent: 3213390 (1965-10-01), Faith et al.
patent: 3453532 (1969-06-01), Gardiner
patent: 3688186 (1972-08-01), Judd
patent: 3714563 (1973-01-01), Voll
Rolinec Rudolph V.
Snow Walter E.
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