System for detecting metal in articles using phase change of det

Details System for detecting metal in articles using phase change of det System for detecting metal in articles using phase change of det

1988-08-17

1990-08-14

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, 324239, G01N 2772, G01R 3312

Patent

active

049490370

ABSTRACT:
In a system for detecting stray metal in an article, the article passes through an alternating magnetic field generated from a coil. The magnetic field is detected by coils which generate induced voltages and the difference between the induced voltages is applied to a tuning and phase-shift circuit. An output signal having a phase, generated from the tuning and phase-shift circuit, is detected by a detector and the peak level of the detected output signal is held in a peak hold and comparing circuit. A plurality of the peak levels are stored in a memory circuit and are processed by a CPU to determine the preferred phase of the output signal. The tuning and phase-shift circuit is so switched as to apply the preferred phase to the output signal.

REFERENCES:
patent: 4325027 (1982-04-01), Dykstra et al.
patent: 4651094 (1987-03-01), Wallace
patent: 4677384 (1987-06-01), Payne

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