Object detector with feedback which holds constant the product o

Details Object detector with feedback which holds constant the product o Object detector with feedback which holds constant the product o

1988-06-23

1989-09-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324239, 331 65, G01N 2772, G01R 3312

Patent

active

048684996

ABSTRACT:
An object detector uses product feedback in order to eliminate false indications of the presence of an object due to a change in operating frequency and/or transmitter coil current. The alternating current in the transmitter coil is measured with a capacitor, resistor and operational amplifier and rectified to develop a voltage which is compared with a reference voltage producing a constant voltage in the pickup coil. Additionally, combination feedback may be provided whereby nearly constant pickup coil voltage is maintained where a transmitting coil inductance change is associated with a geometrical change in the spacing between the transmitting coil and the pickup coil.

REFERENCES:
patent: 4613815 (1986-09-01), Christel, Jr.
patent: 4613830 (1986-09-01), Kamiya et al.

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