Low frequency phase shift coin examination method and apparatus

Details Low frequency phase shift coin examination method and apparatus Low frequency phase shift coin examination method and apparatus

1981-08-21

1983-08-16

Rolla, Joseph J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

194100R, 73163, G07F 302

Patent

active

043986269

ABSTRACT:
A method and apparatus for coin examination which subjects one side of a coin to a low frequency electromagnetic field from a transmitter inductor driven by an astable oscillator and frequency divider, receives a portion of the field on the other side of the coin with a receiving inductor, amplifies the output of the receiving inductor with a non-linear amplifier, and measures the phase shift between the signal driving the transmitter inductor and the amplifier output.

REFERENCES:
patent: 3059749 (1962-10-01), Zinke
patent: 3599771 (1971-08-01), Hinterstocker
patent: 3741363 (1973-06-01), Hinterstocker
patent: 3870137 (1974-03-01), Fougere
patent: 3907086 (1975-09-01), Willis
patent: 3966034 (1976-06-01), Heiman et al.
patent: 3995235 (1976-11-01), Kaplan
patent: 4086527 (1978-04-01), Cadot
patent: 4349095 (1982-09-01), Lewis
Wellsby, V. G., The Theory and Design of Inductance Coils, McDonald, London, 1960, p. 132.

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