Coin sensor

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United States of America Patent

PATENT NO 8561777
APP PUB NO 20090101469A1
SERIAL NO

11877437

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Abstract

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A coin sensor performs time-domain eddy-current testing using an inductance in one arm of a Maxwell bridge which is driven by a bipolar square wave having randomly-selected intervals between transitions, the output of the bridge being sampled at a high frequency. A processor stores a model which receives the drive signal and adjusts coefficients of the model so that the output matches the sampled measurements. Acceptance criteria are applied to the adjusted coefficients for coin classification purposes.

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Patent Owner(s)

  • CRANE PAYMENT INNOVATIONS, INC.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Baudat, Gaston Glenmoore, US 21 152
Furneaux, David Michael Reading, GB 8 59

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