Method for determining quality of U.S. currency

Details Method for determining quality of U.S. currency Method for determining quality of U.S. currency

1979-10-04

1981-03-10

Clark, Conrad J.

Optics: measuring and testing

For light transmission or absorption

By comparison

209534, 250559, 271263, G01N 2101, G01N 2189, B65H 712

Patent

active

042550572

ABSTRACT:
An apparatus for detecting quality of currency or the like. Signals representative of the transmissivity and reflectivity of a bill are subtracted from a signal representative of unity. The resulting signal, which is representative of absorptivity of light by the bill, is accumulated over the length of the bill and compared to a reference to produce digital signals representative of fit or unfit bills.

REFERENCES:
patent: 3496370 (1970-02-01), Haville
patent: 3827808 (1974-08-01), Cho
patent: 3976198 (1976-08-01), Carnes, Jr. et al.

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