Test device for dynamically measuring the degree of dirt accumul

Details Test device for dynamically measuring the degree of dirt accumul Test device for dynamically measuring the degree of dirt accumul

1977-11-29

1980-02-19

Corbin, John K.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

209534, 250562, 250572, 356430, G01N 2132

Patent

active

041892356

ABSTRACT:
A device for dynamically measuring the degree of dirt accumulation on bank-notes in which certain areas of the bank-note are illuminated and examined by means of a receiving unit. The light from a succession of adjacent elemental areas of a bank-note so illuminated is dependent upon the degree of dirt accumulation and is converted into a corresponding electric signal. The signal is analyzed to determine the number and amount of changes due to dirt accumulated in creases, and the analyzed signal is integrated to determine whether or not the number and nature of areas of accumulated dirt makes the ban-note unsuitable for further circulation.

REFERENCES:
patent: 3718823 (1973-02-01), Niikura et al.
patent: 3922557 (1975-11-01), Carnes, Jr.

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