Methods of measuring currency limpness

Details Methods of measuring currency limpness Methods of measuring currency limpness

1998-12-07

1999-09-21

Chapman, John E.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25055904, 73159, 902 7, 209534, 209578, 209579, 209587, 209588, 209599, G01N 2159, G07D 700, B07C 5342

Patent

active

059557419

ABSTRACT:
Measuring the limpness of a note is necessary to separate a worn note out of circulation. Several methods are disclosed which can be used either alone or in combination to test for limpness. One method measures the note's ability to reflect light or transmit the light. Another method measures the response of the note to an acoustic wave. Another method measures the note's deflection to a pressure or force. Yet another method measures the dielectric value of the note when placed between the plates of a capacitor. A final method involves measuring the thermal conductivity of the note. In each case, a limp note will produce distinguishable results from a stiff note.

REFERENCES:
patent: 3782543 (1974-01-01), Martelli et al.
patent: 3916194 (1975-10-01), Novak et al.
patent: 4587434 (1986-05-01), Roes et al.
patent: 4723072 (1988-02-01), Naruse
patent: 5502312 (1996-03-01), Lorenzo

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