Measuring and testing – Vibration – By mechanical waves
Patent
1983-06-27
1985-05-28
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73627, 73159, G01N 2904
Patent
active
045192499
ABSTRACT:
For the detection of defects such as tears or fold lines in banknotes, for example, continuous wave ultrasonic energy is directed by a transmitter to a flow path for the notes and ultrasonic energy reflected from the notes or transmitted through tears or holes in the notes is converted by a receiver into an electric signal. A signal analyzing circuit is responsive to changes in the output of the receiver during the passage of the banknote. In the ultrasonic inspection area, the note may be passed over rollers with flared ends to cause a tear to open and allow the passage of ultrasonic energy. In a reflective system the note may be passed over a roller to cause one or both of the adjacent edges of a tear to leave the roller surface. The electric signal is analyzed for components indicative of a defect; for tear detection, a spike filter and a circuit for distinguishing tear signals from end-of-note signals may be used. For crinkle detection, the received signal may pass through a differentiator, an integrator and a threshold comparator.
REFERENCES:
patent: 2769158 (1956-10-01), Schultz
patent: 3477288 (1969-11-01), Krcal et al.
patent: 4080839 (1978-03-01), Schaiber et al.
patent: 4111053 (1978-09-01), Geithman et al.
patent: 4446735 (1984-05-01), Weilacher
"Soviet Inventions Illustrated", Article A3846C/02, Week C 02, 20 Feb. 1980, Section R16 & SU-A-658466.
Ciarlante Anthony V.
De La Rue Systems Limited
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