Radiant energy – Inspection of solids or liquids by charged particles – Including a radioactive source
Patent
1987-05-19
1989-04-04
Howell, Janice A.
Radiant energy
Inspection of solids or liquids by charged particles
Including a radioactive source
2503581, 2503601, 209534, G01N 2316
Patent
active
048188719
ABSTRACT:
The present invention relates to a process for the detection of superimposed sheets, the apparatus making it possible to perform this process and the application thereof to bank notes. The process for detecting superimposed sheets by evaluating their surface mass is characterized in that it comprises the stages of passing the sheets oriented in the direction of their width between a beta particle source and a Geiger-Muller counter, counting the number of particles received by the counter by measuring the frequency F.sub.g of the pulses from the Geiger counter to determine the surface mass and eliminating the notes having a high superimposition level by comparison with a limit value.
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Carisey Camille
Dumesnil Patrice
Dupoy Marc
Mongault Jacques
Bull S.A.
Commissariat a l''Energie Atomique
Howell Janice A.
Rauchholz William F.
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