Apparatus for optically testing objects such as security documents or labels
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United States of America Patent
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Jul 25, 1995
Grant Date -
N/A
app pub date -
Mar 24, 1993
filing date -
May 24, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to an optical sensor system, in particular for detecting diffuse low-intensity radiation as occurs in testing bank notes provided with luminescent features. In a preferred embodiment the sensor system comprises a flared optical fiber pipe and a processing optical system, whereby the narrow cross-sectional end of the fiber pipe can be used to detect the radiation from the test object at a large solid angle. Due to the change in cross section this radiation emerges from the fiber pipe at a much smaller angle that is coordinated with the aperture angle of the succeeding optical system.
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