Device for detecting incipient tears on a sheet during manufacture
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United States of America Patent
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Nov 29, 1988
Grant Date -
N/A
app pub date -
Jun 30, 1987
filing date -
Dec 31, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Device for detecting insipient cracks or tears on the edges (4) of a movingheet (5), of the type comprising: a light source (6), and a receiving cell for picking up the light transmitted by the source (6) through the sheet (5) moving between the source (6) and the cell, characterized in that: on the one hand, the light source (6) is a laser source; and on the other hand, the receiving cell (17) is an optoelectronic cell placed in such a way that the solid angle under which the serviceable surface of said cell (17) or of its image by an optical system, can be seen from the sheet, is less than 0.01 steradian.
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