G - Physics – 01 – N
Patent
G - Physics
01
N
340/124.6
G01N 21/89 (2006.01)
Patent
CA 1259390
ABSTRACT A beam of radiation is scanned across a sheet 13 and is either reflected therefrom or transmitted therethrough. Faults in the sheet 13 deflect, scatter or alternate the beam which is then passed to a retroreflector screen 24 where it forms an image 15. Analysis of the image 15 is carried out via the scanning means 22 to determine the faults in the sheet 13.
491434
Macrae & Co.
Sira Limited
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