Optical apparatus and method for examining an object

Details Optical apparatus and method for examining an object Optical apparatus and method for examining an object

G - Physics

01

J

340/124.5

G01J 1/04 (2006.01) G01N 21/89 (2006.01)

Patent

CA 1271822

ABSTRACT Apparatus for detecting discontinuities in a radiation diffusing surface (10) such as paper comprising means for passing radiation to the surface and radiation collection means (19) for receiving the diffuse radiation (18) from a limited area of the surface (10), the radiation collection means includes means 26 to receive the diffuse radiation from a limited area only and from within predetermined angular limits other than normal to the surface, the radiation collection means (19) including means (26,32) for defining said predetermined angular limits by means of total internal reflection.

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