Optical apparatus for determining the light exit angle from a ma

Details Optical apparatus for determining the light exit angle from a ma Optical apparatus for determining the light exit angle from a ma

1978-12-22

1981-02-03

Buczinski, Stephen C.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250563, G01N 2184, G01N 2188

Patent

active

042485371

ABSTRACT:
The optical apparatus basically comprises a cylindrical lens which gathers light reflected at various angles from a material surface and projects it onto a strip like curved mirror with its axis at right angles to the lens and which subsequently concentrates the light onto a number of photodetectors each of which is associated with a specified range of angles. The light is projected onto the material surface by a scanning device.
The arrangement is such that the angle of reflection is determined irrespective of the point along the scanning line at which the scanned beam strikes the material surface.
Various arrangements of different types of photodetector devices are described including a matrix of photodetectors, light conducting rods with photodetectors arranged at their end faces and photomultipliers.
The apparatus is particularly suitable for monitoring the production of strip metal in strip mills to detect faults in the metal surface.

REFERENCES:
patent: 3198951 (1965-08-01), Lentze
patent: 3618063 (1971-11-01), Johnson
patent: 3744915 (1973-07-01), Sick
patent: 3866054 (1975-02-01), Wolf
patent: 3919531 (1975-11-01), Bobel et al.
patent: 4054377 (1977-10-01), Gibson

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