Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1986-10-29
1989-05-23
Rosenberger, Richard A.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
356 72, 356375, G01B 1110
Patent
active
048324965
ABSTRACT:
A method and apparatus for measuring the diameter of a monocrystal during crucible drawing determines the brightness profile at the melt/monocrystal change-over point. The spacial position of maxima in the brightness profile in relation to a reference point indicates the diameter. The brightness profile is obtained by optically scanning the melt/monocrystal change-over point with a mirror rotating about a horizontal axis, applying the optical beam reflected by the rotating mirror to a row of photosensitive elements in parallel with the axis, and analyzing the outputs corresponding to the brightness profile for determining the diameter.
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Leybold-Heraeus GmbH
Rosenberger Richard A.
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