Device and method for the determination of diameters of crystals
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United States of America Patent
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-
Jan 22, 2002
Grant Date -
Nov 22, 2001
app pub date -
Aug 27, 1998
filing date -
Sep 3, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A device and process for the determination of the diameters of a crystal that is pulled from a liquified material. In this connection several video cameras are provided, each of which reproduces its own section along the vertical axis of the crystal or in a direction vertical to it. The image angles of the camera are laid out in such a way that the object to be reproduced completely fills the entire picture plane--at least in one direction. For objects with a small diameter; e.g., the crystal neck, a camera with a small image angle is used, while for objects with a large diameter; e.g., the crystal body, a camera with a large image angle is used.
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