Inventors:
Leo N. Altukoff - Battle Ground WA
Mike W. Mayer - Woodland WA
Barton V. White - Oregon City OR
Assignee:
Seh America, Inc. - Vancouver WA
International Classification:
G01B 1108
Abstract:
A calibration method and a calibration device for two-point cold calibration are suitable for calibration of any visual measuring system having a width analyzer. In particular, the method and the calibration device are used to calibrate a CCD camera in a visual measuring system used to monitor the diameter of a crystal rod being grown by a crystal growing apparatus using the well-known Czochralski process. The calibration method takes into account non-linear error and avoids the need to actually grow crystals for calibration. The calibration device is specifically designed for quick and accurate set-up.