Method of and device for diameter measurement used in automatica

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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250577, 156601, G01N 2186, G01V 904

Patent

active

051381796

ABSTRACT:
Disclosed are a method of and a device for crystal diameter measurement in an apparatus for automatically controlling single crystal growth by the CZ technique. In the diameter measurement method, a growing region of a single crystal 32 is photographed by a camera 38, and an outer diamter Do of a luminous ring image 70 having a luminance above a reference value E is detected from a video signal supplied from the camera 38, the diameter Do thus detected being used for crystal diameter control. The crystal diameter measuring device comprises: a camera 38 for photographing a growing section of a single crystal 32 and supplying a video signal; devices for detecting a maximum video signal value with respect to one scanning line or more; a device for obtaining a reference value E corresponding to the above-mentioned maximum value; devices for binary-coding the video signal in comparison with the reference value E; and a device for detecting the outer diameter Do of a luminous image from a binary image obtained by the binary-coding.

REFERENCES:
patent: 3998598 (1976-12-01), Bonora
patent: 4617173 (1986-10-01), Latka
patent: 4710258 (1987-12-01), Latka
patent: 4794263 (1988-12-01), Katsuoka et al.
patent: 4918520 (1990-04-01), Katsuoka et al.
patent: 4926357 (1990-05-01), Katsuoka et al.
patent: 4973377 (1990-11-01), Katsuoka et al.
IBM Technical Disclosure Bulletin, vol. 24, No. 11 B, Apr. 1982, K. M. Kim et al., "Technique for Monitoring Diameter Variation in Czochralski Crystal Growth," pp. 6038-6039.

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