Method for measuring a diameter of a crystal

Details Method for measuring a diameter of a crystal Method for measuring a diameter of a crystal

1998-10-30

2000-08-29

Fourson, George

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

25055924, 348135, 356 30, G01N 1502

Patent

active

061112623

ABSTRACT:
A method and system for accurately measuring a diameter of a crystal including independently detecting a first intersection point and a second intersection point on a periphery of the crystal. The first intersection point and the second intersection point correspond to a respective intersection between a fusion ring formed on the periphery of the crystal and a light measuring line. The light measuring line may be produced by a camera, for example. In addition, the frequency components caused by shaking the crystal, are removed from the detected first intersection point and the detected second intersection point. In addition, a timing difference between when the first detected intersection point and the second detected intersection point intersect the light measuring line is determined. Finally, an interval between the detected first intersection point and the detected second intersection point using the determined timing difference is obtained.

REFERENCES:
patent: 4794263 (1988-12-01), Katsuoka et al.
patent: 4926357 (1990-05-01), Katsuoka et al.
patent: 5105091 (1992-04-01), Igarashi et al.
patent: 5138179 (1992-08-01), Baba et al.
patent: 5170061 (1992-12-01), Baba

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