Apparatus for measuring crystal diameter

Details Apparatus for measuring crystal diameter Apparatus for measuring crystal diameter

1987-10-19

1988-12-27

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250577, 156601, 422249, C30B 1526, G01B 1108

Patent

active

047942630

ABSTRACT:
An apparatus for measuring the diameter of a crystal in which an optical sensor scans along a sensing line which crosses at one point a luminous ring formed at the interface between a crystalline rod and a melt; the picture element position corresponding to a maximum luminance is discriminated when the optical sensor scans; the mean value of the picture element position is calculated over at least one revolution of the crystalline rod; and the diameter D of the crystalline rod at a portion thereof interfacing with the melt is calculated from the mean value and the level of the melt. Similarly, the minimum crystal diameter can be calculated by obtaining the picture element position corresponding to the minimum crystal diameter instead of obtaining the mean of the picture element position.

REFERENCES:
patent: 3958129 (1976-05-01), Clement et al.
patent: 4207293 (1980-06-01), Scholl et al.
patent: 4617173 (1986-10-01), Latka
patent: 4710258 (1987-12-01), Latka

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