Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-01-15
1980-12-30
Sever, Frank
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
156601, 156608, 250574, 350319, 356387, 358101, 422249, G01N 226
Patent
active
042425891
ABSTRACT:
A system and method are disclosed for monitoring the growth of a crystalline-body from a liquid meniscus in a furnace. The system provides an improved human/machine interface so as to reduce operator stress, strain and fatigue while improving the conditions for observation and control of the growing process. The system comprises suitable optics for forming an image of the meniscus and body wherein the image is anamorphic so that the entire meniscus can be viewed with good resolution in both the width and height dimensions. The system also comprises a video display for displaying the anamorphic image. The video display includes means for enhancing the contrast between any two contrasting points in the image. The video display also comprises a signal averager for averaging the intensity of at least one preselected portions of the image. The value of the average intensity, can in turn be utilized to control the growth of the body. The system and method are also capable of observing and monitoring multiple processes.
REFERENCES:
patent: 3291650 (1966-12-01), Dohmen et al.
patent: 3958129 (1976-05-01), Clement et al.
patent: 4014656 (1977-03-01), Leibenzeder et al.
Mobil Tyco Solar Energy Corporation
Sever Frank
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