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automatic control of silicon melt levelA new circuit, when combined with melt-replenishment system and melt level sensor, offers continuous closed-loop automatic control of melt-level during web growth. Installed on silicon-web furnace, circuit controls melt-level to within 0.1 mm for as long as 8 hours. Circuit affords greater area growth rate and higher web quality, automatic melt-level control also allows semiautomatic growth of web over long periods which can greatly reduce costs.
Document ID
19810000097
Document Type
Other - NASA Tech Brief
Authors
Duncan, C. S.
(Westinghouse Electric Corp.)
Stickel, W. B.
(Westinghouse Electric Corp.)
Date Acquired
August 11, 2013
Publication Date
September 1, 1982
Publication Information
Publication: NASA Tech Briefs
Volume: 6
Issue: 1
ISSN: 0145-319X
Subject Category
FABRICATION TECHNOLOGY
Report/Patent Number
NPO-15487
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.