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Title: Crystal face temperature determination means

An optically transparent furnace having a detection apparatus with a pedestal enclosed in an evacuated ampule for growing a crystal thereon is disclosed. Temperature differential is provided by a source heater, a base heater and a cold finger such that material migrates from a polycrystalline source material to grow the crystal. A quartz halogen lamp projects a collimated beam onto the crystal and a reflected beam is analyzed by a double monochromator and photomultiplier detection spectrometer and the detected peak position in the reflected energy spectrum of the reflected beam is interpreted to determine surface temperature of the crystal. 3 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
6815283
Assignee:
Dept. of Energy, Washington, DC (United States) NVO; EDB-94-169441
Patent Number(s):
US 5365876; A
Application Number:
PPN: US 8-011634
Contract Number:
AC08-88NV10617
Resource Relation:
Patent File Date: 1 Feb 1993
Research Org:
EG & G Energy Measurements Inc
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; CRYSTALS; TEMPERATURE MEASUREMENT; CRYSTAL GROWTH; MEASURING METHODS; TEMPERATURE GRADIENTS; VISIBLE RADIATION; ELECTROMAGNETIC RADIATION; RADIATIONS 440500* -- Thermal Instrumentation-- (1990-)