Crystal Research and Technology
Cryst. Res. Technol. 36 (2001) 1329 - Abstract -

H. Sauermann, Ch. Stenzel*, S. Keesmann, B. Bonduelle**

TU Bergakademie Freiberg, Institut für Automatisierungstechnik, Freiberg, Germany
*Astrium GmbH, Space Infrastructure, Friedrichshafen, Germany
**Soterem, Castanet-Tolosan, France

High-Stability Control of Multizone Furnaces using Optical Fibre Thermometers

A high-stability temperature control system for a 1500°C multizone furnace has been developed and experimentally verified. It relies on the utilisation of optical fibre thermometers as precise temperature sensors. The strong thermal coupling between the zones requires an exact quantitative determination of the thermal exchange process. A holistic approach integrating theoretical and practical considerations has lead to a short-term stability of less than 0.02 K at a temperature level of 1500°C which is about one order of magnitude better than a temperature control based on thermocouples.

Keywords: multizone furnace, crystal growth, high-stability temperature feedback control, optical fibre thermometer, process modelling, simulation


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