Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Heraeus Quarzglas Gmbh & Co Kg

Thomas Bernard

Oliver Ganz

Thomas Bogdahn

Harald Hain

A method for using a temperature control loop in order to further develop process control during elongation of a cylindrical preform such that a component strand with high dimensional accuracy can be drawn even in the presence of temperature-effective defects during the elongation process: (a) the continuous measurement of a first temperature value, T, at an upper measuring point on the surface of the cylindrical preform; (b) the continuous measurement of a second temperature value, T, at a lower measuring point; (c) calculation of a temperature distribution in the region between the measuring points Tand T, and determination of a modelled deformation temperature, T, using an algorithmic model taking with first and the second temperature values as model input parameters, and the modelled deformation temperature, T, as a regulating variable and the heating-zone temperature Tas a manipulated variable for the temperature-control loop.

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Karlsruhe, Germany

Thomas Bernard