Research Group of Prof. Dr. M. Griebel
Institute for Numerical Simulation

  author = {M. Korzen and R. Schriever and K.-U. Ziener and O. Paetsch
		  and G. W. Zumbusch},
  title = {Real-Time 3-D Visualization of Surface Temperature Fields
		  Measured by Thermocouples on Steel Structures in Fire
  booktitle = {Proceedings of International Symposium Local Strain and
		  Temperature Measurements in Non-Uniform Fields at Elevated
  pages = {253--262},
  year = {1996},
  editor = {J. Ziebs and J. Bressers and H. Frenz and D. R. Hayhurst
		  and H. Klingelh\"{o}ffer and S. Forest},
  publisher = {Woodhead Pub},
  address = {Camridge, UK},
  ps = { 1},
  pdf = { 1},
  annote = {unrefereed},
  abstract = { The aim of this paper is to present some advanced
		  techniques for monitoring thermocouples in the field of
		  fire engineering. In a fire test structural elements like
		  columns, beams or slabs, which are insulated by a fire
		  protection material, are subjected to mechanical as well as
		  thermal loadings. Whereas the mechanical loading is
		  constant the mean temperature in the furnace varies - due
		  to oil or gas burners - nearly monotonically as a function
		  of time within 90 minutes between room temperature and 1000
		  $^0C$. New technical standards as well as research purposes
		  require the monitoring of 30 to 60 thermocouples and more.
		  Although versatile computer based data acquisition systems
		  including necessary signal condition front-ends exist for
		  handling such an amount of data at any required rate, there
		  is a lack in representing these data during the test in
		  their geometrical context, i.e. as a property of the steel
		  surface. The method, which is proposed by the authors, uses
		  some recent developments in computer graphics and numerical
		  mathematics. By this method the monitoring of the
		  thermocouples is understood as a representation of a
		  time-dependent 1-dimensional field, which is based on
		  discrete measured values on a curved surface in 3-D space.
		  For this solution CAD and data visualization tools are
		  under testing, which are originally designed for other
		  purposes. In praxis a geometry file has to be created
		  before the fire test for the structural element under
		  consideration including the information on the position of
		  the thermocouples. This file is used as an appropriate
		  triangulation of the surface of the specimen. The
		  corresponding grid together with the actual temperature
		  readings are the basis for the real time visualization of
		  the temperature field by continuous colors or iso-lines.}