| Zugriffsnummer | 17779 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Improved transient hot strip sensor design by means of FEM simulation |
| Autor(in); Institution |
Model, Regine; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
Stosch, Rainer; 3.1, Metrologie in der Chemie, PTB-Braunschweig
Hammerschmidt, Ulf; 1.7, Angewandte Akustik, PTB-Braunschweig
|
| Quelle/Jahr | Thermal conductivity 28 : thermal expansion 16 ; joint conferences, June 26 - 29, 2005, St. Andrews-by-the-Sea, New Brunswick, Canada:(2006), 298 - 308 |
| Herausgeber(in) |
Dinwiddie, Ralph B.
|
| ISBN | 1-932078-59-2 |
| Verlag | Lancaster, Pa.: DEStech Publications |
| Konferenzangaben | 28th International Thermal Conductivity Conference, St. Andrews-by-the-Sea, 26-29, June, 2005, Canada |
| Zusammenfassung | The transient hot strip (THB) technique is a well-established method to measure the thermal conductivity λ and the thermal diffusity α. It is, however, with the restriction to non-electrically-conducting materials - a restriction which can be overcome by inserting insulating layers (e.g. thin polymer foils) between the strip and the sample. Additionally, these foils also protect the sensor from mechanical destruction and atmospheric corrosion. They can, however, affect the THS signal adversely and deteriorate the uncertainty. The influence of the additional layers on the standard uncertainty in thermal conductivity of the method can be exactly determined by means of mathematical investigations via "virtual experiments". So far, we have no adequate analytic solution to the heat conduction equation at hand. Numerical methods such as the finite element method (FEM) are a very powerful mathematical tool to calculate the temperature distribution in composite materials. A THS signal can be calculated by FM simulations of a given setup including insulating foils. Using polyimide as insulating material and considering only those pairs of values for λsample and αsample which may occur in practice, the contribution to the uncertainty does not exceed 2% for layer thicknesses of 20 μm. The uncertainties estimated from FEM simulations have been verified experimentally by comparison with the reference material Pyrex. The results obtained are in excellent agreement with the simulated values. |
