Computational Methods for the Determination of Thermophysical Properties in Pulse-Heating Experiments

Two alternative methods to evaluate thermophysical properties (heat capacity and hemispherical total emissivity) directly from the experimental data in pulse-heating experiments without the need to compute explicitly the heating and cooling rates are presented. The methods can be applied to a set of data originating from different experiments, providing with a single computation an estimate of the thermophysical property as a function of temperature. The first method is based on an integration of the basic equations of the pulse technique. In the second method a stochastic approach (the Kalman filter) is applied to the set of experimental data. The mathematical formulation of these computational methods is presented and the methods are intercompared by the use of a 'set of experimental measurements on niobium in the temperature range 1200-2600 K

Ten Years of Parameter Estimation Applied to Dynamic Thermophysical Property Measurement

The parameter estimation theory is considered the best way to estimate thermo-physical properties from dynamic experiments. This approach deals with measurement and model errors in a statistical context and provides useful information to optimize the experiment. The experience gained in ten years of implementation of inverse algorithms based on the parameter estimation theory (OLS, MAP, and Kalman filtering) is summarized and presented. Several examples of estimation of thermophysical properties using transient and pulse techniques are reported and discussed. The thermal conductivity, specific heat capacity, and total hemispherical emissivity of different materials (light insulators, Pyrex, and niobium) are presented and compared with data obtained with consolidated techniques and with literature data

Collegamento di personal computer con calcolatori Hewlet-Packard attraverso una linea seriale RS232

SIGLEITItal

Long term stability of a transfer standard pyrometer

Draft report of the contractSIGLEITItal

Pirometria veloce sotto 1000 K: proposte di ricerca

SIGLEITItal

Long term performance of a transfer standard pyrometer

Synthesis report of the contracts n. 1465; 3112SIGLEITItal