Abstract
Based on a transient thermal model of a point heat pulse, a dual-thermistorprobe, in which two thermistor beads serve as point heater and temperaturesensor respectively, has been developed for absolute measurement of thermaldiffusivity and conductivity. An experimental system with high sensitivity fortemperature change is designed to perform the measurement. Experimental resultsof samples are in agreement with the recommended values. The validation of theone-dimensional point source heat transfer is discussed, and the deviation fromthe theoretical model is negligibly small for the measurement. The estimatedmeasurement uncertainties are 3.5% and 5.3% for thermal diffusivity andconductivity respectively.
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