Abstract
A periodic radiometric technique for determining the total emissivity of insulating materials at moderate temperatures is presented. The radiometric technique involves a multifrequency modulation of the front-side temperature of the sample. This method needs two measurements: one on the studied sample, the other one on a modulated thin reference. The infrared output signal of the other side (the back side) as well as the front-side temperature of the sample are measured. The measured signals are fitted with a temperature-modulated conduction model, providing the emissivity without surface-temperature measurement. As an experimental validation 25 measurements are carried out on a PVC sample 5 mm thick coated with aluminium paint. The results are consistent with the results obtained by two other methods, the monofrequency radiometric method and the integrating directional measurements.
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