Methodology for determination of the emissivity of metal powders and uncertainty quantification using an infrared camera and thermocouples

Experimental studies were carried out to determine the temperature and emissivity of 316L powder steel. It was found that the emissivity of powder steel varied from 0.33 to 0.58 in the temperature range from 59 °C to 900 °C. Based on the proposed methodology for quantitative assessment of temperature measurement uncertainty, it was established that the maximum value of the relative combined uncertainty in temperature measurement does not exceed 5.5%. Using the measure of agreement (normalized deviation), it was confirmed that the obtained results demonstrated the laboratory’s sufficient technical competence.