Updated measurement method and uncertainty budget for direct emissivity measurements at UPV/EHU

TL;DR

This paper details upgrades to the UPV/EHU's emissivity measurement facility, including hardware and methodological improvements, validated through measurements of metals and ceramics, enhancing the reliability of emissivity data.

Contribution

It introduces a high-vacuum system, wider temperature range, refined measurement equation, updated uncertainty budget, and Monte Carlo method for improved emissivity measurements.

Findings

Validated measurements on metallic and ceramic materials

Demonstrated improved accuracy and reliability of emissivity data

Applicable methodology for similar measurement devices

Abstract

This work reports on the upgrades made to the direct emissivity measurement facility of the UPV/EHU. The instrumental improvements consist of, among others, a high-vacuum system and a wider temperature range (300-1273 K). Methodological developments include a refined measurement equation with updated parameters and a reworked ISO-compliant uncertainty budget, and a Monte Carlo procedure for accurate calculations of total emissivities from spectral data. These upgrades have been demonstrated and validated in measurements of both metallic and ceramic materials. The results obtained in this work are applicable to similar experimental devices for emissivity measurements in order to report reliable emissivity data.