Investigation of High-Temperature Normal Infrared Spectral Emissivity of ZrO Thermal Barrier Coating Artefacts by the Modified Integrated Blackbody Method.

Zirconium oxide (ZrO) is widely used as the thermal barrier coating in turbines and engines. Accurate emissivity measurement of ZrO coating at high temperatures, especially above 1000 °C, plays a vital role in thermal modelling and radiation thermometry. However, it is an extremely challenging enterprise, and very few high temperature emissivity results with rigorously estimated uncertainties have been published to date.

Integrating-sphere-free reflectometry of blackbody cavity emissivity using the ratio of hemispherical-given solid angle reflections.

Blackbody cavity reflectivity is normally measured using an integrating sphere to collect hemispherical reflected radiation from a blackbody opening when illuminated by a directional light source. The challenge of taking this method without an integrating sphere arises for blackbody cavity emissivity measurement in satellites due to space constraints. The ratio of hemispherical-given solid angle reflections is proposed to calculate the total reflected power from a blackbody cavity by multiplying a measurable reflected power in a given solid angle.