Two-colour Pyroreflectometry

In optical pyrometry, the lack of knowledge of thermo-radiative properties is the major obstacle to accessing the actual temperature. Based on the hypothesis of identical reflection indicators for two close wavelengths, and relying on simultaneous measurements of luminance temperatures and bidirectional reflectivities, two-color pyroreflectometry removes this obstacle for opaque bodies. Validation and experimental results demonstrate the relevance of the method and the maturity of the associated systems.