Advances in Material Wide Range Temperature Determination by Dual-Color Emissivity Free Methodology in Long-Mid-near Infrared Ranges at Non-stationary Conditions

Dual color emissivity free methodology by thermography allows to obtain 2D (two-dimensional) temperature maps using local grey body hypotheses and narrowband filters. By a suitable pair of filters is possible the ratio between two thermal camera input signals that depend only on not emissive properties investigated surface. The aim this concise review paper summarize discuss developments applications from long- mid-near infrared ranges in wide range values dual-color thermographic technique has been analysed through use an analytical model based integration Planck’s law attenuated with transmission curves sensors, optics, filters, attenuators during last years. Moreover, applicability non-stationary conditions finalized materials mainly used aerospace plasma wind tunnel (PWT) re-entry are shown.