Temperature determination by thermography: emissivity measurement versus estimation algorithms

Non-contact temperature measurement is very important for the control and inspection in different sectors of industry involving harsh environments, and an accurate measurement depends crucially on the emissivity determination. This work compares two possible methodologies to obtain accurate temperatures. Firstly, the emissivity is rigorously characterised in the laboratory and later used to correct the thermographic images. Secondly, by means of the so-called TES algorithms, approximations of both temperature and emissivity are obtained. Finally, both results are compared and the accuracy obtained together with the operational cost of the two processes and its readiness for industrial implementation are discussed

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