Emissivity is one of the parameters that most influence measurements by infrared
thermography, as it rules the effective radiation emitted by the surface, regarding the black
body. For in situ measurements, the surface emissivity is defined using black tape with
known emissivity. The tape is glued over a portion of the surface under study and its
temperature is measured considering the tape emissivity. The surface emissivity is adjusted
by equating the temperatures of the tape and of the surface near it. In this work the accuracy
of this method was evaluated, by comparison with measurements made with an emissometer.
The emissivity of ten different materials commonly used in buildings was assessed ,
considering a black tape of well-known emissivity.
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