Figure 2.

The original time series curves of WIRIS camera observations. Dark blue thick curve: Readings of the average measured temperature over time when imaging a round-shape blackbody calibrator at 55 °C, as recorded by WIRIS over 3 h after switching on the camera. During the operation of the camera, the emissivity of the measured object was adjusted from the default value of 0.95 to 0.98, being consistent with that of the adopted blackbody calibrator (Ε_BB = 0.98). The thin red curve represents the development of the standard deviation (STD) of the temperature readings. The non-uniformity corrections (NUCs) every 30 min are shown as green lines.