Fig. 4

Calibrating graphite emitter temperature by means of short circuit current measurement. In the first step, short-circuit current is at a reference temperature T = 1085 °C, the melting point of copper, on top of the graphite strip emitter, as shown with the inset in (a). The short circuit current in (b) calibrates temperatures at T ≠ 1085C from the corresponding black body spectra at each temperature