Fig. 6: Flame impingement on plate.
From: Dispersive Meta-lens Thermometry for High-temperature Measurements

a Schematic of flame impingement on the plate. b Schematic of thermocouple installation locations. c Relative temperature difference between DMT and thermocouple. d–f Reconstructed surface temperature distribution with a temperature gradient for alumina, zirconia, and silicon carbide materials, respectively. The higher thermal conductivity, emissivity and greater \({{\boldsymbol{H}}}\) account for the lower temperature field in (f) comparing to the results in (d, e).