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In this paper, we study the influence of annealing on the performance of Resistive Temperature Detectors made from Nickel thin films. The aimed application is heat flux sensing. The substrate is made of Borofloat glass with a Chromium adhesive layer. Several annealing temperatures between 150°C and 300°C are applied to this assembly. The thin films as deposited and after annealing are analyzed through SEM images. The evolution of the resistance and the temperature coefficient of the sensor are discussed. An annealing temperature is selected that ensures the repeatability of measurements.

In this paper, we present a gradient based heat flux sensor. It consists of platinum resistances deposited on a glass substrate. The dimensions of are 5 mm × 5 mm × 0.5 mm. The sensor can be embedded in a dedicated housing. The calibration test bench, method, uncertainties and results are presented. This sensor can measure heat fluxes in steady state mode up to 8000 W/m2 and can withstand 100 °C. The results were found to be consistent with reference heat fluxes. The operational error caused by the sensor is addressed by numerical parametric studies. The influence of different wall thermal properties is studied. Different radiative and convective conditions are also simulated. Finally, the influence of connecting wires is analyzed. In some specific cases, the sensor does not influence the measurement. In all other cases, correction factors are derived. It is shown that radiative heat transfer and connecting wires can have a strong influence on correction factors.