Abstract
The static calibration of two MEMS calorimetric shear-stress sensors is performed. In a first step, a calibrationrange of τw = ±2 Pa is obtained in a two-dimensional channel-flow facility. The long-term repeatability of thesensors output, over a two-weeks period, is shown to be very good, with a standard deviation of less than 1% ofthe mean. In a second step, the sensors are calibrated in a large subsonic wind tunnel up to a velocity of 100 m/s,which corresponds to a range of τw = ±14 Pa of wall shear-stress that is closer to realistic values in low-speedaerodynamic flows. A method to measure the frequency response of the calorimetric sensors is also proposed. Atan average wall shear-stress of τw = 1 Pa, the sensors exhibit a cut-off frequency of approximately 1 kHz. Finally,the strong influence of the inter-beam distance on the static and dynamic characteristics of calorimetric sensors isdemonstrated.