Abstract
A calibration procedure for wall shear-stress sensors based on continuum isothermal compressible e ow has been developed. Microfabricated electromechanical e oating element sensors for direct measurement of wall shear stress are chosen for calibration. The calibration equation states a linear relation between the channel height and the calibrated shear stress, resulting in an overall calibration uncertainty as a result of inaccuracy in the channel height measurement. A novel microstrip technique using basic principles of microwave engineering is used to measure the channel height with a high degree of accuracy. The uncertainties involved in the measurement of all of the parameters that are related in any way to the calibration equation are identie ed, measured, evaluated, and integrated into the equation to obtain a complete error analysis of the calibration procedure. The calibration of shear-stress sensors is successfully completed with an overall accuracy of 2%.
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