Orthogonal shear stress measurement probe assembly for boundary layer flow

摘要

An orthogonal shear stress measurement probe assembly is provided for measurements away from a solid surface or a vehicle wall. The assembly includes a plurality of micron-sized floating element drag sensors mounted on a 2 mm stainless steel needle. The needle is in turn supported by a streamlined probe which provides both a support for the needle-drag sensor assembly and a conduit for electrical lead. The electrical leads connect the drag sensing elements, which contain piezo-resistive elements, to an external portion of a bridge. These resistive elements form one-half of a bridge, the remaining bridge elements, amplifiers, read-out circuits and power supply are located outside the probe.