Errortolerant calibration of dual sensor probes used in a turbulent wall boundary layer
Abstract
A computeraided calibration method for hot film probes is presented which tolerates statistical and some systematic errors, and which allows data evaluation in realtime. Essentially, the velocity is approximated by a power series at each yaw angle and for each sensor. A weighting function minimizes the influences of errors. At measurement time the anemometer voltages are roughly linearized. The digitized voltages are subjected to a combination of iteration and interpolation in order to compute the velocity components. The rms values of the two velocity components parallel to the wall, u and w, and of their partial derivatives with respect to time in a turbulent wall boundary layer are shown and used for comparison.
 Publication:

Experiments in Fluids
 Pub Date:
 1990
 Bibcode:
 1990ExFl....9R.285S
 Keywords:

 Calibrating;
 Flow Velocity;
 HotFilm Anemometers;
 Instrument Errors;
 Turbulent Boundary Layer;
 Wall Flow;
 Channel Flow;
 Digital Computers;
 Velocity Measurement;
 Weighting Functions;
 Instrumentation and Photography