LASER DOPPLER VELOCIMETER SYSTEM FOR TURBINE STATOR CASCADE STUDIES AND ANALYSIS OF STATISTICAL BIASING ERRORS

摘要

A laser Doppler velocimeter (LDV) built for use in the Lewis Research Center's turbine stator cascade facilities is described. The signal processing and self-contained data processing are based on a computing counter. A procedure is given for mode matching the laser to the probe volume. An analysis is presented of biasing errors that were observed in turbulent flow when the mean flow was not normal to the fringes.