An investigation of LDV velocity bias correction techniques for high-speed separated flows

An experimental study of the effects of velocity bias in single realization laser Doppler velocimetry measurements in a high-speed, separated flow environment is reported. The objective of the study is to determine a post-facto correction method which reduces velocity bias after individual realization data have been obtained. Data are presented for five velocity bias correction schemes: inverse velocity magnitude weighting, interarrival time weighting, sample and hold weighting, residence time weighting, and the velocity-data rate correlation method. These data were compared to a reference measurement (saturable detector sampling scheme); the results show that the interarrival time weighting method compares favorably with the reference measurement under the present conditions.