Velocity bias errors occur when turbulent flows are measured by laser Doppl
er anemometry (LDA). Measurements have been done for the backward facing st
ep how by LDA and particle image velocimetry in order to evaluate the veloc
ity bias correction method that should be applied for the separated flow da
ta measured by LDA. Results indicated that the separated flow can be measur
ed by LDA with reasonable accuracy by applying one of the bias correction m
ethods, called the "transit time weighting method".