BURST DIGITAL CORRELATOR AS LASER-DOPPLER VELOCIMETRY SIGNAL PROCESSOR

摘要

A burst digital correlator (BDC) has been developed to obtain dow-velocity information at high data rates from wideband laser-Doppler signals of low signal-to-noise ratio (below 0 dB). Results with artificial signals show that, over a signal bandwidth of 5-120 MHz, the BDC has a measurement accuracy of less than 0.4% at a maximum data rate (number of measurements per second) of 208 kHz when 64 signal samples are correlated. The accuracy is better than 0.05% with a sample size of 512. The performance of the BDC was also evaluated in practical measurements of near-wall and strongly oscillatory recirculating flows. (C) 1996 Optical Society of America [References: 25]