Two signal processing methods for laser-Dopper perfusion velocimetry are presented. The methods are based on the calculation of the moments of the frequency power spectrum. The first uses Vω-filtering (ω is the frequency) with analogous electronics, the second uses signal autocorrelation with digital electronics. Comparison is made with a third instrument: a spectrum analyzer coupled to a computer, using Fourier transform tecniques. The performance of these setups (sensitivity, limit sensitivity and accuracy) are investigated. We propose a calibration standard for signal processors to be used for blood perfusion measurements. The analogous instrument proved to be the cheapest but the digital instrument had the best performance.
Koelink, M. H., Koelink, M. H., de Mul, F. F. M., Leerkotte, B. J. M., Greve, J., Jentink, H. W., ... Aarnoudse, J. G. (1994). Signal processing for a laser-Doppler blood perfusion meter. Signal processing, 38(2), 239-252. https://doi.org/10.1016/0165-1684(94)90143-0