A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
354/22, 354/32
A61B 5/02 (2006.01) A61B 5/026 (2006.01) G01P 5/00 (2006.01)
Patent
CA 1235223
ABSTRACT OF THE DISCLOSURE A method and apparatus for measuring the velocity of moving particles such as red blood cells in a tissue sample is disclosed, characterized by digital processing techniques and autocorrelation. The moving particles are illuminated to produce a spread spectrum optical signal resulting from the Doppler shift occurring when photons are scattered by the moving particles. A spread spectrum electrical signal corresponding with the optical signal and containing spectral and noise components is generated from the optical signal. The electrical signal is filtered to produce the bandpass and DC signals which are subsequently converted to digital form. A first autocorrelation function is calculated from the bandpass signal and a noise autocorrelation function is calculated from the DC signal. The first and noise autocorrelation functions are compared to produce an autocorrelation function free of a noise component. From the autocorrelatio function, the mean frequency of the electrical signal is linearly calculated, the mean frequency corresponding with the average velocity of the moving particles.
496132
Adrian Ronald J.
Borgos John A.
Seaby & Associates
Tsi Incorporated
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