Method and apparatus for measuring flow rate, particularly of blood
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United States of America Patent
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Apr 15, 1997
Issued Date -
N/A
app pub date -
Aug 2, 1995
filing date -
Jul 2, 1993
priority date (Note) -
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Abstract
A method for measuring the flow rate of a liquid, particularly of blood, in which the frequency shift of a laser beam reflected from the liquid is determined according to the optical Doppler effect. This method and the apparatus provided for its implementation are designed so as to enable reliable measurement of the flow rate of the flowing medium which is resolved both spatially and with respect to time. In accordance with the invention at each scanning point a number of N measured values is collected corresponding to the reflected light, N being a whole number equal to or larger than 2; the Doppler shift is calculated from the time variation of the thus measured intensity of the reflected light at the respective scanning points, and the flow rate is determined from the Doppler shift at each point of the scanning pattern.
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