The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 15, 1997
Filed:
Aug. 02, 1995
Gerhard Zinser, Speyer, DE;
Georg Michelson, Baiersdorf-Hagenau, DE;
Bernhard Schmauss, Erlangen, DE;
Heidelberg Engineering, Optische Messsysteme GmbH, Heidelberg, DE;
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.