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:
Dec. 04, 1990
Filed:
Aug. 01, 1988
Dietrich Dopheide, Braunschweig, DE;
Michael Faber, Braunschweig, DE;
Guenter Taux, Braunschweig, DE;
Hans-Joachim Pfeifer, Ruemmingen, DE;
Gerhard Reim, Rothemuehle, DE;
Federal Republic of Germany, represented by the Federal Minister for, , US;
German-French Research Institute, Saint-Louis, FR;
Abstract
A laser Doppler anemometer with at least two laser beams pass to a region of a fluid flow containing particles. The scattered light is frequency shifted by the Doppler frequency resulting from the flow speed. The construction is very compact and permits a high signal-to-noise ratio for the measurement signals. The laser beams consist of high-frequency pulses, the frequency of the pulse sequence of which is a multiple of the Doppler frequency.