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:
May. 06, 1980
Filed:
Aug. 31, 1977
Klaus Hartmann, Munich, DE;
Wolfgang Siersch, Taufkirchen, DE;
Abstract
A flow velocity meter is described suitable for measuring the mean flow velocity of a medium flowing along a duct using optical means which generates first and second beams of light each in the form of a relatively shallow wide band which traverse the duct across first and second spaced apart transverse planes which are arranged substantially at right angles to the mean flow direction. Light beams emerging from the duct are received on respective photoelectric detectors the output signals of which are essentially identical but relatively displaced because of the time required for the medium to flow between the two planes. By processing the signals in a correlation circuit this time is established and is used to produce an output proportional to the mean flow velocity of the medium between the two planes. The correlation circuit used is based on digital techniques.