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:
Jan. 17, 1984
Filed:
Oct. 29, 1981
Ichiro Ogura, Yokohama, JP;
Ayao Itoh, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
At a pair of recesses formed on an inner wall of a conduit along a line slanted with respect to the flow direction of a respiration gas flowing through the measuring conduit, a pair of ultrasonic transducers are provided with their ultrasonic transmitting and receiving surfaces oppositely facing each other along the above line. A propagating time T1 from the time when one of said ultrasonic transducers is driven to produce ultrasonic wave until the other transducer receives the ultrasonic wave, and a propagating time difference .DELTA.T are measured. A digital processor calculates a flow velocity of the respiration gas using the measured values in accordance with the following equation ##EQU1## where d is a distance between the pair of transducers free from an effect by the flow velocity of the gas; L a distance influenced by the flow velocity of the same; .theta. an angle of the direction of the respiration flow with respect to a line coupling the pair of transducers; .DELTA.T the propagating time difference; and Ta a value obtained by substituting the propagating time difference .DELTA.T from the double (2 T1) of the ultrasonic propagating time T1.