Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1981-10-29
1984-01-17
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
128725, 364510, G01F 166, A61B 508
Patent
active
044258054
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.
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Itoh Ayao
Ogura Ichiro
Noland Tom
Ruehl Charles A.
Tokyo Shibaura Denki Kabushiki Kaisha
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