Method and device for measuring the flow velocity of media by me

Details Method and device for measuring the flow velocity of media by me Method and device for measuring the flow velocity of media by me

1975-06-26

1977-03-15

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 166

Patent

active

040117537

ABSTRACT:
Ultrasonic waves, produced from electric signals at one end of a measuring section having the length s, are transmitted through the measuring section and re-transformed into electric signals at the opposite end of the measuring section. The transit time T.sub.1 of the ultrasound in the flow direction of the media, and the transit time T.sub.2 of the ultrasound in the opposite direction, are determined, digitized, inverted into their respective reciprocal values 1/T.sub.1 and 1/T.sub.2 to establish the difference 1/T.sub.1 - 1/T.sub.2 whereby the flow velocity v = s/2 (1/T.sub.1 - 1/T.sub.2) may be determined. The device includes a rectilinear conduit section through which the media flows and preferably made of a glass ceramic material having a zero temperature coefficient. Ultrasonic transducers are located at the opposite ends of the measuring section and have concave surfaces which face each other and are located in mutual confocal relation. The ultrasonic transducers may operate alternately as emitters and receivers, or two ultrasonic transducers can be provided at each end of the measuring section, one being an emitter and the other being a receiver.

REFERENCES:
patent: 3237453 (1966-03-01), Yamamoto et al.
patent: 3282101 (1966-11-01), Yamamoto
patent: 3738169 (1973-06-01), Courty

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