G - Physics – 01 – F
Patent
G - Physics
01
F
349/39
G01F 1/66 (2006.01) G01P 5/24 (2006.01)
Patent
CA 1151284
ABSTRACT OF THE DISCLOSURE: A device for measuring the speed of a fluid in a tube. This measuring device comprises two ultrasonic electro-acoustic transducers set out in the tube, a trans- mitter circuit for energizing these transducers by first and second transmit pulse groups, and an electronic circuit for receiving first and second receive pulse groups at the transducer output, for measuring a first delay between the start of the first transmit pulse group and the start of the first receive pulse group and a second delay between the start of the second transmit pulse group and the start of the second receive pulse group, and for measuring a third delay between the starts of the first and second receive pulse groups. The speed of the fluid in the tube is proportional to the quotient of the third delay by the product of the first and second delays. The delays compri- se an integer delay part which is measured by clock pulses counting and fractional delay parts which are measured by constant current integrators.
349595
Appel Jean G.
Dunand Francois M.
Office National D'etudes Et de Recherches Aerospatiales (o.n.e.r
Robic Robic & Associes/associates
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