High-precision measuring method and apparatus

G - Physics – 01 – D

Patent

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G01D 5/48 (2006.01) A61B 5/11 (2006.01) G01F 1/66 (2006.01) G01K 11/24 (2006.01) G01L 11/04 (2006.01) G01N 29/024 (2006.01) G01N 29/07 (2006.01) G01S 11/12 (2006.01) G01S 11/14 (2006.01) G01S 13/02 (2006.01) G01S 11/02 (2006.01)

Patent

CA 2370164

A method and apparatus for measuring a predetermined parameter having a known relation to the transit time of movement of an energy wave through a medium by: transmitting from a first location (A) in the medium a cyclically-repeating energy wave (e.g., an acoustical wave, or electromagnetic wave); receiving the wave at a second location (B) in the medium; detecting a predetermined fiducial point in the wave received at the second location (B) continuously changing the frequency of transmission of the wave from the first location (A) to the second location (B) in accordance with the detected fiducial point of each wave received at the second location (B) such that the number of waves received at the second location (B) from the first location (A) is a whole integer, and utilizing the change in frequency to produce a measurement of the predetermined parameter.

L'invention concerne un procédé et un dispositif servant à mesurer un paramètre prédéterminé ayant une relation connue avec le temps de parcours du mouvement d'une onde d'énergie à travers un support. Le procédé consiste à émettre une onde d'énergie à répétition cyclique (telle qu'une onde acoustique ou électromagnétique) depuis un premier emplacement (A) dans le support, à recevoir l'onde à un second emplacement (B) dans le support, à détecter un point de référence prédéterminé dans l'onde reçue au second emplacement (B), à changer continuellement la fréquence d'émission de l'onde depuis le premier emplacement (A) jusqu'au second emplacement (B) en fonction du point de référence détecté de chaque onde reçue au second emplacement (B), de manière que le nombre d'ondes reçues au second emplacement (B) depuis le premier emplacement (A) soit un nombre entier, et à utiliser le changement de fréquence pour effectuer une mesure dudit paramètre prédéterminé.

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