Device to detect the speed profile of concrete flowing into...

G - Physics – 01 – S

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Details

G01S 15/50 (2006.01) G01N 29/024 (2006.01) G01N 29/22 (2006.01) G01N 29/34 (2006.01) G01P 5/00 (2006.01)

Patent

CA 2252724

A device to detect the speed profile of concrete flowing through a pipeline with radial symmetry comprises acoustical probe means, apt to send through said pipeline and the concrete a supersonic ray inclined in respect of the pipeline axis and to receive a disturbed supersonic ray in response, as well as an electronic circuit apt to analyse the signals sent by said probe means and obtain therefrom a diagram showing the speed profile of the concrete. According to the invention, said probe means make use of a supersonic ray of frequency between 20 and 500 KHz, and said electronic circuit processes the signals sent by the probe means, indicating the speed, with an updating frequency from 10 to 70 times per second and deprives said signals from their components derived from the propagation rate in the concrete, to obtain a measurement of the speed along the acoustical axis, which is not relative and has its own sign.

L'invention concerne un dispositif de détection du profil de vitesses du béton s'écoulant dans une conduite de symétrie radiale. Ce dispositif comprend d'une part une sonde acoustique, apte à envoyer dans la conduite et le béton, une émission supersonique inclinée par rapport à l'axe principal, et à recevoir en réponse l'émission supersonique perturbée; d'autre part une logique électronique apte à analyser les signaux envoyés par la sonde et à obtenir un diagramme indiquant le profil de vitesses du béton. Selon cette invention, la sonde peut mettre en oeuvre une émission supersonique d'une fréquence comprise entre 20 et 500 KHz. Cette logique électronique traite également les signaux envoyés par la sonde, pour donner une indication de la vitesse, à une fréquence de rafraîchissement allant de 10 à 70 fois par seconde, et prive les signaux de leurs composantes dérivées de la vitesse de propagation afin d'obtenir une mesure de la vitesse selon l'axe acoustique, laquelle mesure n'est pas relative et possède son propre signe.

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