Apparatus and method using an array of ultrasonic sensors...

G - Physics – 01 – F

Patent

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G01F 1/66 (2006.01) G01F 1/704 (2006.01) G01F 1/708 (2006.01) G01F 1/712 (2006.01) G01F 1/74 (2006.01) G01N 29/34 (2006.01)

Patent

CA 2513248

An apparatus and method for measuring the flow velocity of a fluid flowing through a pipe that includes an array of at least two ultrasonic sensor units (with as many as 16 sensor units) disposed at predetermined locations along the pipe. Each sensor unit includes an ultrasonic transmitter and an ultrasonic receiver. Each sensor unit provides a respective signal indicative of a parameter of the transit time or amplitude of the ultrasonic signal propagating between each respective ultrasonic transmitter and ultrasonic receiver. A signal processor defines a convective ridge in the k-.omega. plane in response to the ultrasonic signals using an adaptive beamforming algorithm, such as Capon and Music. The signal processor further determines the slope of at least a portion of the convective ridge to determine the flow velocity of the fluid.

Cette invention concerne un appareil et un procédé servant à mesurer la vitesse d'écoulement d'un fluide s'écoulant dans un tuyau, lequel appareil comprend un réseau composé d'au moins deux capteurs ultrasoniques (et pouvant comprendre jusqu'à 16 capteurs) placés à des endroits prédéterminés le long du tuyau. Chacun des capteurs comprend un émetteur ultrasonore et un récepteur ultrasonore. Chacun des capteurs émet un signal respectif indiquant un paramètre du temps de parcours ou de l'amplitude du signal ultrasonore se propageant entre chacun des émetteurs ultrasonores et des récepteurs ultrasonores correspondants. Un processeur de signaux définit une crête de convection dans le plan k-.omega. en réponse aux signaux ultrasonores à l'aide d'un algorithme de mise en forme de faisceaux adaptatif, tel que Capon et Music. Le processeur de signaux détermine également la pente d'au moins une partie de la crête de convection afin de déterminer la vitesse d'écoulement du fluide.

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