Doppler flow measurement apparatus

A - Human Necessities – 61 – B

Patent

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A61B 8/06 (2006.01)

Patent

CA 2577422

The present invention relates to a measurement of a flow by the use of Doppler ultrasound, and in particular, by analyzing the spectrum of the reflected ultrasonic signal. The reflected signal is mixed electronically with the transmitted signal in a product detector, demodulator or similar component (250) to produce a signal that is shifted in frequency. In another embodiment, the method includes analyzing the spectrum (280, 300) of the reflected ultrasonic beams by performing the step of: (a) determining a maximum frequency of the detector output signal which is representative of a maximum particle velocity; and (b) calculating a total flow of the particles based on the maximum particle velocity.

La présente invention permet de mesurer un écoulement par ultrasons Doppler et, en particulier, par l'analyse du spectre du signal ultrasonore réfléchi. On mélange électroniquement le signal réfléchi au signal transmis dans un détecteur de produit, un démodulateur ou un composant similaire afin d'obtenir un signal décalé en fréquence. Dans un autre mode de réalisation, le procédé consiste à analyser le spectre des rayons ultrasonores réfléchis en procédant aux étapes suivantes: (a) on détermine une fréquence maximale du signal de sortie du détecteur qui est représentative d'une vitesse de particule maximale; et (b) on calcule un écoulement total de particules sur la base de la fréquence de particule maximale.

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