Ultrasonic doppler effect speed measurement

G - Physics – 01 – S

Patent

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Details

G01S 15/50 (2006.01) G01S 15/58 (2006.01) G01S 7/536 (2006.01)

Patent

CA 2454612

An ultrasound transducer (12) is coupled to a transmitter (11) having a source of ultrasound signal. A receiving ultrasound transducer (13) is coupled to a preamplifier (14) and mixer (15). The mixer (15) is further coupled to a demodulator (16) and filter (17) which in turn is coupled to an amplifier (18) and a comparator (19). The comparator (19) output is coupled to a controller (20) which performs edge detection of the comparator output signal. The transmitter (11) produces ultrasound energy which is reflected from an object (31) to the receiving transducer (13). The shift in frequency between the transmitted ultrasound energy (30) and the reflected ultrasound energy (32) is used to determine the speed of the object (31) by employing Doppler effect. Frequency detection is enhanced by mixing the transmitted and reflected ultrasound signals to provide a beat frequency signal.

L'invention concerne un transducteur ultrasonore couplé à un émetteur ayant une source de signal ultrasonore. Un transducteur ultrasonore de réception est couplé à un préamplificateur et à un mélangeur couplé, à son tour, à un démodulateur et à un filtre qui est couplé à un amplificateur et à un comparateur. La sortie du comparateur est couplée à un contrôleur qui effectue la détection des contours du signal de sortie du comparateur. L'émetteur produit une énergie ultrasonore réfléchie depuis un objet vers le transducteur de réception. Le déplacement de fréquence apparaissant entre l'énergie ultrasonore émise et l'énergie ultrasonore réfléchie sert à déterminer la vitesse de l'objet grâce à l'effet Doppler. La détection de fréquence est améliorée par le mélange de signaux ultrasonores émis et réfléchis de manière à obtenir un signal de fréquence de battement.

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