This paper presents a velocity profile measurement technique using a ultrasound time-domain correlation method (UTDC). The system is based on the cross correlation between two consecutive echoes of ultrasonic pulses to detect the velocity. The UTDC has two advantages over a conventional ultrasound pulse Doppler method. First the system has a higher time resolution than the pulse Doppler method. Second, the system does not have a limitation in maximum measurable velocity, which is limited by Nyquist’s sampling theorem.

In this paper, the velocity profile measurement using the UTDC is performed, and the velocity profiles measured by the UTDC is compared with the one obtained using the pulse Doppler method.

The result showed that aliasing effect occured by the measurement of the pulse Doppler method but does not occured by that of the UTDC at the same pulse repetation frequency.

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