STUDY ON THE DEVELOPMENT OF NOVEL VELOCITY PROFILE MEASURING METHOD USING ULTRASOUND TIME- DOMAIN CROSS-CORRELATION

This paper presents a velocity profile measurement by a novel method using pulsed ultrasound. The method is called ultrasound time-domain correlation method (UTDC) and 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 pulsed Doppler method. First, the method has higher time and spatial resolutions than the pulse Doppler method. Second, the system does not have a limitation in maximum measurable velocity and range, which are limited by Nyquist's sampling theorem. In the paper, the velocity profile measurement in turbulent pipe flow using the UTDC is performed. 1