Instantaneous Velocity Profile Measurement by Ultrasonic Doppler Method.

Ultrasonic Doppler Method for velocity profile measurement in Fluid Dynamics and Fluid Engineering

An Ultrasound Doppler Velocity Profile method (UVP method) has been developed for fluid mechanical measurements in physics and engineering. The principle of the method is straightforward; echography and Doppler effect. This method was originally developed in medical engineering to measure blood flow. However, due to various constraints arising from its direct application to the human body, the ...

Ultrasonic distance and velocity measurement by low-calculation-cost Doppler-shift compensation and high-resolution Doppler velocity estimation with wide measurement range

Measurement of fluid-flow-velocity profile in turbid media by the use of optical Doppler tomography.

Optical Doppler tomography is demonstrated to be a simple, accurate, and noncontact method for measuring the fluid velocity of laminar flow in small-diameter (~0.5-mm) ducts. Studies are described that utilize circular (square) plastic (glass) ducts infused with a moving suspension of polymer microspheres in air and buried in an optically turbid medium. The measurement of Doppler-shifted freque...

Studies on arterial flow patients - instantaneous velocity spectrums and their phasic changes - with directional ultrasonic Doppler technique.

Flow velocity spectra of main arteries in 24 healthy adult subjects and 21 healthy aged subjects were transcutaneously studied using the directional ultrasonic Doppler technique. I) The instantaneous flow velocity spectrum is continuous throughout a pulse cycle, and intensified near the instantaneous maximum velocity, especially in the earlypart ofa pulse cycle. 2) No reverse flow phase is obse...

Study of the cardiac arrhythmias by the ultrasonic Doppler method.

The Doppler tracing is a sensitive method for depicting movement of the heart wall, valves, and blood flow. This communication reports the authors' experience with the Doppler method in normal persons and patients with various cardiac arrhythmias. Three main components are recognized in the Doppler tracing: the presystolic component, a; component v, due to systolic movement of the ventricles; a...