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What are the differences between UDV and Laser Doppler techniques?

April 26, 2017differences Doppler laser techniques udv

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What are the differences between UDV and Laser Doppler techniques?

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• LDV measures the component which is perpendicular to the axis of the light beam. UDV measures the component which is in the direction of the axis of the ultrasonic beam. • LDV measures the velocity of a single particle. UDV measures velocities of a great number of scatters simultaneously and gives therefore the mean value of all the particles present in the sampling volume. • The maximum velocity is limited in UDV, not in LDV • LDV can not be applied when the liquid contains to many particles, but UDV can. • LDV can not be applied in non transparent liquid, but UDV can. • UDV gives a complete velocity profile, LDV not.