Flow Meter 2
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What is beat frequency if blood is flowing in leg arteries at 2.0 cm/s away from sound source?
A Doppler flow meter uses ultrasound waves to measure blood-flow speeds. Suppose the device emits sound at 3.5 MHz, and the speed of sound in human tissue is taken to be 1540 m/s. What is the expected beat frequency if blood is flowing in large leg arteries at 2.0 cm/s directly away from the sound source?
90.91 Hz.
f = f0*(c-vr)/(c+vr) = 3499909.09208971 Hz
Beat frequency df = f0-f = 90.9079102869146 Hz
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