A Doppler flow meter uses ultrasound waves to measure blood-flow speeds. Suppose the device emits sound...
A Doppler flow meter uses ultrasound waves to measure blood-flow speeds. Suppose the device emits sound at 3.9MHz , and the speed of sound in human tissue is about 1540 m/s. What is the expected beat frequency if blood is flowing in large leg arteries at 3.0
cm/s directly away from the sound source?Homework Answers
f = f0*(c-vr)/(c+vr) =
3900*(300000000-1540*0.03)/(300000000+1540*03) =3899.998
Hz
Beat frequency df = f0-f =
3900Hz-3899.998Hz=0.040039 Hz
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