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3. laser doppler velocimetry is a technique for measuring blood flow...

# Question: laser doppler velocimetry is a technique for measuring blood flow...

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Laser Doppler velocimetry is a technique for measuring blood flow in small blood vessels. Consider the case for a laser at 620 nm and frequency f0. The frequency shifts are very small, but are detectable in practice using interferometric techniques. If a red blood cell in the body “sees” a frequency fb that is shifted in frequency due to the Doppler effect by fb – f0 = 25 kHz Calculate the velocity of the blood cell (speed and direction) with respect to the laser. You can assume that the cell is moving in a direction parallel to the beam. [Hint: Avoid evaluating the frequency fb explicitly unless you are prepared to keep careful track of the correct number of significant figures.]