a) Derive an equation, from first principles, that relates the Doppler
shift to the blood flow velocity in laser Doppler flowmetry.
A laser Doppler flowmeter is being used to measure the velocity
of blood flow in one specific vein near the surface of the arm.
The laser source (wavelength, 1 = 800 nm) and the detector of
the laser Doppler flowmeter instrument are adjacent to each
other, and the beam is aimed at the vein with an angle of 45° to
the flow direction. The beat frequency (between the
backscattered light and the original laser light) measured by the
instrument is 500 kHz. What is the speed of the blood flowing in
Describe the factors that place practical limitations on the laser
Doppler flowmetry technique.
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