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Doppler velocimetry works on the principle of __________

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Doppler velocimetry works on the principle of __________

(a) frequency measurement of fiber optic sensor

(b) amplitude measurement of fiber optic sensor

(c) phase measurement of fiber optic sensor

(d) time shift measurement of fiber optic sensor

I got this question during an online exam.

Origin of the question is Biosensors topic in portion Physiological Transducers of Biomedical Instrumentation

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Correct choice is (a) frequency measurement of fiber optic sensor

The explanation: Doppler velocimetry works on the principle of frequency measurement of fiber optic sensor. In this method, light from a laser, normally helium/neon, is sent via a fibre onto the skin surface. The moving red blood cells scatter the light and produce a Doppler frequency shift because of their movement.

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