What is the power of laser light used in Laser Doppler Blood flowmeter?(a) 2 mW(b) 3 mW(c) 4 mW(d) 5 mWI have been asked this question at a job interview.The above asked question is from PACS (Picture Archiving and Communication System) in chapter Telemedicine Technology of Biomedical Instrumentation

What is the power of laser light used in Laser Doppler Blood flowmeter

1.	What is the power of laser light used in Laser Doppler Blood flowmeter?(a) 2 mW(b) 3 mW(c) 4 mW(d) 5 mWI have been asked this question at a job interview.The above asked question is from PACS (Picture Archiving and Communication System) in chapter Telemedicine Technology of Biomedical Instrumentation
Answer» Right OPTION is (d) 5 mW Easy explanation: In principle, light from a low POWER (5 mW) He–Ne laser is coupled into a quartz fibre and transmitted to the skin. The light is reflected from both the non-moving tissues (reference BEAM) and moving red BLOOD cells (Doppler-shifted beam). The two beams are received by a plastic fibre and transmitted BACK to a photo-diode where optical heterodyning takes place.

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