Where optical heterodyning takes place in Laser Doppler Blood Flowmeter?(a) Plastic fibre(b) Photo diode(c) He-Ne Laser(d) CO2 LaserI got this question in an interview.My doubt stems from PACS (Picture Archiving and Communication System) in portion Telemedicine Technology of Biomedical Instrumentation

Where optical heterodyning takes place in Laser Doppler Blood Flowmete

1.	Where optical heterodyning takes place in Laser Doppler Blood Flowmeter?(a) Plastic fibre(b) Photo diode(c) He-Ne Laser(d) CO2 LaserI got this question in an interview.My doubt stems from PACS (Picture Archiving and Communication System) in portion Telemedicine Technology of Biomedical Instrumentation
Answer» Right option is (b) Photo diode 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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