What is used to receive beams of light?(a) Plastic fibre(b) Photo diode(c) He-Ne Laser(d) CO2 LaserI got this question during an interview for a job.The question is from PACS (Picture Archiving and Communication System) topic in chapter Telemedicine Technology of Biomedical Instrumentation

What is used to receive beams of light?(a) Plastic fibre(b) Photo diod

1.	What is used to receive beams of light?(a) Plastic fibre(b) Photo diode(c) He-Ne Laser(d) CO2 LaserI got this question during an interview for a job.The question is from PACS (Picture Archiving and Communication System) topic in chapter Telemedicine Technology of Biomedical Instrumentation
Answer» The CORRECT answer is (a) Plastic fibre To explain I would say: 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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What is used to receive beams of light?(a) Plastic fibre(b) Photo diode(c) He-Ne Laser(d) CO2 LaserI got this question during an interview for a job.The question is from PACS (Picture Archiving and Communication System) topic in chapter Telemedicine Technology of Biomedical Instrumentation

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