PROGRESS 3: INTRODUCTION
Before I get started with this project, I had
done some researches about the Photoplethsmography sensor to get overview for
more understanding.
What is Photoplethsmography sensor?
Photoplethysmography (PPG) is a
simple and low-cost optical technique that can be used to detect blood volume
changes in the microvascular bed of tissue. It is often used non-invasively to
make measurements at the skin surface. The PPG waveform comprises a pulsatile
('AC') physiological waveform attributed to cardiac synchronous changes in the
blood volume with each heart beat, and is superimposed on a slowly varying
('DC') baseline with various lower frequency components attributed to
respiration, sympathetic nervous system activity and thermoregulation.
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