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Abstract:
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Photoplethysmography (PPG) is a simple and inexpensive optical
technique that can be used to detect blood volume changes in the
microvascular bed of tissues. There has been a resurgence of
interest in the technique in recent years, driven by the demand for low
cost, simple and portable technology for the primary care and
community based clinical settings and the wide availability of low cost
and small semiconductor components, and the advancement of
computer-based pulse wave analysis techniques. The present research work deals with the design of a PPG sensor for recording the
blood volume pulse signals and carry out selected cardiovascular studies based
on these signals. The interaction of light with tissue, early and recent history of PPG,
instrumentation, measurement protocol and pulse wave analysis are also discussed in this study. The effect of aging, mild cold exposure, and variation in the body posture on the PPG
signal have been experimentally studied. |