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Transactions of the Institute of Measurement and Control
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Photoplethysmography- fundamental aspects of the optical properties of blood in motion

V.C. Roberts, PhD, CEng, MBES, FIEE

Biomedical Engineering Department, King's College Hospital Medical School, Denmark Hill, London SE5

This paper outlines a simplified theory to explain the behaviour of photoelectric plethysmographs used for the measurement of blood flow in the skin. The paper reports the finding that light diffusing through blood, from a source outside a blood vessel, can diffuse preferentially in the direction of motion of the blood, and that this preferential diffusion is likely to arise from a combination of the plasma skimming which occurs at the vessel wall and from the orientation effects of the erythrocytes in motion.

Transactions of the Institute of Measurement and Control, Vol. 4, No. 2, 101-106 (1982)
DOI: 10.1177/014233128200400205
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?