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. 2012 Jan 16;12(1):895–904. doi: 10.3390/s120100895

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© 2012 by the authors; licensee MDPI, Basel, Switzerland

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 3. — Photodiode signal sensing in an oscillating (i.e., dilating and contracting) artery. An artery in the phantom is dilating and contracting due to the pulse waves generated by the pump. The volume change in the artery causes intensity change in the light passing through. This slight oscillation can be observed in the measured photodiode current (right side of the figure). Pulsation intensity refers to the strength of the oscillation.