IR Plethysmograph

Plethysmograph is an infrared photoelectric sensor used to record changes in pulsatile blood flow from the finger. The Plethysmograph operates by recording changes in blood volume as the arterial pulse expands and contracts the microvasculature.
This circuit will provide an alternative method to visualize pulse rate for the children and remove the complications of electrode application. An enclosure will be made to help deliver a consistent view of the pulse rate and remove any motion artifacts that might be visible. The ideal enclosure could be as simple as a clothes pin. The following video also demonstrates our latest working beat detection method displaying the heart rate.

Video Demo: