Observations on the photoplethysmograph pulse derived from a laser Doppler flowmeter.

@article{Almond1989ObservationsOT,
  title={Observations on the photoplethysmograph pulse derived from a laser Doppler flowmeter.},
  author={Nigel Almond and Edward D. Cooke},
  journal={Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics},
  year={1989},
  volume={10 2},
  pages={137-45}
}
A photoplethysmograph signal has been derived from a laser Doppler flowmeter which uses optical fibres separated by 1 mm. When compared with a conventional photoplethysmograph, the trace contains a higher proportion of random signal superimposed on the pulse. The bandlimited laser photoplethysmograph (0.5-16 Hz) was recorded from the finger in six subjects. At low blood flows or during arterial occlusion the random component was more evident, producing a significant signal power increase in the… CONTINUE READING