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. 2009 Nov;13(6):1085-8.
doi: 10.1109/TITB.2009.2031108. Epub 2009 Sep 22.

Photoplethysmogram measurement without direct skin-to-sensor contact using an adaptive light source intensity control

Hyun Jae Baek  1 , Gih Sung Chung, Ko Keun Kim, Jung Soo Kim, Kwang Suk Park
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Photoplethysmogram measurement without direct skin-to-sensor contact using an adaptive light source intensity control

Hyun Jae Baek et al. IEEE Trans Inf Technol Biomed. 2009 Nov.

Abstract

We developed a chair-attached, nonintrusive photoplethysmogram (PPG) measuring system for everyday life, unconstrained monitoring using nonskin-contacting sensor-amplifier circuits capable of emitting suitable light intensity adaptable to clothing characteristics. Comparison between proposed and conventional systems showed reasonable correlation and root-mean-squared error levels, indicating its feasibility for unconstrained PPG monitoring.

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