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. 2015 Dec 4;10(12):e0143506. doi: 10.1371/journal.pone.0143506

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© 2015 Yamakoshi et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 1 — Experimental setup for the measurement of finger-photoplethysmograms using a conventional transmition-type configuration and an integrating sphere-type with NIR laser light at two wavelengths. (See text for more detailed explanation.) AC = alternating-current component, DC = direct-current component, ECG = electrocardiogram, FPPG = finger-photoplethysmogram, HPF = high pass filter, LD = laser diode, LPF = low pass filter, PD = photo diode, S/H = sample and hold.