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. 2023 Sep 23;10(31):2302752. doi: 10.1002/advs.202302752

Figure 2.

Figure 2

a) Molar extinction coefficients of Hb and HbO2. b) Ratio of molar extinction coefficients of Hb and HbO2. Reproduced with permission.[ 94 ] Copyright 2018, National Academy of Sciences. c) Schematic illustrating the light transmission path through the pulsatile and non‐pulsatile arterial blood, venous blood, and tissues and generation of PPG signals consisting of DC and AC components over a few cardiac cycles during systolic and diastolic phases. Reproduced with permission.[ 98 ] Copyright 2014, Springer Nature.