Skip to main content
. 2022 Oct 13;22(20):7784. doi: 10.3390/s22207784

Figure 9.

Figure 9

Blood detection: (a) transmissive PPG sensor at the fingertip and provides reliable blood oxygen monitoring. Reprinted with permission from Refs. [99]. Copyright 2022 John Wiley and Sons, (b) reflective PPG sensor at the fingertip and provides reliable blood oxygen monitoring. Reprinted with permission from Refs. [119]. Copyright 2021 American Chemical Society, (c) miniaturized PPG sensor monitoring blood oxygen in the earlobe. Reprinted with permission from Refs. [120]. Copyright 2016 John Wiley and Sons, (d) customized PPG sensors at the toes and provide reliable blood oxygen monitoring while walking. Reprinted with permission from Refs. [121]. Copyright 2020 John Wiley and Sons.