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. 2021 Sep 10;21(18):6072. doi: 10.3390/s21186072

Figure 5.

Figure 5

Schematic (a) and photograph (b) of the experimental setup of the CRT and contact pressure measurements; light source (LED, λ = 530 nm), photodetector (PD + TIA) PDA36A, interrogator (SmartScope), DAQ–data acquisition card. The sensor sits under the foot of the volunteer.