| BLL | Beer Lambert Law |
| CMOS | Complementary Metal-Oxide Semiconductor |
| DUT | Device Under Test |
| FWHM | Full Width at Half Maximum |
| LED | Light-Emitting Diode |
| NIR | Near Infra-Red |
| PI | Perfusion Index |
| PPG | PhotoPlethysmoGram |
| SMD | Surface Mount Device |
| VCSEL | Vertical-Cavity Surface-Emitting Laser |
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