Research Article
A Photoplethysmography Melanin Evaluation System by Modified Boltzmann Transport Equation (BTE)
Table 1
Comparison between conventional devices and device in this study.
| | Skintel melanin reader | MU99 | Soft plus | Physiskin (this study) |
| Wavelength (nm) | 640 700 910 | 568 660 870 | 660 875 | 640 700 940 |
| Power consumption | — | 3.6 W | 60 W | 0.2 W |
| Index range | 0–99 | 0–999 | 0–100 | 0–999 |
| Measurement time | 1 sec | 1 sec | — | 1 sec |
| Measure hemoglobin | ✗ | ✓ | ✗ | ✓ |
| Measure melanin | ✓ | ✓ | ✓ | ✓ |
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