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. 2021 Oct 14;21(20):6820. doi: 10.3390/s21206820

Figure 2.

Figure 2

Schematic representation of (a) transmission and (b) reflection configurations of NIR spectroscopy. In the transmission configuration, the detector is located on the other side of the sample and only the transmitted photons are measured. In the reflection configuration, the detector is located on the same side of the sample and only the scattered photons are measured.