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. 2018 Mar 18;18(3):900. doi: 10.3390/s18030900

Figure 1.

Figure 1

The 12-mm sensors tested in this investigation. (a) The EXcell 230 NIR turbidity sensor and the corresponding measurement principle of light scattering. (b) The Incyte dielectric spectroscopy probe with corresponding measurement principle of bio-impedance (measurement principles adapted from [29]).