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Sensor evaluation using glycerol solutions. Reflectance spectra as a function of incident angle of the sensor device obtained by injecting different weight percentage concentration of glycerol in distilled water: a) at 1250 nm, b) at 850 nm, c) 650 nm, and d) 530 nm. A positive angular shift was observed when the glycerol weight percentage increased. The angular resolution of the instrument was set to 0.1°.
