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. 2014 Nov 20;14(11):21968–21980. doi: 10.3390/s141121968

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 11. — Sample (III): pain reliever tablet with caffeine, aspirin, and paracetamol. (Upper left) camera image taken with a 20× objective; (Upper right) Overlay of the detected locations of caffeine (yellow), aspirin (green), and paracetamol (red) as contour color illustration. The brown diamond indicates the position of a defective fiber within the probe head. (Lower left) Raman image of caffeine (1703 cm⁻¹); (Lower middle) Raman image of aspirin (1047 cm⁻¹); (Lower right) Raman image of paracetamol (860 cm⁻¹).