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29 May 2013 Development of a Raman chemical image detection algorithm for authenticating dry milk
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This research developed a Raman chemical imaging method for detecting multiple adulterants in skim milk powder. Ammonium sulfate, dicyandiamide, melamine, and urea were mixed into the milk powder as chemical adulterants in the concentration range of 0.1–5.0%. A Raman imaging system using a 785-nm laser acquired hyperspectral images in the wavenumber range of 102–2538 cm–1 for a 25×25 mm2 area of each mixture. A polynomial curve-fitting method was used to correct fluorescence background in the Raman images. An image classification method was developed based on single-band fluorescence-free images at unique Raman peaks of the adulterants. Raman chemical images were created to visualize identification and distribution of the multiple adulterant particles in the milk powder. Linear relationship was found between adulterant pixel number and adulterant concentration, demonstrating the potential of the Raman chemical imaging for quantitative analysis of the adulterants in the milk powder.
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Jianwei Qin, Kuanglin Chao, and Moon S. Kim "Development of a Raman chemical image detection algorithm for authenticating dry milk", Proc. SPIE 8721, Sensing for Agriculture and Food Quality and Safety V, 872102 (29 May 2013);

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