Qiao-ling YANG, Qin CHEN, Bing NIU, Xiao-jun DENG, Jin-ge MA, Shu-qing GU, Yong-ai YU, De-hua GUO, Feng ZHANG. Visualization of Thiourea in Bulk Milk Powder Based on Portable Raman Hyperspectral Imaging Technology On-Site Rapid Detection Method Research[J]. Spectroscopy and Spectral Analysis, 2022, 42(7): 2156
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 7, 2156 (2022)
Fig. 1. Schematic diagram of point scanning two-dimensional Raman spectroscopy imaging system
Fig. 2. Schematic diagram of sample preparation
(a): Mold drawing required for double-layer sample;(b1): Double-layer sample drawing; (b2): Mixed sample drawing
(a): Mold drawing required for double-layer sample;(b1): Double-layer sample drawing; (b2): Mixed sample drawing
Fig. 3. Raman spectra of thiourea and milk powder under different integration time and laser power
Fig. 4. Raman spectra of double-layer samples with different milk powder thickness (n =3)
Fig. 5. Binary images of double-layer samples with different milk powder thickness (n =3)
Fig. 6. Binary heat map of mixed sample of thiourea milk powder (n =6)
Fig. 7. Linear fitting graph of thiourea concentration and the number of pixels
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