Fig. 1. 3D synchronous fluorescence spectrum of Radix Salviae miltiorrhizae powder solution with mass ratio of 0.4%. (a) 3D plot; (b) contour plot

Fig. 2. 3D synchronous fluorescence spectrum of Radix Salviae miltiorrhizae powder solution with mass ratio of 4%. (a) 3D plot; (b) contour plot

Fig. 3. Sum of squared error curves for different components number

Fig. 4. Excitation loadings curves for different components number. (a) Components number is 4; (b) components number is 5

Fig. 5. Images based on split half method for components number is 4. (a)Split 1--2; (b)split 3--4

Fig. 6. Measured results and experimental results based on parallel factor algorithm when components number is 4. (a) Measured results; (b) experimental results

Fig. 7. Excitation leverage curve based on parallel factor algorithm