Fig. 1. Flow chart of oil species detection in mixed oil

Fig. 2. Trilinear decomposition model

Fig. 3. Three-dimensional fluorescence spectra and contour maps of jet fuel before and after calibration. (a) Three-dimensional fluorescence spectrum before calibration; (b) contour map before calibration; (c) three-dimensional fluorescence spectrum after calibration; (d) contour map after calibration

Fig. 4. Three-dimensional fluorescence spectra and contour maps of lube before and after calibration. (a) Three-dimensional fluorescence spectrum before calibration; (b) contour map before calibration; (c) three-dimensional fluorescence spectrum after calibration; (d) contour map after calibration

Fig. 5. Three-dimensional response matrix X. (a) Core consistency value; (b) residual sum of squares

Fig. 6. Result for the 16th sample. (a) Three-dimensional fluorescence spectrum; (b) contour map

Fig. 7. Results for jet fuel and lube obtained by APTLD algorithm. (a) Excitation spectra; (b) emission spectra

Fig. 8. Results for jet fuel and lube obtained by parallel factor algorithm. (a) Excitation spectra; (b) emission spectra

Table 1. Ratio of jet fuel to lube in mixed oil

Table 2. RMSE and correlation coefficient matrix between spectral curves of pure and mixed oil