Fig. 1. Schematic of Raman spectrometer structure

Fig. 2. Detection spectra of naphthalene for each product

Fig. 3. FWHM of Raman peaks near 389, 1020, and 1576 cm^-1 for each product

Fig. 4. Displacement accuracy statistics

Fig. 5. Repeatability experiment of naphthalene (taking product B as an example)

Fig. 6. Detection result. (a) Maximum displacement difference statistics; (b) δC⋅V statistics

Fig. 7. Intensity repeatability statistics

Fig. 8. R_SN statistics

Fig. 9. Database capacity and ratio of sample size to time

Fig. 10. Capacity statistics of different instruments under various parameters