Fig. 1. Schematic of LIBS experimental device

Fig. 2. Prediction results of Case 1 and Case 2. (a) Case 1；(b) Case 2

Fig. 3. Prediction results of Case 1 and Case 2 after spectral screening. (a) Case 1; (b) Case 2

Fig. 4. GRNN prediction results using selecting 28 special spectral lines

Fig. 5. Prediction results of GRNN after screening abnormal spectra by Mahalanobis distance

Fig. 6. Principal component contribution rate and cumulative contribution rate

Fig. 7. Predicted results of GRNN after PCA

Fig. 8. Average spectra of daily-use ceramic samples from different producing areas. (a)Suzhou；(b)Chaozhou