LIBS Info: Element Analysis

Title Authors Material Detector Spectrometer Software
A partial least squares and wavelet-transform hybrid model to analyze carbon content in coal using laser-induced breakdown spectroscopy Jianmin Liu, Weidou Ni, Zheng Li, Zhe Wang, Tingbi Yuan Coal Spectrolaser 4000 Spectrolaser 4000 Spectrolaser
Laser: Nd:YAG
Gate Delay: 2.000us
Gate Width: 1000.000us
The authors use wavelet denoising, then PLS (on the wavelet coefficients rather than the reconstructed spectra) to study Carbon content of coal samples. Samples were presented as pressed powder pellets. To find the best analysis conditions, analysis atmospheres containing air, argon and helium were tested. For example, the SNR from wavelet denoising doubled under Air and Ar, but tripled under He. Overall, Helium provided the best results.
Element Detection Limit (ppm) Wavelength (nm) Other Wavelengths (nm) Calibration Method Calibration Range (ppm) Notes

Element RMSE (ppm) Wavelength (nm) Calibration Method Notes
C 1.9400 % -10.0000 PLS Wavelet denoising, then PLS in a He atmosphere