LIBS Info: Element Analysis

Title Authors Material Detector Spectrometer Software
Laser-induced breakdown spectroscopy for on-line sulfur analyses of minerals in ambient conditions M. Gaft, L. Nagli, I. Fasaki, M. Kompitsas, G. Wilsch Coal Andor iStar III Oriel InstaSpec V
Laser: Nd:YAG
Gate Delay: Noneus
Gate Width: Noneus
The authors explore a number of different S emission wavelength regions (VUV around 180nm, green (380) and IR (around 920nm) using a range of lasers, single and double pulse LIBS and different detection systems. All face significant challenges, as not only are the emissions fairly weak, but also electronically excited S readily reacts with atmospheric oxygen resulting in a strong diminishing of the line intensity in air. While a range of minerals are studied, the end aim was the online detection of S in coal samples.
Element Detection Limit (ppm) Wavelength (nm) Other Wavelengths (nm) Calibration Method Calibration Range (ppm) Notes
S 100000.0000 (Minimum Concentration Detected) 921.3000 N/A Univariate -10.0000--10.0000 Best results in this region from UV laser (355nm) excitation.
S 50000.0000 (Minimum Concentration Detected) 921.3000 N/A Univariate -10.0000--10.0000 Double Pulse LIBS: First pulse UV (355nm, 10mJ), 2nd pulse IR (1064, 50mJ)
S 1000.0000 (Minimum Concentration Detected) 180.7000 N/A Univariate -10.0000--10.0000 Detection was possible in this region, even with up to 20cm air path between sample and spectrometer (note not optical fibre) but with Nitrogen purged spectrometer

Element RMSE (ppm) Wavelength (nm) Calibration Method Notes