Raw signal improvement using beam shaping plasma modulation for uranium detection in ore using laser-induced breakdown spectroscopy

Quantitative performance improvement using beam shaping plasma modulation for uranium detection in di-uranate using laser-induced breakdown spectroscopy

“…This observation is consistent with the ndings reported in ref. 22. Table 2 The results of identifying specific spectral lines from Fig.…”

“…As for the main reason why at top beams can reduce substrate effects, it may be due to the fact that, when the Gaussian beam is transformed into a at top beam, more laser energy is used to ablate the sample and heat the plasma. 22,30 The increased amount of ablation reduces the sensitivity of the sample characteristics, leading to a decrease in the matrix effect. In addition, the generated plasma is larger and more stable, which may make it easier to collect the core plasma and reduce the difference in plasma parameters between samples, thereby reducing the matrix effect.…”

“…The laser energy used in this experiment was 100 mJ and the acquisition delay was 1 ms. To compare the effect of the at top beam, a beam shaper was placed in front of the focus lens to convert the Gaussian beam into a at top beam with uniform energy distribution. The specic description of this device has been mentioned in other studies of our group, 17,18 and will not be repeated here.…”

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

“…Ji et al 116 found that shaping the laser beam prole from Gaussian distribution to at-top resulted in a higher plasma temperature and similar n e . This resulted in an improvement in the method to determine U in ores, due to less line broadening and less line overlap or interferences.…”

Fast fingerprint scanning and chemical composition identification of a large-scale material surface by a combined HSI-LIBS operation

“…The HSI-LIBS test has three outstanding advantages compared with the point-to-point mapping method: (1) it has no limit on the sample surface area size and has high spatial resolution; in comparison, the point-to-point mapping method has strict requirements on sample size and lower spatial resolution; 12 (2) its scanning speed is fast (tens of seconds), while the point-to-point mapping method usually requires time ranging from a few minutes to several hours; 10,13,14 (3) it provides mass information, including test size, orientation and location, optical reflection spectra and intensity, chemical composition and content. 9 15,16 Hence, the combined HSI-LIBS method overcomes the limitations of single spectroscopic technology and provides a new idea and means of material surface visualization analysis.…”