Use of ns and fs pulse excitation in laser-induced breakdown spectroscopy to improve its analytical performances: A case study on quaternary bronze alloys
“…Thus, more and more fs LA applications can be expected in the near future. These ablation-related advantages can potentially also be exploited in LIBS, and the community started to investigate these in single and double-pulse analytical applications [13][14][15]. However, at the moment it seems very questionable whether the analytical benefits realized in LIBS by the use of fs laser pulses would justify the need to replace the conventional compact, robust, and economical ns laser sources with the substantially bulkier and costlier fs laser systems other than in some special applications.…”
Laser-induced breakdown spectroscopy (LIBS) has become an established analytical atomic spectrometry technique and is valued for its very compelling set of advantageous analytical and technical characteristics. It is a rapid, versatile, non-contact technique, which is capable of providing qualitative and quantitative analytical information for practically any sample, in a virtually non-destructive way, without any substantial sample preparation. The instrumentation is simple, robust, compact, and even enables remote analysis. This review attempts to give a critical overview of the diverse progress of the field, focusing on the results of the last five years. The advancement of LIBS instrumentation and data evaluation is discussed in detail and selected results of some prominent applications are also described.
“…Thus, more and more fs LA applications can be expected in the near future. These ablation-related advantages can potentially also be exploited in LIBS, and the community started to investigate these in single and double-pulse analytical applications [13][14][15]. However, at the moment it seems very questionable whether the analytical benefits realized in LIBS by the use of fs laser pulses would justify the need to replace the conventional compact, robust, and economical ns laser sources with the substantially bulkier and costlier fs laser systems other than in some special applications.…”
Laser-induced breakdown spectroscopy (LIBS) has become an established analytical atomic spectrometry technique and is valued for its very compelling set of advantageous analytical and technical characteristics. It is a rapid, versatile, non-contact technique, which is capable of providing qualitative and quantitative analytical information for practically any sample, in a virtually non-destructive way, without any substantial sample preparation. The instrumentation is simple, robust, compact, and even enables remote analysis. This review attempts to give a critical overview of the diverse progress of the field, focusing on the results of the last five years. The advancement of LIBS instrumentation and data evaluation is discussed in detail and selected results of some prominent applications are also described.
“…In the case of MP-LIBS, the pulse duration of the main spike in the sequence promotes the heating and melting of the sample, thus facilitating the ablation of the sample surface by the remainder spikes of the pulse train. 15,28 The multi-pulse sequence also helps in exciting the material that has been previously ablated by the first pulse. Figure 4.Crater depth measured in bronze A for both SP-LIBS and MP-LIBS as function of ΔP.…”
Section: Resultsmentioning
confidence: 99%
“…As described, 15 the remote instrument is capable of performing LIBS analysis in both single-pulse (SP) and MP configuration. Accordingly, details for MP-LIBS have been recently reported 28 so only a brief description is given here. In summary, the opening of the Pockels cell at shorter delays from the beginning of the lamp flash produces a train of pulses with variable amplitude and separated in time more or less equidistantly.…”
Section: Methodsmentioning
confidence: 99%
“…In fact, a variety of DP-LIBS configurations (collinear, orthogonal, and cross-beam) with sequential laser wavelengths (1064, 532, 355, and 266 nm) and pulse widths (ns-and fs-) has been explored so far for quantitative analysis of submersed materials. [25][26][27] In this report, the use of a multi-pulse excitation (MP-LIBS) has been evaluated as an effective solution to mitigate the fractionation effects observed in LIBS analysis of copper-based alloys. The use of copper as internal standard minimizes matrix effects and discrepancies due to variation in ablated mass.…”
In this work, the use of multi-pulse excitation has been evaluated as an effective solution to mitigate the preferential ablation of the most volatile elements, namely Sn, Pb, and Zn, observed during laser-induced breakdown spectroscopy (LIBS) analysis of copper-based alloys. The novel remote LIBS prototype used in this experiments featured both single-pulse (SP-LIBS) and multi-pulse excitation (MP-LIBS). The remote instrument is capable of performing chemical analysis of submersed materials up to a depth of 50 m. Laser-induced breakdown spectroscopy analysis was performed at air pressure settings simulating the conditions during a real subsea analysis. A set of five certified bronze standards with variable concentration of Cu, As, Sn, Pb, and Zn were used. In SP-LIBS, signal emission is strongly sensitive to ambient pressure. In this case, fractionation effect was observed. Multi-pulse excitation circumvents the effect of pressure over the quantitative analysis, thus avoiding the fractionation phenomena observed in single pulse LIBS. The use of copper as internal standard minimizes matrix effects and discrepancies due to variation in ablated mass.
“…strongly inuence the plasma properties, and its emissivity denes LIBS analytical capabilities. 1,3,[9][10][11] Different types of laser sources have been utilized, depending on the LIBS analysis goals (major components vs. additives analysis) and specic environment conditions (high ambient temperature, dusty or radioactive environment, etc.). The pulsed solid state Nd:YAG laser is a "workhorse" for most industrial LIBS applications due to its reliability, compactness, low price and robustness.…”
A low weight diode-pumped Nd:YAG laser (400 g, 1064 nm, 5 ns, 130 mJ per pulse) was developed for a compact laser-induced breakdown spectroscopy (LIBS) system to be installed on a robotized arm.
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