Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

Jiang, Zhenhua; Shao, Junfeng; Wang, Tingfeng

doi:10.1088/2058-6272/aabc5e

Cited by 5 publications

(3 citation statements)

References 52 publications

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“…The leading of nanosecond pulse excites the target to produce plasma. The produced plasma will absorb the trailing energy of the nanosecond pulse in the processes of the plasma expansion, preventing the energy coupling between the nanosecond pulse and the target, leading to the plasma shielding effect [36][37][38][39][40]. Although the increase of the brass temperature was the same and the change of reflectivity was the same in figure 3, due to plasma shielding effect, the energy of nanosecond laser arriving at the brass surface was less than that of femtosecond laser arriving at the brass surface.…”

Section: Resultsmentioning

confidence: 99%

Comparison of sample temperature effect on femtosecond and nanosecond laser-induced breakdown spectroscopy

Liu

Chen

et al. 2021

Plasma Sci. Technol.

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In this paper, we investigated the emission spectra of plasmas produced from femtosecond and nanosecond laser ablations at different target temperatures in air. A brass was selected as ablated target of the experiment. The results indicated that spectral emission intensity and plasma temperature showed similar trend for femtosecond and nanosecond lasers, and the two parameters were improved by increasing the sample temperature in both cases. Moreover, the temperature of nanosecond laser-excited plasma was higher compared with that of femtosecond laser-excited plasma, and the increase of the plasma temperature in the case of nanosecond laser was more evident. In addition, there was a significant difference in electron density between femtosecond and nanosecond laser-induced plasmas. The electron density for femtosecond laser decreased with increasing the target temperature, while for nanosecond laser, the electron density was almost unchanged at different sample temperatures.

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Section: Resultsmentioning

confidence: 99%

Comparison of sample temperature effect on femtosecond and nanosecond laser-induced breakdown spectroscopy

Liu

Chen

et al. 2021

Plasma Sci. Technol.

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“…Changing the parameters of the LIBS instrument was also a way to enhance LIBS signals. The laser energy and the distance between the lens and the sample were critical parameters [ 83 , 84 ]. Chen, et al [ 85 ] used the LIBS technique to generate laser-excited soil samples and studied the effect of the laser energy from 100 to 500 mJ on plasma.…”

Section: Adding Laser Pulses Enhanced Libs For Heavy Metal Detectionmentioning

confidence: 99%

Enhanced Laser-Induced Breakdown Spectroscopy for Heavy Metal Detection in Agriculture: A Review

Yang

Ren

et al. 2022

Sensors

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Heavy metal pollution in agriculture is a significant problem that endangers human health. Laser-induced breakdown spectroscopy (LIBS) is an emerging technique for material and elemental analysis, especially heavy metals, based on atomic emission spectroscopy. The LIBS technique has been widely used for rapid detection of heavy metals with its advantages of convenient operation, simultaneous detection of multi-elements, wide range of elements, and no requirement for the state and quantity of samples. However, the development of LIBS is limited by its detection sensitivity and limit of detection (LOD). Therefore, in order to improve the detection sensitivity and LOD of LIBS, it is necessary to enhance the LIBS signal to achieve the purpose of detecting heavy metal elements in agriculture. This review mainly introduces the basic instruments and principles of LIBS and summarizes the methods of enhanced LIBS signal detection of heavy metal elements in agriculture over the past 10 years. The three main approaches to enhancing LIBS are sample pretreatment, adding laser pulses, and using auxiliary devices. An enhanced LIBS signal may improve the LOD of heavy metal elements in agriculture and the sensitivity and stability of the LIBS technique. The enhanced LIBS technique will have a broader prospect in agricultural heavy metal monitoring and can provide technical support for developing heavy metal detection instruments.

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“…Especially for solids analysis, it is vital to maintain the same focusing distance in the measurements, because a minor bias of focusing position would cause a great change in plasma status. This phenomenon has been well investigated by the studies of LTSD (laser-to-sample distance) [13][14][15][16], and the plasma performance was highly dependent on the selection of focusing positions. But, the LTSD studies were commonly applied to a single sample for mechanism investigation, and little work was devoted to finding a suitable focusing position to realize the quantitative application for multi-sample.…”

Section: Introductionmentioning

confidence: 99%

Spectra-assisted laser focusing in quantitative analysis of laser-induced breakdown spectroscopy for copper alloys

Li¹,

Zheng²,

Deguchi³

et al. 2023

Plasma Sci. Technol.

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Laser-induced breakdown spectroscopy (LIBS) is a capable technique for elementary analysis, while LIBS quantitation is still under development. In quantitation, precise laser focusing plays an important role because it ensures the distance between the laser and samples. In the present work, we employed spectral intensity as a direct way to assist laser focusing in LIBS quantitation for copper alloys. It is found that both the air emission and the copper line could be used to determine the position of the sample surface by referencing the intensity maximum. Nevertheless, the fine quantitation was only realized at the position where the air emission (e.g. O (I) 777.4 nm) reached intensity maximum, and also in this way, a repeatable quantitation was successfully achieved even after 120 days. The results suggested that the LIBS quantitation was highly dependent on the focusing position of the laser, and spectra-assisted focusing could be a simple way to find the identical condition for different samples’ detection. In the future, this method might be applicable in field measurements for LIBS analysis of solids.

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Effect of distances between lens and sample surface on laser-induced breakdown spectroscopy with spatial confinement

Cited by 5 publications

References 52 publications

Comparison of sample temperature effect on femtosecond and nanosecond laser-induced breakdown spectroscopy

Comparison of sample temperature effect on femtosecond and nanosecond laser-induced breakdown spectroscopy

Enhanced Laser-Induced Breakdown Spectroscopy for Heavy Metal Detection in Agriculture: A Review

Spectra-assisted laser focusing in quantitative analysis of laser-induced breakdown spectroscopy for copper alloys

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