Effects of the combination of sample temperature and spatial confinement on laser-induced breakdown spectroscopy

Yu, Dakuan; Sun, Yan; Feng, Zhishu; Dai, Yuyin; Chen, Anmin; Jin, Mingxing

doi:10.37188/co.2020-0118

Cited by 7 publications

(2 citation statements)

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“…The spatial constraint was a widespread common method for the physical enhancement of LIBS signals. It only required the addition of structures, such as constrained cavities or parallel plates around the sample, which had the advantage of simplicity and low cost [ 89 ]. The main principle of the spatial constraint was that the plasma produced by spatial constraint greatly increased the collision probability of the plasma, improved the space-time stability of the plasma, and reduced the scattering of the plasma, thus enhancing the LIBS signal [ 90 ].…”

Section: Adding Auxiliary Devices Enhanced Libs For Heavy Metal Detec...mentioning

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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Section: Adding Auxiliary Devices Enhanced Libs For Heavy Metal Detec...mentioning

confidence: 99%

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

Yang

Ren

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…However, there are some key issues remaining unsolved, such as low detection sensitivity and low limit of detection. In order to tackle these problems, many methods have been proposed, including magnetic confinement [6,7], spatial confinement [8,9], spark discharge [10][11][12], double-pulse LIBS [13,14] and fs-LIBS [15]. Among these methods, the spatial limitation stands out by its own advantages, since it does not need any sophisticated equipment and also may be reproducible and repetitive.…”

Section: Introductionmentioning

confidence: 99%

The effects of cavity diameter and material type of spatial confinement on intensity of laser-induced breakdown spectroscopy

Wang¹,

Jia²,

Gao³

et al. 2022

Phys. Scr.

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In this paper, we have investigated the spatial confinement effects on the spectrum intensity of tungsten plasma generated by laser-induced breakdown spectroscopy in the near-vacuum environment. The enhancement effects that vary with the diameters of the spatial confinement cylinders and with the material type are analyzed. We find that for an Al cylinder, the enhancement factor o reaches its highest value at diameter 4mm. The primary causes behind this finding are attributed to the influences of diameter on the bounce time of shock wave propagating in the plasma as well as on the available range of spectrum collection. Moreover, the enhancement effect of Al cylinder is better than the other four types of materials: ZrO2, Al2O3, Fe and Cu. For each of the latter four types of materials, the thermal conductivity plays a major role on the enhancement effect, whereas for Al the enhancement effect is mainly due to its extremely large reflectivity. Particularly, for cavity with a diameter of 4 mm made of Aluminum, the maximum of the enhancement factor can approximately reach as high as 15. These experimental results indicate that the signal intensity of laser-induced breakdown spectroscopy can be dramatically improved by appropriately selecting diameter and material type of the cylindrical cavity.

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Effect of cavity-confinement and microwave-assistance on laser-induced Cu plasma in pig feed

Xue

Yao

et al. 2022

Optik

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Effects of the combination of sample temperature and spatial confinement on laser-induced breakdown spectroscopy

Cited by 7 publications

References 0 publications

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

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

The effects of cavity diameter and material type of spatial confinement on intensity of laser-induced breakdown spectroscopy

Effect of cavity-confinement and microwave-assistance on laser-induced Cu plasma in pig feed

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