EXPRESS: Effects of Ambient Temperature on Laser-Induced Plasma in Bulk Water

Li, Nan; Guo, Jinjia; Zhu, Lin; Lu, Yuan; Tian, Ye; Zheng, Ronger

doi:10.1177/0003702819856353

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…Multiple plasma formations triggered by impurities such as suspended particles or microbubbles may occur in water that could cause strong pulse-to-pulse fluctuations. , Up to now, many efforts have been made to improve the quality of underwater LIBS signals by using the double-pulse − or long-pulse − techniques. Other studies investigated the impacts of oceanic parameters such as pressure, − temperature, and salinity on LIBS signals, as well as the data processing methods , to improve the analytical performance. In our previous work, we also demonstrated the critical role of laser focusing geometry in producing the ideal plasma for both single-pulse − and double-pulse LIBS , in bulk water.…”

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confidence: 99%

CaOH Molecular Emissions in Underwater Laser-Induced Breakdown Spectroscopy: Spatial–Temporal Characteristics and Analytical Performances

et al. 2019

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Recently, molecular emissions from the laser-induced plasma in ambient gas have gained increasing interest; however, very little is known about the case in water solutions. In this work, we investigated the spatiotemporal characteristics of molecular emissions, CaOH for instance, in underwater laser-induced breakdown spectroscopy (LIBS) by using time-resolved spectroscopy, spectral-resolved imaging, and shadowgraph techniques. It was shown that clear CaOH molecular bands can be observed in the spectrum at very early times after the laser pulse and presented a much longer lifetime and more homogeneous emission distribution compared with the Ca I and Ca II lines. Such unique characteristics of CaOH molecular emission inspired us to improve the performances of underwater LIBS by using the CaOH molecular bands instead of Ca I and Ca II lines. We demonstrated the excellent quantification results of CaOH with higher stability, less self-absorption, and reduced matrix effect. Meanwhile, the limit of detection (LOD) of Ca with the CaOH molecular band (2.46 ppm) is comparable to that with the atomic line of Ca I (2.07 ppm), and much lower than that with the ionic line of Ca II (13.81 ppm), indicating a good sensitivity of CaOH. This work gives not only some insights into the molecule formation mechanisms in underwater plasmas, but also provides new ideas to improve the analytical performances of underwater LIBS.

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confidence: 99%

CaOH Molecular Emissions in Underwater Laser-Induced Breakdown Spectroscopy: Spatial–Temporal Characteristics and Analytical Performances

et al. 2019

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“…(2) for the sea-trial data in the field environment, the LIBS signal may also be influenced by the variation of other oceanic parameters such as the temperature [26] and salinity [27]. Nevertheless, the results in figure 7 confirmed that for the in situ application of underwater LIBS in deep-sea, pressure effect is the key factor that affects the LIBS signals compared with the temperature or salinity effect.…”

Section: Comparison With Spectral Data From Sea Trialsmentioning

confidence: 80%

Spectral characteristics of underwater laser-induced breakdown spectroscopy under high-pressure conditions

Wang

Tian

2020

Plasma Sci. Technol.

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Laser-induced breakdown spectroscopy (LIBS) has been proven to be an attractive technique for in situ oceanic applications. However, when applying LIBS into deep-sea, the pressure effect caused by different ocean depths is inescapable and could have great influence on the LIBS signals. In this work, spectral characteristics of underwater LIBS were investigated as a function of pressure in the range of 0.1-45 MPa. A high-pressure chamber built in the laboratory was used to simulate the high-pressure deep-sea environment. Optimal laser energy and detection delay were first determined under different pressure conditions and were shown to be independent of the external pressure. The increase in pressure has a significant impact both on the peak intensity and line broadening of the observed spectra. The peak intensity of Na, Li and K lines increases with the increasing pressure until a maximum intensity is reached at 12.5 MPa. Above this value, the peak intensity decreases gradually up to 45 MPa. For Ca line, the maximum intensity was observed at 30 MPa. The line broadening keeps constant at low pressures from 0.1-10 MPa, while it increases linearly at higher pressures, indicating a higher electron density caused by the compression effect of the high external pressure. We also compared the spectral data obtained from the high-pressure chamber and from the field sea trials, and the good consistency between the laboratory data and sea-trial data suggested the key role of pressure effect on underwater LIBS signals for practical deep-sea applications.

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“…These have been verified on a solid sample ( e.g. aluminum, aluminum alloy, steel, iron, slag, glass, silicon, soil, rock, gold, copper, brass, copper–zinc alloy, molybdenum–tungsten alloy, magnesium, germanium, titanium, inconel superalloys, nickel, tissue, and particles), 19,20,22,23,25–34,36,41–59 gas sample, 39 and liquid sample (water, molten metals, and molten salts) 60–65 by many researchers. For example, increasing the sample temperature results in a larger mass and volume of the laser ablation crater, stronger signal intensity and SNR, higher plasma temperature and electron density, and improved detection performance.…”

Section: Introductionmentioning

confidence: 80%

“…Because of the increasing thermal expansivity and decrease in viscosity with the water temperature, the intensity, plasma temperature, electron density, and plasma plume size were higher at higher water temperature. 64 J. J. Lin et al studied the effects of water temperature on the ability of LIBS for online monitoring of water quality with the sampling method of liquid jets. With the optimal temperature, the signal intensity, signal-to-background ratio (SBR), accuracy, and LoD were improved.…”

Section: Introductionmentioning

confidence: 99%

Effect of liquid aerosol temperature on the detection performance of LIBS for analysis of phosphorus element in water

Yang,

Wang,

et al. 2024

J. Anal. At. Spectrom.

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EXPRESS: Effects of Ambient Temperature on Laser-Induced Plasma in Bulk Water

Cited by 4 publications

References 26 publications

CaOH Molecular Emissions in Underwater Laser-Induced Breakdown Spectroscopy: Spatial–Temporal Characteristics and Analytical Performances

CaOH Molecular Emissions in Underwater Laser-Induced Breakdown Spectroscopy: Spatial–Temporal Characteristics and Analytical Performances

Spectral characteristics of underwater laser-induced breakdown spectroscopy under high-pressure conditions

Effect of liquid aerosol temperature on the detection performance of LIBS for analysis of phosphorus element in water

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