Real-time in situ detection of the local air pollution with laser-induced breakdown spectroscopy

Qu, Yingfei; Zhang, Qihang; Yin, Wang; Hu, Yuchen; Liu, Yuzhu

doi:10.1364/oe.27.00a790

Cited by 36 publications

(8 citation statements)

References 26 publications

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“…LIBS offers distinct advantages for in situ, real-time, standoff, and contactless detection, and it requires less sample preparation and consumption [2]. This technique is widely applied to the fields of energetic materials [3], metallurgical engineering [4], space exploration [2], industry manufacture [5], food safety [6], environmental monitoring [7], agricultural product [1], resources and energy [8], archaeology [9], and clinical diagnostics [10]. However, the stability and repeatability of the plasma emission, along with the detection accuracy, are easily altered by the wavelength of the input light, pulse duration and its energy, the distance of lens-to-sample, and the target characteristics.…”

Section: Introductionmentioning

confidence: 99%

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Chen

Deng

et al. 2022

Advances in High Energy Physics

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To study the effects of focusing distance on the characteristics of copper plasma, a picosecond laser is utilized to ablate a pure copper plate to generate a plasma spectrum. Following numerous experiments on the subject, three significant factors are determined: lens focal length, pulse energy, and the lens-to-sample distance. These factors are employed to analyze the spectral intensity, plasma temperature, and electron density in the local thermodynamic equilibrium (LTE) and optically thin condition. Due to the shielding effects of mixed plasma, the strongest spectral intensity is achieved in the prefocused case, no matter how much beam irradiance is employed. The more intensive the beam irradiance is, the more the optimal position is distant from the focal point. The variation of plasma temperature and electron density showed a peak in the prefocused case, which is consistent with the trend of spectral intensity. For the case of extremely high irradiance (on the focus), the shielding effects become seriously, and the resultant above three factors decreased sharply. When a longer-focal-length lens is employed, the spectral intensity exhibited an obvious bimodal trend. In the prefocused case, a longer-focal-length lens is helpful to eliminate the effects of the roughness of the target surface compared with a shorter one. Finally, the assumed LTE is validated by McWhirter relation, plasma relaxation time, and diffusion length, and the optically thin condition was also validated by spectral intensity ratio. We hope that this work could be an important reference for the future design of highly optimized experiments for Calibration-Free Laser-Induced Breakdown Spectroscopy (CF-LIBS).

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Section: Introductionmentioning

confidence: 99%

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Chen

Deng

et al. 2022

Advances in High Energy Physics

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“…65,66 Qu et al studied the online real-time detection of smoke by using a mosquito-repelling incense as a representative example of local air pollution. 67 Metal elements, including Mg, Fe, Ca, and Ti, as well as some toxic elements, such as Sr, Cr, and Cd, were simultaneously observed in the spectra. Furthermore, there was also a characteristic spectral line of F I (685.6 nm) in the spectra, which proved the existence of meperfluthrin (C17H16Cl2F4O3) in the mosquito-repelling smoke.…”

Section: Atmospheric Pollution Sourcesmentioning

confidence: 92%

Review of In-Situ Online LIBS Detection in the Atmospheric Environment

Zhang¹,

Liu²

2021

At.Spectrosc.

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The aim of this review is to provide a brief introduction to recent research advances in in-situ online detection of atmospheric pollutants based on laser-induced breakdown spectroscopy (LIBS) under atmospheric environments. Atmospheric pollution has drawn much public attention, and there is increasing demand for rapid and accurate evaluation of atmospheric environments. LIBS has the advantages of in-situ online detection, simultaneous multi-element analysis, and noncontact measurement, making it a highly competitive analytical technique in the field of environmental monitoring. In terms of the different target samples, some typical research cases, including atmospheric particulate matter, atmospheric pollution sources, halogens in VOCs, atmospheric sulfur, and stable isotope abundance, are presented to illustrate the current development and problems of LIBS detection in this field.

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“…Spectroscopy technique, such as quartz‐enhanced photoacoustic spectroscopy (QEPAS), light‐induced thermoelastic spectroscopy (LITES), and laser‐induced breakdown spectroscopy (LIBS), has the advantages of high sensitivity, noncontact measurement, real‐time in situ, and can be apply in the exploration in the outer space 6–13 . LIBS is a remote and real‐time detection 7,10,14–16 suitable for geological exploration both on earth and outside earth. In the process, laser pulses hit the sample surface, turning the material on the sample surface into a plasma.…”

Section: Introductionmentioning

confidence: 99%

Rapid detection and identification of rocks and minerals by laser‐induced breakdown spectroscopy

Huang

Zhou

Zhu

et al. 2023

Micro & Optical Tech Letters

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In geological exploration, it is necessary to analyze the geological history according to the rock types. But in places for people to reach, sample collection, and transportation is a costly task. At present, the remote intelligent detection of rock types needs to be further developed. In this study, laserinduced breakdown spectroscopy (LIBS), a sensitive optical technique that can rapidly analyze various elements, is applied to real-time detection and analysis of rock types. Representative rock samples and minerals are selected for spectral analysis and machine learning. The characteristic spectral lines of Ca, Al, Mg, Ti, Si, Na, Fe, K, and Li were observed in the spectra. By comparing the spectra of different samples, the differences among them were discussed.First, principal component analysis (PCA) is used for dimensionality reduction. With the help of PCA, the data are distributed in twodimensional and three-dimensional space and different kinds of rocks and minerals are classified successfully. Then, combined with error back propagation training artificial neural network, the rock and mineral identification model was established, and the recognition rate can reach 100%. The results show that LIBS is a powerful tool for remote intelligent realtime rock detection and classification, and has great application prospects in the exploration of extraterrestrial objects including planets, satellites and asteroids in the future.

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Real-time in situ detection of the local air pollution with laser-induced breakdown spectroscopy

Cited by 36 publications

References 26 publications

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Role of Focusing Distance in Picosecond Laser-Induced Cu Plasma Spectra

Review of In-Situ Online LIBS Detection in the Atmospheric Environment

Rapid detection and identification of rocks and minerals by laser‐induced breakdown spectroscopy

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