Discrimination of bimetallic alloy targets using femtosecond filament-induced breakdown spectroscopy in standoff mode

Shaik, Abdul Kalam; Ajmathulla,; Soma, Venugopal Rao

doi:10.1364/ol.43.003465

Cited by 20 publications

(7 citation statements)

References 29 publications

(30 reference statements)

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“…Compared with other techniques, like atomic absorption spectroscopy and inductively coupled plasma optical emission spectroscopy, LIBS has some unique advantages including the capacity of direct analysis without a complex pretreatment of the sample, rapid response, and multiple elemental analysis ability. LIBS is suitable for special requirements of practical solid, [1][2][3][4] liquid, [5][6][7][8] and gas analyses. 9,10 For traditional LIBS systems, nanosecond (ns) pulse lasers are widely used.…”

Section: Introductionmentioning

confidence: 99%

Plasma-grating-induced breakdown spectroscopy

Peng

Niu

et al. 2020

Adv. Photon.

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Laser-induced breakdown spectroscopy (LIBS) is a useful tool for determination of elements in solids, liquids, and gases. For nanosecond LIBS (ns-LIBS), the plasma shielding effect limits its reproducibility, repeatability, and signal-to-noise ratios. Although femtosecond laser filament induced breakdown spectroscopy (FIBS) has no plasma shielding effects, the power density clamping inside the filaments limits the measurement sensitivity. We propose and demonstrate plasma-grating-induced breakdown spectroscopy (GIBS). The technique relies on a plasma excitation source-a plasma grating generated by the interference of two noncollinear femtosecond filaments. We demonstrate that GIBS can overcome the limitations of standard techniques such as ns-LIBS and FIBS. Signal intensity enhancement with GIBS is observed to be greater than 3 times that of FIBS. The matrix effect is also significantly reduced with GIBS, by virtue of the high power and electron density of the plasma grating, demonstrating great potential for analyzing samples with complex matrix.

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Section: Introductionmentioning

confidence: 99%

Plasma-grating-induced breakdown spectroscopy

Peng

Niu

et al. 2020

Adv. Photon.

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“…Typically, the spectral data of characteristic lines are extracted from the spectra and used as a sample set to establish a suitable classification model. Currently, the most common algorithms used in LIBS analysis are principal component analysis (PCA), [82][83][84][85] linear discriminant analysis (LDA), [86][87][88] support vector machine (SVM), [89][90][91] random forest (RF), [92][93][94] and artificial neural networks (ANN). [95][96][97][98] For the classification of pollutants, these methods work equally well.…”

Section: Atmospheric Pollution Sourcesmentioning

confidence: 99%

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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“…Depending on the lens combinations one can focus the pulses at few meters to few hundreds of meters. We had earlier successfully investigated bimetallic targets (Ag@ Au, Ag@Cu) 40 and a set of six energetic imidazoles 41 in the same configuration. In both cases we could achieve excellent discrimination using the PCA.…”

Section: Discrimination Of Hems In St-fibs2 (Configuration 3) Using Femtosecond Filamentsmentioning

confidence: 99%

Femtosecond Filaments for Standoff Detection of Explosives

Soma

Shaik

2020

Def. Sc. Jl.

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In this report, we present our results from various studies to qualitatively discriminate the common military explosives viz. RDX, TNT and HMX in their pure form at a distance of ~6.5 m in standoff mode using femtosecond (fs) filament induced breakdown spectroscopy technique (fs FIBS) together with principal component analysis. A ~30 cm length fs filament obtained by a two-lens configuration was used to interrogate those energetic molecules in the form of pressed pellets (150 mg each). The plasma emissions were collected by a Schmidt-Cassegrain telescope (SCT) from a distance of ~8 m away from the investigation zone. Additionally, a few significant results obtained from the LIBS-based investigations of nitroimidazoles with respect to the standoff distance (~2 m) are discussed. Furthermore, we have also summarised a few important results from our recent investigations of bulk energetic materials in various configurations (including those with fs filaments). The results obtained from various fs FIBS configurations corroborate that the filament generation and its properties, the size and f-number of collection optics influence signal strength in the FIBS technique. These results project the fs FIBS technique as a potential technique for investigations aimed at hazardous materials and harsh environments in the standoff mode.

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Discrimination of bimetallic alloy targets using femtosecond filament-induced breakdown spectroscopy in standoff mode

Cited by 20 publications

References 29 publications

Plasma-grating-induced breakdown spectroscopy

Plasma-grating-induced breakdown spectroscopy

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

Femtosecond Filaments for Standoff Detection of Explosives

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