Recent advances in laser-induced breakdown spectroscopy for explosive analysis

Ding, Jinchang; Zhang, Tianlong; Li, Hua

doi:10.1016/j.trac.2023.117197

Cited by 10 publications

(2 citation statements)

References 112 publications

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“…The femtosecond pulsed laser ablation (fs-PLA) is a process that removes a portion of the material from the solid surface of the solid target by a focused femtosecond pulsed laser beam [1][2][3][4]. Due to the controllable nature of the method, fs-PLA is used in different fields, including medicine [5], additive manufacturing [6], spectroscopy [7], among others.…”

Section: Introductionmentioning

confidence: 99%

Modelling thermal energy transfer in a femtosecond pulsed laser ablation of metal using a coupled spring-mass oscillator

Sagisi,

Casero,

Floro

et al. 2024

Phys. Scr.

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Femtosecond pulsed laser ablation (fs-PLA) is an interesting but complicated field of study especially for undergraduate students entering the field. Hence, a bridging concept using classical and mechanical analog will be helpful. In this paper, we modelled the thermal energy transfer between electron and lattice system in a fs-PLA of metal described by two temperature model (TTM) using a coupled spring-mass oscillator. This was achieved by providing correspondence of TTM parameters to the coupled spring-mass oscillator, with temperature as position, electron thermal conductivity as coefficient of friction, electron-phonon coupling factor as spring term, electron/lattice heat capacity as the mass $m_1$/$m_2$ respectively, and laser source term as the driving force. The thermophysical properties considered are temperature dependent leading to position dependent parameters of coupled spring-mass oscillator. Results showed that the coupled spring-mass oscillator exhibit many behavior similar to the TTM. Additionally, maximum positions achieved by $m_2$ behave similarly with maximum lattice temperature after achieving certain threshold value. However, many features of TTM such as spatial dependence and crater formation are not observed in the coupled spring-mass oscillator. Despite its limitation, the coupled spring-mass oscillator model was able to represent many features of the thermal energy transfer of fs-PLA, and could be an easy and useful model in understanding fs-PLA.

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Section: Introductionmentioning

confidence: 99%

Modelling thermal energy transfer in a femtosecond pulsed laser ablation of metal using a coupled spring-mass oscillator

Sagisi,

Casero,

Floro

et al. 2024

Phys. Scr.

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“…[ 6 , 17 , 18 , 19 , 20 , 21 ]. Differently, recognition of explosives by LIBS where the main elements in the sample are C, H, N, and O, the first two present in organic compounds and the last present in the air surrounding, requires adopting some discrimination strategy based on the line intensity ratios, chemometrics or spectral changes caused by laser induced micro-explosion on energetic materials [ 14 , 15 , 16 , 22 , 23 ]. By using a standoff LIBS system, the analysis of targets, including hazardous materials of forensic interest, can be performed at a safe distance [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel LIBS Sensor for Sample Examinations on a Crime Scene

Lazic,

Andreoli,

Almaviva

et al. 2024

Sensors

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In this work, we present a compact LIBS sensor developed for characterization of samples on a crime scene following requirements of law enforcement agencies involved in the project. The sensor operates both in a tabletop mode, for aside measurements of swabbed materials or taken fragments, and in handheld mode where the sensor head is pointed directly on targets at the scene. The sensor head is connected via an umbilical to an instrument box that could be battery-powered and contains also a color camera for sample visualization, illumination LEDs, and pointing system for placing the target in focus. Here we describe the sensor’s architecture and functionalities, the optimization of the acquisition parameters, and the results of some LIBS measurements. On nano-plotted traces at silica wafer and in optimized conditions, for most of the elements the detection limits, in term of the absolute element masses, were found to be below 10 picograms. We also show results obtained on some representative materials, like fingerprints, swabbed soil and gunshot residue, varnishes on metal, and coated plastics. The last, solid samples were used to evaluate the depth profiling capabilities of the instrument, where the recognition of all four car paint layers was achieved.

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