Ultraviolet-visible spectroscopic characterisation of automotive window tints for forensic purposes

Pal, Karin J. van der; Marić, Mark; Bronswijk, Wilhelm van; Lewis, Simon W.

doi:10.1039/c5ay01381j

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…In this regard, it demands for an optical technique to discriminate such materials. Fourier transform infrared spectroscopy 45 and ultraviolet visible spectroscopy 46 have been used for this purpose but each technique has its own merits and demerits. Because THz-TDS accounts for the phase information, it is therefore capable of detecting small changes in the refractive index and such changes cannot be studied using the other discussed optical techniques.…”

Section: Experimental Measurements and Calculationsmentioning

confidence: 99%

Investigation of Dielectric Properties of Polymers and their Discrimination Using Terahertz Time-Domain Spectroscopy with Principal Component Analysis

et al. 2016

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Polymers are among the most commonly used materials in our everyday life. They are generally transparent to terahertz (THz) radiation, but are quite difficult to differentiate using optical techniques as few or no characteristic features exist in the spectral range of <2.0 THz for small and portable radiation systems. In this work, we report experimental measurement of refractive indices and absorption coefficients of styrene acrylonitrile (SAN) and Bakelite in the spectral range of 0.2-2.0 THz for the first time. Additionally, we demonstrate that by combining principle component analysis (PCA) with THz time-domain spectroscopy one can differentiate such polymers. In this analysis, the first three principle components PC1, PC2, and PC3 depict >94% variance with a distribution of 72.45%, 11.52%, and 9.38%, respectively.

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Section: Experimental Measurements and Calculationsmentioning

confidence: 99%

Investigation of Dielectric Properties of Polymers and their Discrimination Using Terahertz Time-Domain Spectroscopy with Principal Component Analysis

et al. 2016

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“…The ideal chemical technique for the discrimination of mushroom species would provide rapid and accurate analysis. Recently, ultraviolet (UV) spectrometry that reflect the comprehensive fuzz information of samples should be accessible as discrimination tool in diverse research fields, such as the analysis of foods [15], herb medicines [16], automotive window tints [17], for the advantages like rapidity, simplicity, and low cost. Additionally, Li et al [18] distinguished wild and cultured Macrocybe gigantea with different storage times based on UV spectroscopy combined with multivariate analyses.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet Spectroscopy Used to Fingerprint Five Wild-Grown Edible Mushrooms (Boletaceae) Collected from Yunnan, China

Zhang

et al. 2016

Journal of Spectroscopy

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Nowadays, wild-grown edible mushrooms which are natural, nutritious, and healthy get more and more popular by large consumers. In this paper, UV spectra of different Boletaceae mushrooms with the aid of partial least squares discriminant analysis (PLS-DA) and hierarchical cluster analysis (HCA) were shown to be a practical and rapid method for discrimination purpose. The specimens of Boletus edulis, Boletus ferrugineus, Boletus tomentipes, Leccinum rugosiceps, and Xerocomus sp. were described based on the UV spectra. From the results, all the specimens were characterized by strong absorption at the wavelengths of 274 and 284 nm and showed the shoulder at 296 nm. However, changes could be seen in the peak heights at the same wavelength for different samples. After analyzing by chemometrics, visual discrimination among samples was presented and the relationships among them were also obtained. This study showed that UV spectroscopy combined with chemometrics methods could be used successfully as a simple and effective approach for characterization of these five wild-grown edible mushrooms at species and genus levels. Meanwhile, this rapid and simple methodology could also provide reference for the discrimination of edible mushrooms.

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Discrimination of automotive window tint using ATR-FTIR spectroscopy and chemometrics

Grant

Sauzier

Lewis

2020

Forensic Science International

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Ultraviolet-visible spectroscopic characterisation of automotive window tints for forensic purposes

Abstract: Transmission ultraviolet-visible spectroscopy was used in combination with chemometrics to examine the potential of automotive window tint as forensic evidence.

Cited by 5 publications

References 9 publications

Investigation of Dielectric Properties of Polymers and their Discrimination Using Terahertz Time-Domain Spectroscopy with Principal Component Analysis

Investigation of Dielectric Properties of Polymers and their Discrimination Using Terahertz Time-Domain Spectroscopy with Principal Component Analysis

Ultraviolet Spectroscopy Used to Fingerprint Five Wild-Grown Edible Mushrooms (Boletaceae) Collected from Yunnan, China

Discrimination of automotive window tint using ATR-FTIR spectroscopy and chemometrics

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