White powder identification using broadband coherent light in the molecular fingerprint region

Luke Maidment, Peter G. Schunemann, Derryck Telford Reid

Research output: Contribution to journalArticle

3 Citations (Scopus)
34 Downloads (Pure)

Abstract

We show that a variety of white powder samples, including painkillers, amino acids, stimulants and sugars are readily discriminated by diffuse reflectance infrared spectroscopy involving no preparation of the sample and no physical contact with it. Eleven powders were investigated by illuminating each sample with broadband coherent light in the 8–9-µm band from an OPGaP femtosecond optical parametric oscillator. The spectra of the scattered light were obtained using Fourier-transform spectroscopy. Similarities between different spectra were quantified using Pearson’s correlation coefficient, confirming that spectral features in the 8–9-µm wavelength region were sufficient to discriminate between all eleven powders evaluated in the study, offering a route to simple and automated non-contact chemical detection.
Original languageEnglish
Pages (from-to)25364-25369
JournalOptics Express
Volume26
Issue number19
Early online date13 Sep 2018
DOIs
Publication statusPublished - 17 Sep 2018

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