Jump to main content
Jump to site search

Issue 14, 2016
Previous Article Next Article

A FT-NIR spectroscopy methodology to estimate firing distance based on the direct analysis of the bullet impact surface

Author affiliations

Abstract

A new methodology to estimate firing distance based on the direct analysis of organic components of gunshot residues (GSRs) on the bullet impact surface using Fourier transform near-infrared (FT-NIR) spectroscopy is proposed. Mathematical models relating firing distance with spectral information were developed using data obtained from a series of shots performed with a Glock model 17C (114 mm barrel length and 9 × 19 mm cartridges) at different distances, from 20 to 90 cm, against a white 40 × 40 cm square cloth (70% polyester/30% cotton) target. The study was repeated with two different types of ammunition. Spectra were obtained around the bullet entrance hole at 4 perpendicular directions and at 5 radial distances in diffuse reflectance mode with the assistance of a fiber optic probe. Principal component analysis showed that FT-NIRS displayed sensitivity in the recognition of the differences between the GSRs from the two different types of ammunition. Partial least squares regression models allowed the estimation of firing distance for both types of ammunition. Prediction errors lower than 11 cm were obtained for shots up to 90 cm.

Graphical abstract: A FT-NIR spectroscopy methodology to estimate firing distance based on the direct analysis of the bullet impact surface

Back to tab navigation

Publication details

The article was received on 29 Jan 2016, accepted on 10 May 2016 and first published on 11 May 2016


Article type: Paper
DOI: 10.1039/C6AN00247A
Citation: Analyst, 2016,141, 4410-4416
  •   Request permissions

    A FT-NIR spectroscopy methodology to estimate firing distance based on the direct analysis of the bullet impact surface

    J. M. G. Sarraguça, C. Lima, F. Machado, J. A. Lopes, A. Almeida, L. Fernandes, T. Magalhães and A. Santos, Analyst, 2016, 141, 4410
    DOI: 10.1039/C6AN00247A

Search articles by author

Spotlight

Advertisements