Atmosphere issues in detection of explosives and organic residues

C. G. Brown; M. Baudelet; C. Bridge; M. K. Fisher; M. Sigman; P. J. Dagdigian; M. Richardson

doi:10.1117/12.819243

8 May 2009 Atmosphere issues in detection of explosives and organic residues

C. G. Brown, M. Baudelet, C. Bridge, M. K. Fisher, M. Sigman, P. J. Dagdigian, M. Richardson

Proceedings Volume 7304, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing X; 73041D (2009) https://doi.org/10.1117/12.819243
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

This study makes a comparison of LIBS emission from molecular species in plasmas produced from organic residues on a non-metallic substrate by both a 5 ns Nd:YAG laser (1064 nm) and a 40 fs Ti:Sapphire laser (800 nm) in air and argon atmospheres. The organic samples analyzed had varying amounts of carbon, nitrogen, hydrogen, and oxygen in their molecular structure. The characterization was based on the atomic carbon, hydrogen, nitrogen, and oxygen lines as well as the diatomic species CN (B²Σ⁺ - X²Σ⁺) and the C₂ (d³Π_g - a³Π_u). Principal Component Analysis (PCA) was used to identify similarities of the organic analyte via the emission spectra. The corresponding Receiver Operating Characteristics (ROC) curves show the limitations of the PCA model for the nanosecond regime in air.

Citation Download Citation

C. G. Brown, M. Baudelet, C. Bridge, M. K. Fisher, M. Sigman, P. J. Dagdigian, and M. Richardson "Atmosphere issues in detection of explosives and organic residues", Proc. SPIE 7304, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing X, 73041D (8 May 2009); https://doi.org/10.1117/12.819243

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