This article provides information about using terahertz radiation based methods such as time-domain spectroscopy, ATR
spectroscopy and terahertz reflection imaging for distinguishing of different kinds of gunpowder. The findings in this
article prove that gunpowder does not have any sharp peaks in terahertz region of electromagnetic spectrum up to
2.5 THz, but also prove that distinguishing of different kinds of gunpowder is possible using different methods based on
terahertz radiation. All presented results are connected to absorbance of gunpowder and other measured materials,
because comparison of absorbance analysis is essential for distinguishing of gunpowder samples.
This article contains information about using terahertz time-domain spectroscopy for the security industry, particularly for distinguishing chosen different kinds of gunpowder. The original focus of described research was the observation of characteristic spectrum of gunpowder (spectral fingerprint) in the terahertz range of the electromagnetic spectrum to use the terahertz radiation for gunpowder detection and identification. The results of this research lead to the finding that researched samples of gunpowder do not have any characteristic spectral lines or peaks in the terahertz range of the electromagnetic spectrum up to 2 THz. However, the comparison of samples of different kinds of gunpowder proves the possibility of their distinguishing by their absorbance (absorption spectrum). Introduction information about motivation of authors, methods of measurement, samples preparation, results of measurements with their interpretation and discussion about the results with conclusion are the main parts of this article.
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