Journal
SENSORS
Volume 15, Issue 6, Pages 12103-12132Publisher
MDPI
DOI: 10.3390/s150612103
Keywords
transmitted and reflected THz pulse with a few cycles; pulsed Time-Domain Spectroscopy; spectral dynamics analysis method; detection and identification of explosives; integral correlation criteria
Funding
- Russian Science Foundation [14-21-00081]
- Russian Science Foundation [14-21-00081] Funding Source: Russian Science Foundation
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We propose an effective method for the detection and identification of dangerous substances by using the broadband THz pulse. This pulse excites, for example, many vibrational or rotational energy levels of molecules simultaneously. By analyzing the time-dependent spectrum of the THz pulse transmitted through or reflected from a substance, we follow the average response spectrum dynamics. Comparing the absorption and emission spectrum dynamics of a substance under analysis with the corresponding data for a standard substance, one can detect and identify the substance under real conditions taking into account the influence of packing material, water vapor and substance surface. For quality assessment of the standard substance detection in the signal under analysis, we propose time-dependent integral correlation criteria. Restrictions of usually used detection and identification methods, based on a comparison between the absorption frequencies of a substance under analysis and a standard substance, are demonstrated using a physical experiment with paper napkins.
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