Passive imaging of concealed objects in terahertz and long-wavelength infrared

Terahertz and infrared radiation have unique properties applicable to the field of surveillance and security systems. We investigated the possibility of detecting potentially dangerous objects covered by various types of clothing using passive imagers operating at 1.2 mm (250 GHz) and long-wavelengt...

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Bibliographic Details
Published in:Applied optics (2004) 2015-05, Vol.54 (13), p.3826-3833
Main Authors: Kowalski, Marcin, Kastek, Mariusz, Walczakowski, Michal, Palka, Norbert, Szustakowski, Mieczyslaw
Format: Article
Language:English
Subjects:
Dangerous
Infrared
Infrared radiation
Passive imaging
Physical properties
Spectra
State of the art
Surveillance
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Summary:Terahertz and infrared radiation have unique properties applicable to the field of surveillance and security systems. We investigated the possibility of detecting potentially dangerous objects covered by various types of clothing using passive imagers operating at 1.2 mm (250 GHz) and long-wavelength infrared at 6-15 [mu]m (20-50 THz). We developed a measurement methodology that assumes to investigate theoretical limitations, performance of imagers, and physical properties of fabrics. To evaluate stability of the detection capabilities of imagers, we performed measurement sessions each lasting 30 min. We present a theoretical comparison of the two spectra and results of experiments using state-of-the-art equipment.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.54.003826