IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
Passive imaging and emissivity measurement with a 4K-cryocooled terahertz photoconductive detector
Makoto AokiSaroj R. TripathiMasanori TakedaNorihisa Hiromoto
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2012 Volume 9 Issue 5 Pages 333-338


We have demonstrated terahertz (THz) passive imaging of room-temperature objects using a 4K-cryocooled THz photoconductive detector with background limited infrared performance (BLIP) at around 1.5-2.5THz. Images of a safety razor blade and a coin concealed in a plastic package or an envelope are successfully obtained with spatial resolutions of wavelength order using the THz passive imaging system. We have compared the measured THz intensity of several materials with emissivities calculated using the reported optical constants. The result shows that the THz intensity has a good linear relation to the emissivity, which means THz emissivity of an unknown material can be estimated at a room-temperature with the THz passive imaging system.

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© 2012 by The Institute of Electronics, Information and Communication Engineers
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