For this reason, increasing the operating frequency of the systems is desired, but in practice is hard to realize due to the lack of affordable, low noise amplifiers well beyond 100 GHz. In this paper we present a passive terahertz imaging system which acquires passive terahertz (~200 GHz - ~1 THz) imagery near video frame rate. The system, one copy of which is built in Finland and the other in the U.S., is based on a 64 pixel linear array of superconducting antenna-coupled microbolometers operated within a commercial cryogen-free closed cycle cryocooler, and utilizes conical scanning Schmidt optics.
Quantitative measurements on the imager resolution metrics (thermal, spatial and temporal) will be presented.
The results from field tests at the Helsinki-Vantaa airport will be presented.
|Title of host publication||Proceedings of SPIE|
|Subtitle of host publication||Passive Millimeter-Wave Imaging Technology XIII|
|Editors||David A. Wikner, Arttu R. Luukanen|
|Publisher||International Society for Optics and Photonics SPIE|
|Publication status||Published - 2010|
|MoE publication type||B3 Non-refereed article in conference proceedings|
|Event||SPIE Defense, Security, and Sensing. Passive Millimeter-Wave Imaging Technology XIII - Orlando, Florida, United States|
Duration: 5 Apr 2010 → 9 Apr 2010
|Series||Proceedings of SPIE|
|Conference||SPIE Defense, Security, and Sensing. Passive Millimeter-Wave Imaging Technology XIII|
|Period||5/04/10 → 9/04/10|
- cryogenic sensors
- stand-off detection
- video rate