25 April 2008 Millimeter wave imaging for concealed weapon detection and surveillance at up to 220 GHz
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Sensors used for security purposes have to cover the non-invasive control of men and direct surroundings of buildings and camps to detect weapons, explosives and chemical or biological threat material. Those sensors have to cope with different environmental conditions. Ideally, the control of people has to be done at a longer distance as standoff detection. The work described in this paper concentrates on passive radiometric sensors at 0.1 and 0.2 THz which are able to detect non-metallic objects like ceramic knifes. Also the identification of objects like mobile phones or PDAs will be shown. Additionally, standoff surveillance is possible, which is of high importance with regard to suicide bombers. The presentation will include images at both mentioned frequencies comparing the efficiency in terms of range and resolution. In addition, the concept of the sensor design showing a Dicke-type 220GHz radiometer using new LNAs and the results along with image enhancement methods are shown. 2.1 Main principle
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Stanko, D. Nötel, J. Huck, S. Wirtz, F. Klöppel, H. Essen, "Millimeter wave imaging for concealed weapon detection and surveillance at up to 220 GHz", Proc. SPIE 6948, Passive Millimeter-Wave Imaging Technology XI, 69480N (25 April 2008); doi: 10.1117/12.784445; https://doi.org/10.1117/12.784445


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