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millimeter wave scanner
A millimeter wave scanner is a whole-body imaging device used for detecting objects concealed underneath a person’s clothing using a form of electromagnetic radiation. Typical uses for this technology include detection of items for commercial loss prevention, smuggling and screening at government buildings and airport security checkpoints. Several countries employ the scanners for security screening.〔
It is one of the common technologies of full body scanner used for body imaging; a competing technology is backscatter X-ray. Millimeter wave scanners themselves come in two varieties: active and passive. Active scanners direct millimeter wave energy at the subject and then interpret the reflected energy. Passive systems create images using only ambient radiation and radiation emitted from the human body or objects.
==Technical details==
Clothing and many other materials are translucent to EHF radio frequency bands,〔(Scanner recognises hidden knives and guns ). Newscientist.com (2006-09-26). Retrieved on 2012-12-31.〕 including the 24–30 GHz band emitted by millimeter-wave scanners.〔http://www.sciencedirect.com/science/article/pii/S1687850714000168, section 2〕〔https://books.google.com/books?id=uI0NjbozIt0C&pg=PA183&lpg=PA183&dq=smiths+eqo+wavelength&source=bl&ots=hU1H9LxmdB&sig=zwB0pWQPWk9RBHPVl8v2CuB6I5Q&hl=en&sa=X&ved=0CDYQ6AEwA2oVChMIv6ia_vX5xwIVWBmSCh0jPAz0#v=onepage&q=smiths%20eqo%20wavelength&f=false〕〔http://www.aapm.org/meetings/amos2/pdf/59-15087-8367-626.pdf〕
With active scanners, the millimeter wave is transmitted from two antennas simultaneously as they rotate around the body. The wave energy reflected back from the body or other objects on the body is used to construct a three-dimensional image, which is displayed on a remote monitor for analysis.〔〔〔(TSA: Imaging technology ). tsa.gov〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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