These are the clear, cylindrical scanners using millimeter wave technology and sold by L-3 Communications.
Transmissions In the millimeter wave band are easily absorbed by rain drops, humidity has significant impact.
In the U.S., the TSA uses both types of scanners: 250 X-ray scanners and 264 millimeter wave scanners.
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But while manufacturers of the less-intrusive "millimeter wave" machines found ways to use ATR software, backscatter machines have not.
What was intriguing to me was a claim of transmitting data in the millimeter wave band to a distance of two kilometers.
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Transmissions in the millimeter wave band do not pass through building walls.
My initial interest was due to my electrical engineering background, I always thought that millimeter wave band was not suitable for long distance transmissions.
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Transmissions in the millimeter wave band are attenuated even by trees.
Backscatter machines use X-rays, while millimeter wave machines use radio waves.
Lee of TSA emphasized that the images Coney refers to do not represent millimeter wave technology but rather "backscatter" technology, which she said TSA is not using at this time.
Similarly, do I want and did I sign up to be exposed to potentially harmful Millimeter Wave scans which are also under the control of those same possibly incompetent-to-the-task personnel?
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Rotenberg said he still has privacy concerns about millimeter wave machines, including what information is captured by the machine -- even if unseen by screeners -- and how long that information is retained.
The blurry X-ray images leave lots to the imagination as they come from a millimeter wave machine, rather than the higher resolution backskatter machines the TSA uses both, made by L-3 Communications Holdings Inc. and OSI Systems Inc.
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Using millimeter wave technology, which the TSA says emits 10, 000 times less radio frequency than a cell phone, the machine scans a traveler and a robotic image is generated that allows security personnel to detect potential threats -- and, some fear, more -- beneath a person's clothes.
Instead of X-ray scanners, European airports will use millimeter-wave scanners that utilize low-energy radio waves.
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Would any of us have objected to the deployment of millimeter-wave scanners had the technology been available then?
Passengers who are asked to undergo a second screening can choose a pat-down search or the millimeter-wave test.
In addition to the backscatter machines, the TSA has also deployed about 260 millimeter-wave machines which use radio waves and do not emit X-rays.
The other uses millimeter-wave technology, which shows a detailed photo negative.
The TSA plans to deploy 1, 275 backscatter and millimeter-wave scanners covering more than half its security lanes by the end of 2012 and 1, 800 covering nearly all the lanes by 2014.
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