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As a Wi-Fi signal is transmitted at a wall, a portion of the signal penetrates through it, reflecting off any humans on the other side. However, only a tiny fraction of the signal makes it through to the other room, with the rest being reflected by the wall, or by other objects. “So we had to come up with a technology that could cancel out all these other reflections, and keep only those from the moving human body,” Katabi says.
To do this, the system uses two transmit antennas and a single receiver. The two antennas transmit almost identical signals, except that the signal from the second antenna is the inverse of the first. As a result, the two signals interfere with each other in such a way as to cancel each other out. Since any static objects that the signals hit — including the wall — create identical reflections, they too are cancelled out by this nulling effect.
Originally posted by Latrodectus
I wonder how a thing like this would work from indoors to outdoors. That way you could secure different areas of your property. It seems like just a small step ahead of a motion sensor really, accept that this sensor actually tells you the position and orientation of the subject in real time.
Originally posted by sylent6
1. Police will watch you all day and all night.
2. Criminals and goons will watch you all day and all night.
3. Employers will watch you all day and all night.
4. Your "mother" will watch you all day and all night.
Who am I missing?
Again good technology in the hands of the wicked and evil.
Originally posted by littled16
reply to post by snarky412
I wonder how long it will be before this technology becomes all the rage with peeping Tom's? There's not a doubt in my mind that my freaky neighbor will have one as soon as it's available to the public. I guess I better get ready to line my walls with lead or something. Freaking technology!
Lol peeping toms. I get the image of some dudes getting all hot and bothered staring intently at their laptop screen, to the images of raster scan lines outlining a sexless form of a human body.
If the microwave energy is coming from outside your home (such as from Smart meters or cell phones towers close to you), you can reduce the penetratiion of those RF energy fields into your home by enclosing your living space with an all metal enclosure. The ideal shielded room would have continuous, solid metal coverings on all four walls, the ceiling and floor (the equivalent of an all metal box), and then be grounded to earth. The more dense and thicker the metal, the better the shielding (E.g. lead or gold foil will shield better than aluminum foil, but copper is often used for RF shielding because it's a good conductor of electrons and not exceedingly expensive). The very best metal for blocking RF energy is an alloy called Mu metal, but it is extremely and prohibitively expensive to buy. The shielding ideas I will describe here will start with the least expensive (and easy to obtain) and move towards the more expensive, and more difficult to install.
Aluminized Mylar Blankets, The Least Expensive Method
MYlar Energy BlanketTo minimize microwave energy fields entering your home from Smart Meters or your abutting neighbor's wireless computer router transmitter, you can line your interior walls with aluminized Mylar sheeting called "energy blankets" typically found at sporting good stores, or camping equipment stores, or even from drug stores in some areas. The ones I bought are called "Space brand, Emergency Blanket, First-Aid Thermal Blanket" (available from www.warmers.com). I paid $3.99 each, purchased at a local Big 5 sporting goods store (but now available online for $2 each, 1/2 price). The "blanket" is made of thin Mylar plastic with an aluminum coating on one side. The one I bought measures 56 inches x 84 inches and weighs 3 oz.