peacepink

Worldwide Campaign to stop the Abuse and Torture of Mind Control/DEWs

Some victims believed that they are surveillanced by remote viewing "See through Wall" technologies. I sorted some "See through Wall" technologies here just for a starting to know some basic surveillance technologies.

These technologies are not 100% associated with mind reading, mind control abuses and tortures.

 

Current See Through Wall technologies

(1)Functional MRI

(2)Ultrasound pulse-echo imaging

Ultrasonic imaging is the second most often used imaging modality in medicine, as well as in military

(3)       Ultra-Wideband (UWB)

is a technology for transmitting information spread over a large bandwidth (>500 MHz) that should, in theory and under the right circumstances, be able to share spectrum with other users. Regulatory settings of Federal Communications Commission (FCC) in United States are intended to provide an efficient use of scarce radio bandwidth while enabling both high data rate "personal area network" (PAN) wireless connectivity and longer-range, low data rate applications as well as radar and imaging systems.

(4)       Infrared Xray

The infrared spectrum is over three thousand times wider than the visible spectrum (visible = 400nm to 700nm; infrared = 700nm to 1,000,000nm) and has substantially different properties depending on which part of the infrared spectrum you are at. The infrared spectrum is typically divided into four groups:

l  Near-infrared (wavelengths of 700 nm to 1400 nm): Produced by objects that are glowing hot (light bulbs, the sun, fires). Most "night vision" cameras use this because the sensors are cheap (just stick a visible-light-blocking filter over a digital camera sensor) and because you can illuminate an area with IR-emitting LE Ds without anyone noticing. Most greyscale night images are using this part of the infrared spectrum. Glass is quite transparent to this, as are many lightweight fabrics (most notably, those used in swimsuits). Metal reflects it, and most opaque objects block it. If you assume it behaves like visible light, you usually won't be wrong.

l  Mid-infrared (wavelengths of 1400 nm to 8000 nm): Produced by objects that aren't quite glowing hot (jet engines and the like). Used mostly by heat-seeking missiles.

l  Long-wave or thermal infrared (8000 nm to 15,000 nm): Produced by objects that are at "reasonable" temperatures. This is the band that is used by heat-detecting cameras. These cameras are quite expensive, and need to be cooled down below the temperature of the environment (otherwise, they'd see themselves rather than the world around them). Most solid objects will block or smear the IR from objects behind them, while adding their own heat to the mix.

l  Far infrared (15,000 nm to 1,000,000 nm): Produced by cold objects (think "liquid nitrogen" cold) and by specialized scientific equipment. Not much practical use.

 

Terahertz radiation (T-rays) sit uncomfortably on the border between infrared and microwaves. They're hard to produce and hard to detect, but most non-conductive objects (walls, clothing, etc) are transparent to them while most conductive objects (metal, the water in your body) reflect them. They're mostly a scientific curiosity right now already being used for airport security in a number of countries, and known as "nude scanners".

 

LEXID Sees Through Walls To Next Apartment

http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=1369

The handheld LEXID 'Lobster Eye' X-ray Inspection Device allows the user to see through walls to hidden spaces beyond. The device is particularly well-suited to finding and examining the secret compartments and passages in your castle or other dwelling place.


(LEXID handheld sees through walls)

The LEXID device acquires and focuses backscattering photons from hidden objects that are irradiated by the beam coming from the device (a low power x-ray generator). The x-ray optic focusing enhances image resolution without using higher power x-rays (always a plus for people on the other side of the wall!).


(Here's how LEXID works)

Boffins are really getting out the options for looking through walls; see LifeReader Senses The Enemy Through Walls and DARPA Radar Scope Can Sense Thru Walls for details on other options.

I use some other sf devices as predecessors in the other stories; here's an amusing reference from a 1936 John W. Campbell story:

"They had the tube then. They called it the PTW tube - Probability Time Wave. They'd been trying to make a television set that would see through walls..."
(Read more)

This passage just goes to show that even seventy years ago, people were thinking about a device just like this one. Gordon Giles used a similar idea in his 1937 story Diamond Planetoid to see which planetoids where worth mining; take a look at the X-beam projector.

Via LEXID x-ray imaging device.

Scroll down for more stories in the same category. (Story submitted 12/21/2007)

 

Please go to LAST PAGE OF "Replies to this Discussion" to read NEWEST Information

 

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LEXID® - Handheld X-ray Imaging Device
http://www.poc.com/emerging_products/lexid/default.asp
The handheld LEXID® X-ray imaging device provides a quick and safe way for Homeland Security personnel, law enforcement, customs and border agents, and Coast Guard boarding parties to view concealed objects and potential threats behind walls, or hidden in containers or vehicles. LEXID® is a single sided X-ray detection and imaging system that provides through-the-wall acquisition and focusing of Compton backscattered photons of hidden objects, contraband, explosive devices, weapons or people. The hard X-ray optics combined with the X-ray detector significantly lowers the exposure dose, while greatly enhancing image resolution. The real-time operating LEXID® software synchronizes images acquired, then processes and displays them on the liquid crystal display. POC can currently demonstrate images through a car door with 4mm resolution. Future systems will have improved resolution, X-ray source and X-ray imaging.
Bizarre phone lets users see through walls
Multiple sensors give us perhaps the world's oddest phone
By J Mark LytleOctober 1st 2008 |
http://www.techradar.com/news/phone-and-communications/mobile-phone...

This week's CEATEC technology show just outside Tokyo is home to not just the latest mainstream gadgets, but also some of the weirdest tech you'll ever come across.

In the latter category we have a mobile phone application that is supposed to let users see through walls.

Sensors galore

The 'Real Space See-through Mobile' software comes from KDDI's R&D laboratory and Tokyo University and is – you'll not be surprised to learn – still just a prototype.

Although we weren't able to see it in action, we can tell you that it is supposed to be able to judge its surroundings, including those on the other side of a wall, using six different sensors.

Graphical render

Three acceleration sensors combine with a similar number of geomagnetic sensors and a GPS chip to work out exactly where the phone is and in what direction it's pointing.

Using some sort of digital voodoo, the software then uses OpenGL to draw on the screen what it has 'sensed' is in the immediate surroundings.

Calorie counter

Better yet (we think), it also has the ability to work out whether the user is walking, running or in a vehicle and calculate calories burned in doing so.

We're told it even uses the phone's microphone to work that one out, although quite why the engineers bothered, we're still pretty much clueless.
Wireless Network Signals Produce See-Through Walls
By Kim Zetter October 2, 2009 | 1:35 pm
http://www.wired.com/threatlevel/2009/10/see-through-walls/
Researchers at the University of Utah have found a way to see through walls to detect movement inside a building.

The surveillance technique is called variance-based radio tomographic imaging and works by visualizing variations in radio waves as they travel to nodes in a wireless network. A person moving inside a building will cause the waves to vary in that location, the researchers found, allowing an observer to map their position.

The researchers, electrical engineering graduate student Joey Wilson and his faculty advisor Neil Patwari, have tested the technique with a 34-node wireless network using the IEEE 802.15.4 wireless protocol, according to the MIT Technology Review. By “interrogating” the space with signals and multiple receivers, the researchers found they were able to read the waves to detect the location of a moving object within a meter of accuracy.

The technique could be used by SWAT teams trying to determine the location of a sniper or hostages in a building or by first responders looking for signs of life in a building that is too dangerous to enter.

The responders could conceivably launch a series of radio sensors in the direction of a building, deploying them on each side and even on the roof, the researchers say. Once the nodes begin to transmit, the responders could measure the received signals as they’re transmitted to a base station.

Of course there are privacy and security concerns associated with the technology. A burglar could use it to detect if anyone is home or to scout the location of security guards.
See-Through-Wall Imaging Using Ultra Wideband Short-Pulse Radar System
Yunqiang Yang, Aly E. Fathy
The ECE Department, University of Tennessee
Knoxville, TN 37996
http://www.uta.edu/rfmems/Telemetry/UWB/UWB_propagation/through_wal...
Abstract: See-Through-Wall imaging radar is a unique application of Ultra Wideband communication that can provide soldiers and law enforcement officers an enhanced situation awareness. We have developed an Ultra-wideband high-resolution short pulse imaging radar system operating around 10 GHz, where two essential considerations were addressed, the effect of penetrating the walls, and the pulse fidelity through the UWB
components and antennas of the radar. Modeled and measured wall parameters, and the effect of antenna types on signal fidelity will be discussed here in details.

Background
Ultra Wideband technology has been the subject of extensive research in recent years due to its potential applications and unique capabilities. Meanwhile, there is a lot of interest and attention on See-Through-Wall application because of current homeland security issues, where extensive work has been performed in the field of short-pulse radar [1, 2].
As the primary advantages ofUWB for short-range radar imaging include extremely fine range resolution (theoretically sub-centimeter resolution), high power efficiency (because of low transmit duty cycle), low probability of detection, low interference to legacy systems, and its ability to detect moving or stationary targets [3].
We have developed a radar prototype, which utilizes an instantaneous 3dB bandwidth of 600 MHz and a center frequency of 10 GHz. In this paper, however, we emphasize two essential and special design considerations of the system. First, the electromagnetic wave propagation through walls made of typical building materials, and the pulse fidelity. Walls were examined both theoretically and experimentally and pulse fidelity was investigated in time domain.

Evaluation of Wall Materials
See-Through-Wall radar requires the ability to detect targets through materials such as concrete, bricks, dry wall, and plywood. Relatively high-density materials like concrete and bricks can result in considerable attenuation of electromagnetic waves, increasing requirements for both radar power and signal processing. Fig. 1 shows the RF attenuation in different types of walls as measured by our team in comparison to Currie, et al [4]. The lines show that most walls, such as dry wall, plywood, and bricks are fairly transparent to radar frequencies, thus making through-the-wall imaging possible. If radar signal must penetrate concrete block, a practical operational frequency is about 3 GHz, and the usable frequency range is no greater than approximately 10 GHz, as is one of the reasons the system operates at 10 GHz center frequency. The other reason is that, despite the fact that attenuation through materials is greater, the antennas and components are smaller than at lower frequency, resulting in a more compact system.

We also measured the insertion transfer function through wall slabs. Fig.2 shows the experimental configuration, where the transmit and receive antennas are positioned on line of sight, and transmission coefficients were measured with and without the presence of wall slabs between antennas, using 85 IOC Vector Network Analyzer. The insertion transfer function is defined as the ratio of such two transmission coefficients. An Advanced Design System (ADS) model was developed to simulate this experiment, shown in Fig.3. In the ADS model, wall slabs and free space paths were represented by transmission-lines. The parameters of transmission line, such as dielectric constant and loss tangent are adjusted according to the wall materials, i.e. when simulation matches measurement. Fig.4 plots the insertion transfer functions versus frequency for drywall slabs with different thickness, where we can see that the measured results match the simulation very well. The simple ADS model will help us to take the wall effect into account.

See-Thru-Wall Radar Prototype

The UWB radar system consists of four basic blocks: antennas, transceiver, data acquisition, and imaging post processing, where the radar sends out UWB short pulse signal, and receives echo retumed from targets. I/Q channel information are extracted from echo signal, then digitized and saved for image processing. Computers are used for user interface, and application programs for imaging processing.

The developed system utilizes a 1-18 GHz UWB double-ridge hom antenna for transmission, and a 16-element antipodal Vivaldi [5] sub-array for reception, the system is shown in Fig. 5. While, the developed antenna is part of a 16x16 synthetic-aperture receive antenna. The radar operates at a center frequency of 10 GHz and has an
instantaneous 10dB bandwidth of 1 GHz. Off-the-shelf UWB equipments and components were purchased for the experimental investigation.

Pulse Fidelity through Radar System
The image of the target behind walls is recovered based on the efficient transmission and reception of pulse signal. The distortion of pulse signal will translate into the distortion of images of targets. Therefore it is necessary to understand how pulse distortion is generated and how the pulse fidelity can be preserved in our system.

There are several factors, which could possibly cause pulse distortion, changing timedomain pulse shape in other words. The first cause could be due to the imperfect UWB performance of off-the shelf components. The second cause can occur due to the transmit and receive antennas, since the intensity of radiated/received electromagnetic field varies proportionally with the derivative of the antenna current in transmit, and the integral of
the current in reception.

Experimental measurements were carried out to investigate the pulse distortion through components and antennas. The output of the pulser is up-converted to 10GHz through a mixer, and then connected to an UWB antenna through an UWB amplifier. Receive and transmit antennas are positioned for line-of-sight free-space transmission. On the
receiving end, instead of I/Q demodulation, we just simply down-converted the modulated pulse signal. The pulser output and recovered down-converted pulse are both hooked up to a Tektronix sampling oscilloscope and compared. Different transmit/receive antenna pair were used, and the effect of antenna on pulse distortion was examined. Fig.

6 shows the shape of recovered pulse, compared to the original one, after transmitting through components and antennas. The comparison indicates that the pulse fidelity is best preserved when using two identical UWB antennas for transmission and reception. Use of different antennas can cause slight distortion, unless both have very wide bands.

Conclusion
An ultra wideband short-range radar has been developed and is based on SAR principles.
The developed radar was used to evaluate various wall materials, and study pulse signal fidelity through the system. It was concluded that at 3 GHz, brick walls can be penetrated, and systems can be operable up to 10 GHz, other wall materials would allow operation to much higher frequencies. Our system even though it utilizes Vivaldi antenna
for reception and UWB hom antenna for transmission does not distort the signal quality.

Acknowledgements
The authors would like to thank Dr. Mongi A. Abidi of University of Tennessee, Knoxville for his support in this work.
Reference:
[I] J. Taylor, Ed. Introduction to Ultra-wideband Radar Systems. Boca Raton, FL: CRC, 1995.
[2] Ultra-Wideband, Short-Pulse Electromagnetics 1, 2, 3 and 4, New York: Plenum, 1993, 1994, 1997, and 1999
[3] 1.1. Immoreeve and D.V. Fedotov, "Ultra wideband radar systems: Advantages and disadvantages", in Proc. IEEE Ultra Wideband Systems and Technologies Conf, Baltimore, MD, May 2002, pp.201-205.
[4] N.C. Currie, D.D. Ferris, and al, "New law enforcement application of millimeter wave radar", SPIE Vol. 3066, pp2-10, 1997
[5] E.Ehud Gazit, "Improved design of the Vivaldi antenna," Proc. Inst. Elect. Eng., pt. H, vol. 135, no. 2, pp. 89-92, Apr. 1988.


More details: http://www.uta.edu/rfmems/Telemetry/UWB/UWB_propagation/through_wal...
What is HARMONIC RADAR?
Harmonic radar is a technique that has been used for tracking very small animals such as bees and butterflies. A simple procedure requires that a very lightweight and simple tag consisting of a Schottky diode and a particular length of wire be placed on the specific target, in this case, the small animal. The vicinity is then blasted with a standard directional radar pulse. While this occurs, the tag picks up the signal passively and reradiates it at a harmonic frequency (typically doubled that of the original signal). This harmonic frequency can be picked up without confusing it with the radar backscatter by other objects in the surroundings.
http://www.mindef.gov.sg/imindef/mindef_websites/topics/dtp/dtp2007...
New Systems for Urban Surveillance (FOI,Sweden)
http://www2.foi.se/rapp/foir1668.pdf
Through-the-Wall Surveillance Technology - Part 1
by badexperiment | August 5, 2009 at 01:26 pm
http://www.nowpublic.com/tech-biz/through-wall-surveillance-technol...
“All truths are easy to understand once they are discovered; the point is to discover them.“ - Galileo Galilei

How do you feel about your right to privacy? Suppose your neighbor possessed technology capable of remotely recording detailed images of you in your home, through your walls, through your clothing? What if that technology could be used indiscriminately, without the control of laws or search warrants?

That is now possible! Surveillance tools are currently being manufactured that have the following characteristics:

■The ability to see through walls, and most common construction materials. The ability to generate detailed through-the-clothing images of individuals in the room or home under surveillance.
■The units can be operated remotely from a nearby home or apartment.
■The units can track movement, and monitor speech, heartbeat, pulse, and other bodily functions remotely.
■The units can provide precise distance measurements for targeting individuals under surveillance with weapons.
■The units are portable, silent, and can be disguised or hidden in a typical residential home or apartment.
Surveillance technology with these capabilities have been commercially available for the past ten years. However, it has only been in the last five years that details regarding it have become widely available. Why? Because the companies who manufactured this technology previously for covert purposes have rushed to remarket it for the lucrative new anti-terrorism / homeland security market that occurred after the 9/11 terrorist attack. However, these surveillance tools have been quietly marketed to law enforcement agencies since their development.

You may already be familiar with this technology, and not be aware of it. When your luggage is inspected at an airport, it may be scanned by security devices that “see” through your belongings to detect the shape of a gun, knife, or other weapon. That device may use Millimeter Wave technology. Millimeter Waves (see box below) are a form of non-ionizing radiation that can be used to create a see-through image not only of luggage, but also of a fully clothed human. In fact, the image it creates, in effect, strips you of all clothing.


Millimeter Wave X-Ray Image of a tractor trailer truck carrying auto parts. Courtesy AS&E

In the November, 2003 issue of National Geographic Magazine, a special series of articles on surveillance entitled “Watching You” commented on the “x-ray” imaging ability of millimeter wave (or backscatter x-ray) devices by stating that “privacy concerns have sent the creators back to the drawing board in search of a way to blur bodily details.” Interestingly, the author coined the phrase “Virtual Strip Search” to describe this technology. The New York Times Magazine of Jan, 4, 2004 in an essay entitled “Naked Terror” had more to say regarding millimeter wave “x-ray” technology. The author, Jeffrey Rosen coined the phrase “Naked Machine” to describe these devices. He writes: “A kind of electronic strip search, the Naked Machine bounces a low-energy X-ray beam off the human body. In addition to exposing any metal, ceramic or plastic objects that are concealed by clothing, the Naked Machine also produces an anatomically correct naked image of everyone it scrutinizes.”

The ability of this technology to render highly detailed through-the-clothing images of the body is also commented on by a leading developer of the technology, Pacific Northwest Laboratories (PNL), a division of the United States Department of Energy. “With the system’s success came questions about its potential to display the unclothed physical features of a person being scanned to the operator running the machine. Since 1997, PNL scientists have been addressing this potential privacy issue by reprogramming the system to give the operator a view of only concealed items, and not the person’s image.” - Department of Research Energy News. Clearly, Millimeter Wave Imaging (see article What Are Millimeter Waves) provides highly detailed, through-the-clothing images that can be useful in covert, remote surveillance. However, can this technology be used to see through the walls of homes and apartments? If so, is there any evidence to show that it is being used for that purpose by law enforcement agencies? And, more importantly, what weapons are used in conjunction with these surveillance tools? We will consider that in our next installment.
No Place to Hide
Portable radar devices see through walls and report what's inside
By Willie D. Jones / November 2005
http://spectrum.ieee.org/biomedical/devices/no-place-to-hide
It's one of the classic movie plots: the bad guys--foiled in their attempt to grab piles of cash or some priceless artifact and make a speedy getaway--have taken hostages. The police hatch a plan to covertly enter the building and capture the criminals, and the hero almost always chooses just the right air duct that will let him spy on the captors before he springs into action. But in real life, where such heroic gambits are often deemed too risky, researchers have been working on radar that can "see" through walls, so police can know where hostages are congregated or soldiers can tell where the enemy is lying in wait. Two devices that meet demanding criteria are on the market, and one has been adapted for use by the U.S. military in Iraq.

Some conventional radar can penetrate walls, but it cannot distinguish objects just ahead, it emits far too much power to be safe for operators, and it requires equipment about the size of a lab bench. Advances in digital signal processors and microwave integrated circuits have made it possible to fit a complete microwave system in a box the size of two encyclopedia volumes. Now, through-the-wall radar devices that are lightweight, portable, and able to focus up to 20 or 30 meters ahead are available to municipalities and law enforcement agencies. Two such devices are RadarVision, built by Time Domain Corp., of Huntsville, Ala., and the Prism 100, from Cambridge Consultants Ltd., in Cambridge, England. Both rely on ultrawideband, a fairly new technology known mainly as a promising high-speed, low-power radio communications transmission technique.

A change in software can turn an ultrawideband radio into a wall-penetrating and imaging radar
A change in software can turn an ultrawideband radio, whose pulses of RF energy normally carry data, into an ultrawideband radar. Though these new portable radars are based on each firm's own flavor of ultrawideband technology, they are quite similar. Both devices can detect the presence of inanimate objects through the wall, but only motion (in the form of a moving blob of color on their built-in color screens) is shown to the user. The devices are so sensitive that even if someone on the other side of the wall is sitting still, the machines can detect the rise and fall of the person's chest with each breath.

The radars transmit millions of very short pulses. What they see through a wall is related to the timing of the return pulses. RadarVision generates 10 million 300- to 500-picosecond-long pulses every second--each one at well below 100 microwatts. Its receiver knows to within a few picoseconds when any one of the pulses will return and will switch on only for a brief sampling window, after which it shuts off again. This feature greatly improves the signal-to-noise ratio of the return signal and reduces the radar's power consumption.

Either device can run for a couple of hours on a single battery charge. Each also has the added benefit of making it difficult for the bad guys to know they are being monitored, because signal detection devices can't distinguish the devices' low-power transmissions from background noise.

On return, the pulses are picked up by a linear array of antennas. The time of arrival for each return pulse is measured at each antenna, providing an accurate determination of where the moving object is with respect to the machine's field of view. The radar systems look for changes in the range and angle at which successive pulses strike an object on the other side of the wall.

If, say, Pulse 1 comes back revealing that there is an object at range x and angle y, a difference in range or angle for Pulse 2 is registered as movement. An onscreen representation of that is shown to the user. Whenever there is no difference between the latest pulse return and the one preceding it, which is the case for pulses that bounce off inanimate objects, the system disregards those objects and omits them from the display.

What the user sees is a plain view of what lies on the other side of the wall, but seen onscreen from above [see illustration, " Looking Over"]. An optional mode shows the space on the other side of the wall the way it would appear from the side. This option allows an experienced operator to distinguish between tall and short objects, such as an adult and a small child or pet.

To get around spectrum interference rules and to make the radar even more immune to detection, the pulses, which are spread across frequencies ranging from 1 to 5 gigahertz, are pseudorandomly dithered in time. Dithering requires a time code that determines the position of the pulse within a time window. This ensures that the signal is like noise: it is evenly distributed in the frequency domain and thus presents only a tiny amount of energy in any frequency band.

For Soldier Vision, a version of RadarVision commissioned by the U.S. Army for overseas deployment, there is a boost mode that ups the transmit power of the pulses, making movement easier to detect. Prism 200, scheduled for release in early 2006, operates at higher power as well.

Meanwhile, other devices said to be better suited to scanning disaster sites are being put through their paces. These include Radar Flashlight, developed at the Georgia Institute of Technology, in Atlanta, which relies on Doppler shifts in return pulses to detect motion.
Infrared Xray Camera
http://tvtropes.org/pmwiki/pmwiki.php/Main/InfraredXrayCamera
"I see you, a thief on the roof. My new satellite link has both infrared and the x-ray spectrum. I see your heart beating. I see you are afraid."
- Gunther Hermann, Deus Ex

Whenever someone calls for the infrared camera on TV shows and film these days, either the handheld version or one mounted on Spy Satellites, the device will have amazing qualities, chief among them being able to see through walls. It's incredibly convenient for the good guys being able to make out what's happening inside the building. Sadly, real infrared cameras don't work like that at all. Heat simply doesn't go through walls in such a way to form a picture. Walls are generally supposed to stop heat from getting through them, which is why they are insulated. In fact an infrared camera cannot even see through a sheet of regular glass that's perfectly clear to anyone using the Mark One Eyeball. Anyone looking at a sheet of glass with infrared is more likely to see their own reflection. Steam is not good for IR either, but any light fog (which is usually cool) could be penetrable to an extent.

The truth is plainly obvious from all those televised high-speed chases in Los Angeles where, to pump up the ratings during sweeps, the chase takes place at night so the Forward Looking Infrared camera on the police helicopter gets to show the Cool High Tech imagery. You can see the heat of the car engine, the tires, the ground where something hot has been, even the reflection of heat off the ground, yet you can't see the driver and his passengers although the few millimeters of metal making up the car body is a lot thinner than the several inches of material making up the average house wall. Not to mention, it conducts heat better. One can therefore conclude that either writers and directors don't watch Fox, or that it's yet another case of technology gone awry in the service of the plot.

The infrared spectrum is over three thousand times wider than the visible spectrum (visible = 400nm to 700nm; infrared = 700nm to 1,000,000nm) and has substantially different properties depending on which part of the infrared spectrum you are at. The infrared spectrum is typically divided into four groups:

•Near-infrared (wavelengths of 700 nm to 1400 nm): Produced by objects that are glowing hot (light bulbs, the sun, fires). Most "night vision" cameras use this because the sensors are cheap (just stick a visible-light-blocking filter over a digital camera sensor) and because you can illuminate an area with IR-emitting LE Ds without anyone noticing. Most greyscale night images are using this part of the infrared spectrum. Glass is quite transparent to this, as are many lightweight fabrics (most notably, those used in swimsuits). Metal reflects it, and most opaque objects block it. If you assume it behaves like visible light, you usually won't be wrong.
•Mid-infrared (wavelengths of 1400 nm to 8000 nm): Produced by objects that aren't quite glowing hot (jet engines and the like). Used mostly by heat-seeking missiles.
•Long-wave or thermal infrared (8000 nm to 15,000 nm): Produced by objects that are at "reasonable" temperatures. This is the band that is used by heat-detecting cameras. These cameras are quite expensive, and need to be cooled down below the temperature of the environment (otherwise, they'd see themselves rather than the world around them). Most solid objects will block or smear the IR from objects behind them, while adding their own heat to the mix.
•Far infrared (15,000 nm to 1,000,000 nm): Produced by cold objects (think "liquid nitrogen" cold) and by specialized scientific equipment. Not much practical use.

Terahertz radiation (T-rays) sit uncomfortably on the border between infrared and microwaves. They're hard to produce and hard to detect, but most non-conductive objects (walls, clothing, etc) are transparent to them while most conductive objects (metal, the water in your body) reflect them. They're mostly a scientific curiosity right now already being used for airport security in a number of countries, and known as "nude scanners".
Knight Rider: Seeing Through Walls With Infrared Glasses?
http://blogs.discovermagazine.com/sciencenotfiction/2009/01/29/knig...
Will someone please explain how this whole infrared-can-see-through-walls thing got started? It comes up everywhere: James Bond used it, One of the iterations of CSI used it, then KITT used it on last night’s episode of the New and Improved Knight Rider (now with more humor!). Not that I particularly blame Knight Rider, because it’s such a common meme. So, for the record, infrared cameras cannot see through walls. These cameras, like night vision goggles, pick up lower wavelength electromagnetic signals that we sense as heat. But the insulated walls of buildings are designed to block heat from escaping, essentially forming a…well, a wall between the camera and person in the building. Luckily, there are many excellent real ways for KITT to see through walls.

The Lobster-Eye X-Ray Device (LEXID) uses X-rays (like Superman!) to see through walls. The LEXID looks like a flashlight, but it uses X-ray emissions to see through up to three inches of steel. It’s actually pretty neat, the designers modelled it on the vision system used by lobsters and other crustaceans. Where the human eye uses a lens to refract light onto the optic nerve, a lobster uses a series of tiny biological “mirrors” to project disparate light beams onto a single focal point. The LEXID collects X-rays in the same way.

Or how about a little mini-radar type system? The Xaver 800 can see into a room, map it onto a screen, and maintain real-time, three dimensional updates on the locations of people within the room. The system relies on Ultra Wide Bandwidth signals, a method that relies on timing and and a large selection of radio wavelengths, rather than sheer power (Traditional uses of radiowaves use a narrower part of the spectrum but are higher power). The system can see through concrete, reinforced concrete, wood, brick, and pretty much anything except a continuous sheet of metal.

So there’s plenty of ways for futuristic soliders and talking cars to see through walls. I just wish I could figure out how we got to thinking that infrared was one of them.
http://www.camero-tech.com/faq.shtml
Xaver™ 800 - FAQ
1. Can the XaverT 800 really see through walls?
The Xaver™ 800 is microwave radar that is capable of penetrating walls and creating an image of objects behind those walls by picking up the reflected energy from those objects (including people and canine). The system provides information regarding the number of people, their location and orientation, as well as the shape of the room. Since the resulted images are not created by visible light or infrared optical methods, they are less detailed.


2. Why was the Xaver™ 800 developed?
The ability to see through solid, non-transparent walls is a capability that everyone can immediately find applications for. For people who operate in hostile environments this ability can be the difference between success and failure of an operation. Failure may spell out casualties. The need for this technology has existed for a long time and now the Xaver™ 800 is mature to deliver this capability in a compact, portable device.

The Xaver™ 800 system creates an operational unfair advantage to the one who operates it. It pretty much changes the rules of the game, allowing a real shift in operational paradigms. Forces can plan ahead and beyond the wall they stand in front of, significantly increasing their mission success probability while protecting their lives.


3. How does the Xaver™ 800 work?
The system is basically a radar, but with several unique characteristics. First and foremost, the operational environment is very different than ordinary radars, e.g. for air traffic control. Ordinary radar operates in free space over large distances and transmits very high power levels. Our system needs to penetrate walls and provide high resolution in relatively short distances. In addition, due to the fact that there are people in the immediate vicinity of the system we must keep microwave radiation at safe levels. Our design utilizes special antenna design and an ultra wideband (UWB) signal to cope with the challenge. The use of UWB signal provides design simplicity on one hand, but required innovative implementation on the other. We overcame all hurdles implementing creative concepts, many of these are patented or patent pending.


4. What types and thickness of walls can the XaverT 800 see through?
The Xaver™ 800 can see through most commonly used wall materials, e.g. clay brick, cinder blocks, rebar reinforced concrete, plaster dry wall, wood, adobe, stone and glass. The system can not penetrate a continuous sheet of metal. The penetrateable wall thickness varies and depends on the wall material. The system has several modes of operation and view options to cope with “tough” walls.


5. Can the radar "see" the shape of a room? E.g. where the doors and dividing walls are placed? Can the XaverT 800 produce images of activities on upper floors?
The system can map the shape of a room as well as other solid structures such as a desk or file cabinet. Xaver™ 800 can produce images through floors and ceilings as well.


6. How does the XaverT 800 assist the personnel using it? What are the applications?
The system provides situational awareness of a room or building by providing information of how many people are behind the wall or walls; it also provides information on the structure of the building or rooms. Getting information from behind solid walls allows better preparation of an operation: reducing surprises, efficient use of resources and eventually saving lives.
Applications include:

■Military urban operations
■Hostage rescue
■Victim search and rescue

7. What's new and unique about the system in terms of the capabilities?
The new and unique capabilities in the Xaver™ 800 system include high resolution, real-time 3-D imaging, the ability to discriminate how many people are in a room or building, where they are, what they are doing, and the ability to combine this information with structural information of the room or building. The system is also capable of differentiating between static and moving objects. This is a powerful capability, providing information about where the objects are relative to the structure, e.g. on which side of an inner wall a person is located.


8. This is Radar. Is it safe for its operators and people behind the wall?
Absolutely yes. The Xaver™ 800 transmits microwave energy at power level that is a tiny fraction of the power levels of a cellular phone.


9. How big is the system? How many people are needed to carry and operate it?
The Xaver™ 800 is a portable system. It weighs 15Kg/33lb and it folds to a compact 47cmX47cmX15cm ( 19” x 19” x 6”) that can be easily carried and operated by a single person. The system consists of two parts – Front end (FE), which is the sensor part and Back end (BE), which is the operating and display unit. The two parts may be either attached to each other or connected by cable.


10. How much time does it take for set up? Does the operator need to stay near the system to operate it?
Unfolding the sensor and mounting the system on a tripod takes less than one minute. The Xaver™ 800 delivers images within 15 seconds from pressing the ON/OFF button.

The operator may stay near the system or connect the FE and BE through a cable that is up to 30m/100ft long, thus staying away from the sensor and the wall.


11. Is it necessary to place the system close to the wall?
No. The system’s range is 8m/26ft and the wall can be anywhere within this range. Yet, placing the system close to the wall has many advantages, minimizing any effects that can be created by reflections from the wall’s external surface.

12. What sets the Xaver™ 800 apart from competitors?
Several concepts used in the system’s design translate into superior performance and unprecedented image details. The image is detailed enough to tell what the person is doing, e.g. standing, waking, sitting, kneeling etc. The use of ultra wideband signal translates into high radial resolution. Special sensor design increases angular resolution. These, together with advanced image reconstruction algorithms, provide better handling of clutter and the ability to show high resolution 3D image of a person.

13. When did the Xaver™ 800 go into production? Who is currently using the Xaver™ 800?
Low rate production began earlier this year (2007). The Xaver™ 800 is in use and under evaluation by the military of several countries and law enforcement agencies.

ultra wideband (UWB) signal

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