|Subject: RE: RADAR
INVISIBILITY - SLIDE 84 - "FER DE LANCE" INDEX
Date: Fri, 19 Apr 2002 16:46:34 -0500
Basically it takes awhile for a photon to be absorbed, excite an orbital electron in the atom, and then the excited orbital state decay to re-emit the photon. During that time, one has time to do longitudinal EM wave processing to essentially do whatever one wishes with the normal "photon processing" functions of the material (the object). If one is able to process the longitudinal EM waves that internally comprise normal EM waves and potentials (radiation), then there appears to be two things necessary for "invisibility". First, one takes the incoming waves in one direction, and insures that the opposite side of the object emits those waves in that magnitude -- which is the magnitude that would be propagating on the other side of the object if the object were not there. Actually there is already a longitudinal EM wave component of all normal incident radiation that passes through the object without interacting, because only a tad of it is intercepted and diverged. So something is done like sensing the difference between a given total spectral set of longitudinal waves incoming in one direction to the object, and that same spectral set of longitudinal waves going out the other side with somewhat reduced magnitude. The "smart skins" type system merely compares the two, senses the difference between incoming and outgoing sets, adjusts the magnitude of that sampling to equal the missing difference on the other side, and adds that "missing difference" in phase in to the signal complex out the other side. This creates the business of "seeing right through the object". You don't really see through it, but you see the correct transmitted image to precisely match what would have come to your eyes if the object were not there. No DIFFERENCE comes to your eyes, and we see that object as a "DIFFERENCE". No difference, invisibility of the object and the illusion of seeing right through it. You really do see through it a little, then have added the erasure of the difference you would have seen normally.
That's the first part of it.
The second part is to do a similar thing with the reflected signals back off the skin, from active extra signals (as from a radar). Here you wish to do a different function: Take the incoming radar signal exactly as it is, reverse the phase of all signals components and retransmit the exact signal complex but with phase reversed. That's a "signal cancellation" transmission and what it does is "remove" any NET reflected signal back to you from the object. Actually you get back the reflected signal plus its exact cancellation signal. Unless one is really smart and modified his detectors to detect changes in stress potentials, he will not see what has been done, and he will not see the object. To one who is smart and has added stress potential detection, he will still be able to see the object.
Now one does not quite "perfectly" get that cancellation. So one will see a mysterious black outline or some such, because of the slight imperfection in the actual physical implementation system.
The net result is that no reflected signal is returned to you, but exact replicas of the distant normal signals that would have impinged on your eye if the object were not there still reach your eye. Voila! The object "disappears" from view. That can be visually only, radar only, or in a more sophisticated case, both radar and visual.
Certain solid state semiconductors (or special made ones, such as Fogal's chip) can be rigged to "see" the distant light's longitudinal waves passing through an object (that part that did not get intercepted and diverged and absorbed and reflected). With gain adjustment, Fogal's device can "see right through material objects" and he has so demonstrated.
Couple of nations (maybe more) did such things and developed their own semiconductors of similar ilk at least three decades ago.
It also has probably been "folded in" to the field of "smart materials" --- materials which themselves act as giant arrays of semiconductors and electronic circuits. In short, the ultimate integrated circuit. Much of that material appears classified; e.g., Professor Chung's invention of her negative resistor has probably been scarfed up and classified. She is a world-recognized smart materials researcher. Scarfing up the invention would explain why the offer to send a technical package to interested major companies signing nondisclosure and interested in licensing applications was suddenly withdrawn from the University web site, and why the patent has apparently not been openly issued, and why Chung cannot discuss it with me. (She did send me the paper that got openly published, which had been watered down to use the term "apparent negative resistance".). Note that negative resistance could play a very dramatic role in smart skins and smart materials technology in the most critical areas.
Anyway, that's basically it. It's fundamentally a combination of longitudinal EM wave technology, changes in semiconductor technology, and incorporation of such into smart materials and smart skins technology.