| Subject: RE: RADAR 
      INVISIBILITY - SLIDE 84 - "FER DE LANCE" INDEX  Date: Fri, 19 Apr 2002 16:46:34 -0500 
          
          Tony, 
          
            
          
          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. 
          
            
          
          Best wishes, 
          
            
          
          Tom 
          
            
          
             |