time reversal wave

DRA ( orbital@rf.net )
Fri, 07 Jan 2000 10:02:21 -0800

In the premier issue of Poptronix (P.E. + E.N.), There is an
interesting article claiming that a wave reflected off a phase
conjugated mirror (PCM) effictivly generates a time reversal wave...
now, how can a mirror vibrating, in phase, at 2x the source wave
reverse time? does that imply that shifting the phase and/or frequincy
could cause a time advancement wave? or better yet, a time stopping
wave?

It seems to me that time is ultimately a constant, and any precived
shift is due to a change in the surounding frequencies. i.e. an
airplane traveling faster than ... is being bombarded with
particles/waves that, and due to the dopler (sp?) effect, causes an
increase in the molecular resonance of the airplane and its contents;
including say.. a cesium clock tht would appear to have advanced in time
compared to one that was on the ground.

can anyone recomend a detector circut capible of generating a phase
locked loop with the earth's 7.xHz or 11.xHz resonance that i could send
through a frequincy doubler, amplify it, and finally pass it through a
PCM type transducer? I guess the hard part would be impedance matching
the system.

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