On 07/20/2012 04:23 AM, Michael Baker wrote:
Time-nutters--
Didier Juges asked:
> What does that do to the focussing properties
> of the dish?
------------------------
I have seen several descriptions of how the dish
needs to be shaped in order to develop the orbital
time-delayed angular momentum signal and still
achieve an integral focus point. I am not sure that
I can describe it, but as I understand it, the dish
is not just split and bent into a cork-screw, but that
the surface of the dish is also continuously shaped so
as to provide a good focus.... It is just that the
signal striking parts of the dish which are increasingly
displaced along the axis of the bore-sight are time
delayed more or less with respect to other surfaces
of the dish. The only way I can see for this to work is
for the dish surface to deviate from a true parabolic
shape incrementally as each particular area is displaced
closer or further away from the focal point. It is a
little hard to visualize and a lot harder to find the
right words to adequately describe!
Rather, for each line of the center, it will have the parabolic shape
for a parabol located at that distance, it's just that this distance
changes with the angle. The vector sum for the twisted wavefront will be
a flat wavefront in the focus, but flat wavefronts will be dispersed
away from the center... as if they where diffused (which they are).
Makes sense now.
Cheers,
Magnus
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