Recent content by richardbruce

  1. R

    Build a machine that could defy gravity

    they do launch geostationary satellites so a spatial satellite is probably possible as well and would avoid the effect of rotating atmosphere, but cost a lot more. perhaps a balloon with some sort of propulsion to move in exactly the equal and opposite direction to the atmosphere hence not...
  2. R

    Fresnel Diffraction Simulation Troubleshooting

    yes, perhaps it would be better if i tried the convolution form of the equation. The convolution form seems very popular with scientist. I am using this form of the equation for speed (1 FFT Vs. 3 FFT), but it would be nice to see things working to show I'm at least on the right track. The...
  3. R

    Supercomputer Time: Theory & Its Dependencies

    whether modeling, earthquake simulation and nuclear explosion / reactor simulations are the big examples I know of for running on a super computer , but I'm sure there are many more. A super computer is basically just a lot of computers tightly networked together and in fact people occasionally...
  4. R

    Fresnel Diffraction Simulation Troubleshooting

    In that case let me try a little harder. My input to this equation is P(x,y), which in my case is a diagram of the human eye viewed from front to back. This is why I call it the 'pupil function'. For practical implementation reasons I have had to limit the resolution of this diagram to 1 pixel...
  5. R

    Fresnel Diffraction Simulation Troubleshooting

    oops sorry, my scruffy equations PI in this case is pi (3.14...) Equation 3 from this paper is probably easier to read https://domino.mpi-inf.mpg.de/intranet/ag4/ag4publ.nsf/75b430d92c36578ec12567530068622e/c0af37ef8d7c4059c125755c00337fd6/$FILE/TemporalGlare.pdf
  6. R

    Fresnel Diffraction Simulation Troubleshooting

    Hi Everyone, I am having trouble with my Fourier optics. I am trying to simulate Fresnel diffraction using the following form of the equations: Li(xi, yi) = K * magnitude ( FT{ P(xp, yp)E(xp, yp) } p= xi/ld ;q= yi/ld ) ^2 K = 1/(ld)^2 E(xp, yp) = e^(i*(PI/ld)*(xp^2+yp^2)) P is the...
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