Re: ATM Mask-less Foucault

["A. Suykerbuyk" <asuyker@wxs.nl>]

Hi,

I wonder, could a digital camera be used also?
Perhaps with the pin-stick method?

Thanks,
Adrie Suijkerbuijk.

-----Oorspronkelijk bericht-----
Van: James W. Burrows <burrjaw@halcyon.com>
Aan: atm@shore.net <atm@shore.net>
Datum: vrijdag 6 juli 2001 4:54
Onderwerp: ATM Mask-less Foucault


>
>Mike Peck, Dave Rowe, Nils Olof Carlin, and myself have been simulating
>full-mirror Foucault, e.g., place the KE at various longitudinal distances,
>find the matching pixels on both sides of video camera images of the
>mirror.  Half the distance between the pixels is the representative radius
>of the corresponding "zone" (like a wire test).  Diffraction effects are in
>command in this situation <g>.  The following examples are simulated
>perfect parabolas, moving-source, red laser light (632.8 nm) (Courier font
>will line up the columns):
>
>   mirror           zones        RMS       b          Strehl
>500 mm f/4      8       2.3     -1.002  0.997
>200 mm f/5      5       7.1     -0.943  0.971
>
>It's interesting that the first perfect mirror looks slightly
>overcorrected, nearly 3-digit Stehl accuracy; the second looks
>undercorrected and less than 2-digit Strehl.  Hmm, could it be "zone"
>placements?
>
>         -- Jim Burrows  phone 206.244.2933, fax .0294
>         --              mailto:burrjaw@halcyon.com
>         --              http://www.halcyon.com/burrjaw
>         -- Seattle      N47.47233, W122.36620 (WGS84)
>
>