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I am writing a program to compute the
vignetting caused by various apertures and central obstructions, and I
don't know a good way to do it. So far, I am using crude hit or miss
monte carlo with eight bins to reduce the variance, but there must be a better
way.
Every other method I have considered requires that
the region to be integrated have no holes. Because of the central
obstruction, I have a hole in the region, and the region is not
convex.
The program runs on a Palm under Hotpaw
basic. It allows for two obstructions (tube rim and diagonal central
obstruction) in the parallel part of the light beam, and two more (diagonal and
focuser rim) in the conical section of the light path. I am working
on a version that will identify the worst offending light
obstructor.
Ultimately, I woudl like to post the program on my
web page. I think there are a lot of Palm users out there, but too
few of them are developing telescope engineering applications.
. . . Richard
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