Description Usage Arguments Details Note Author(s) References See Also Examples
A simple star test simulator, with optional MTF or wavefront plot.
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zcoef |
Vector of Zernike coefficients |
zlist |
A list with named components |
obstruct |
central obstruction fraction |
lambda |
Wavelength. Defaults to 1 for a wavefront in waves. |
defocus |
Amount of defocus for side panes, in waves P-V. |
pupilsize |
Size of matrix representing pupil |
npad |
Size of the 0 padded matrix for fft calculations |
gamma |
gamma value for image display |
psfmag |
Magnification factor for in focus PSF display |
displaymtf |
Boolean: display MTF? |
displaywf |
Boolean: display Wavefront? |
fileout |
Boolean: Is the intended output a file? |
Computes the intensity distribution from a monochromatic point source in the approximation of Fraunhofer diffraction theory. See Suiter (1994) for a full discussion of the application of the theory to practical star testing of small telescopes.
The ratio of npad to pupilsize determines the size of the Airy disk in the “in focus” image. The default choices will produce an Airy disk with a diameter of approximately 10 pixels, and the amount of zero padding is sufficient to prevent significant aliasing for defocus values up to about 20 waves.
If memory limitations cause errors satisfactory images can still be obtained with,
say, npad=512
and pupilsize=127
.
M.L. Peck mpeck1@ix.netcom.com
Born, M. and Wolf, E. 1999, Principles of Optics, 7th Edition, Cambridge University Press.
Suiter, H. R., 1994, Star Testing Astronomical Telescopes, Willman-Bell, Inc.
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