foucogram | R Documentation |
Simulates the appearance of a wavefront under the Foucault test.
foucogram(wf, edgex = 0, phradius = 0, slit = FALSE,
pad = 4, gamma = 1, map = FALSE, lev = 0.5)
wf |
An object of class |
edgex |
lateral position of knife edge |
phradius |
radius of light source |
slit |
Logical: Is source a slit or pinhole? |
pad |
pad factor for FFT |
gamma |
Gamma value for graphics display |
map |
Logical: Overlay contours from wavefront map? |
lev |
Increment for contour levels, if used |
The default value of 0 for phradius
simulates a monochromatic point source.
Try values in the range 10-30 to suppress diffraction effects.
A matrix of intensity levels in the simulated image.
The key approximations here are treating the light source as monochromatic and spatially coherent, which is usually not the case for an extended source. Also, Fraunhofer diffraction theory is used.
M.L. Peck mpeck1@ix.netcom.com
See http://home.netcom.com/~mpeck1/astro/foucault/ext_foucault.pdf for an outline of the mathematical treatment of an extended source.
pupil
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