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aoinf(infile, outfile, nxopd, dxopd)
Usage: aoinf(infile, outfile, nxopd, dxopd)
Description: aoinf calls the external program AOInf in order to compute
the deformable mirror OPD and slope influence functions.
infile: is the name of input file from which the AO geometry
specifications are to be read. Usually, but not necessarily,
this file is created by AOGeom. The filename specification must
include the .mat suffix.
outfilespec: is the name of file to which the resulting combined
reconstructors and AO geometry are to be written. This file is
then loaded into Matlab for computation of the reconstructor
using AORecon or specified as a constructor argument to AOModel.
The filename specification must include the .mat suffix.
nxopd: Specifies the number of points across the square grid
superimposed on the DM for the purpose of resolving surface
deflections on the OPD mesh. This number does not need to be as
large as the propagation grid because the OPD influence function
needs only to provide enough points to cover the entire mirror.
The OPD mesh that is used is one at which the origin lies precisely
at nxopd/2 + 1 point. Hence, the mesh is not symmetric and one must
be careful to use nxopd and dxopd combination which covers the entire
physical region of interest.
dxopd: Specifies the physical spacing between grid points of the square
grid superimposed on the DM for the purpose of resolving surface
deflections on the OPD mesh. This parameter needs to be small enough
to properly model the shape of the mirror and must to be smaller than
the spacing between actuators. It is usually sufficient to use six to
twelve points per actuator spacing. Also, the actuator spacing must
be an even multiple of dxopd.
None. A series of messages are printed which indicate the success or
lack thereof in computing the influence functions and writing the file.
The two main reasons that AOInf may not complete successfully is because
the user has specified a dxopd which does go into the actuator spacing
an integral number of times. Or the nxopd, dxopd combination does not
entirely cover the grid of actuators to be covered. The best way to avoid
these problems is to specify dxopd as an integer divisor of the actuator
spacing (i.e., dxopd = dxact/n, where n is an integer). And use the
command opdc to generator opd coordinates and plot up with xact, yact,
xsub, and ysub which appear in the AOGeom output files.
Produced by mat2html on Thu Feb 8 19:12:42 2001
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