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The IDL routines provided on this page is intended to assist observers
in preparing LGS-AO programs, evaluating AO performance, and
reducing AO science data.
You are invited to download, use, and modify this software to suit your
needs, but it is of course provided with no guarantee of support by the
authors.
Many of the programs use
IDL Astronomy User Library subroutines.
Several also use the function optimization routines of
Craig Markwardt.
All include a header which details the syntax and use of the program.
LGS Observation Planning
July 08: Due to recent changes in the Vizier format, these routines
require the most recent versions of
QUERYVIZIER and
WEBGET.
| FINDTTREF.pro |
Find USNO-B1 or 2MASS tip/tilt stars near a list of LGS targets. |
| FINDLGSPSF.pro |
Find IR-bright PSF stars with similar target/TTref geometry. |
AO performance analysis
| PH_STREHL.pro |
Computes the Strehl of a single PHARO image. Uses PH_PSF.pro. |
| PH_PSF.pro |
Compute a diffraction-limited monochromatic PSF from a PHARO image header. |
PHARO data reduction
| READPHARO.pro |
Read a PHARO NxNx4 or NxNx8 FITS image cube and return the 2-D image. |
| PH_MKDARK.pro |
Process and save PHARO dark frames. |
| PH_MKFLAT.pro |
Process and save PHARO flat and bad pixel frames. |
| PH_REGISTER.pro |
Reduce sets of PHARO images taken either on/off source or using
a dither pattern. Saves individual reduced images and an averaged
stacked image. Best for faint sources (uses 2-stage registration by
cross-correlation on a user-chosen object in the field). |
| PH_DITHER.pro |
Reduce sets of PHARO images taken either in a dither or mosaic pattern.
Saves individual reduced images, mosaic, and mean image. Best for bright
targets (registrers frames by cross-correlation over the overlap regions).
Updated 4/10/09 |
Here is an example using the above routines to reduce one dither
sequence and calibration files:
ddir = 'data/pharo_070425/'
pdir = 'proc/pharo_070425/'
PH_MKDARK, data=ddir, proc=pdir, frno=99+INDGEN(10) ; 19.8s darks
PH_MKFLAT, data=ddir, proc=pdir, frno=49+INDGEN(5) ; Ks flats (19.8s)
PH_DITHER, data=ddir, proc=pdir, obj=696+INDGEN(20) ; M20 Ks mosaic
Subroutines
| READSTARLIST.pro |
Read Keck or Palomar format starlists into a structure array. |
| STARSTRING.pro |
Convert target structure into a Keck-format string. |
| RFITS.pro |
Read multiple FITS images into an image cube (use /PHARO keyword). |
| MEDIM.pro |
Compute the pixel-by-pixel median of a series of images
(use /PHARO keyword). Updated 4/14/09 |
| BPIXFIX.pro |
Replace bad pixels with the median of surrounding good pixels. |
| CRAYFIX.pro |
Find and replace anomalously high pixels. |
| PFFT.pro |
Returns a 2-D FFT, padded with zeros. |
| FSHIFT.pro |
Fourier shift function (sub-pixel shifts with no resolution loss.) |
For more information please contact
abouchez@astro.caltech.edu.
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