Lick Strehl Tool
The Lick Strehl Tool is an IDL program to measure the Strehl of a 3-m AO IRCAL image. The program is based on the Keck Strehl measuring tool written by Marcos van Dam and customized for Lick AO data by Elinor Gates. The program is started by typing lickstrehl at the IDL prompt. It will bring up the GUI shown below.
To use the tool, simply input a data image file name or click on
Browse to select a file (the default directory is the current
IRCAL data directory). Then choose the filter that corresponds to
the data file.
Estimating the background and using Autofind to locate the brightest
object in the image are optional. If you don't use Autofind you will
have to click on the object after pressing the Go! button to
indicate which object you wish to measure.
By default the photometry radius is set to 2.0 arcseconds, but you may change
this to accomodate the conditions under which the data was taken.
The calculated Strehl and FWHM are displayed in the bottom panel of the GUI.
The selected image, with photometry and sky (if estimate background is
on) radii, is displayed in the upper image window. The perfect PSF is
displayed to the lower left, and the measured PSF is displayed to the
lower right.
To exit the GUI, click the Dismiss button.
Elinor Gates Last modified: Thu Mar 1 10:06:12 PST 2007