© 2007-2012 Thorlabs GmbH
76 WFS Series
Therefore, it is highly recommended to enable option 'Adapt Centroids':
Here, the software checks if the spot centroid positions measured in Normal Mode
are suited to define a grid of calculation windows which is suited to capture all
spots. The grid is flexible with respect to window size and offset position in both x
and y direction.
This flexibility allows adaption of tilted and spherical wavefronts of moderate
amplitude.
In case the above error message occurs the input wavefront is excessively deformed
so that it cannot be measured in Highspeed Mode.
As soon as Highspeed Mode was entered it is displayed within the status window.
Because the camera saturation remains unknown in Highspeed Mode if the auto
exposure option is disabled the camera image may suffer from over- or under
exposure which is leading to wavefront mismeasurement. As a consequence,
Highspeed Mode with disabled auto exposure feature is only applicable when
working at a quite constant power level.
But, a measurement error due to violation of the spot windows by the detected
centroids can be displayed.
NOTE
If this warning occurs, the wavefront measurement is most likely disturbed by spots
which are truncated by its detection window.
4.2.3.2
Pupil Definitions Setup
'Pupil Definitions' handle adjustments concerning the pupil which is the image area
which is used for wavefront calculations and Zernike fit definitions.
To open the setup panel you can use the Menu Setup Wavefront Sensor
entry or simply click right on one of the graphs on the right hand side of the main
panel. Select the tab 'Pupil Definitions'.
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