THORLABS WFS150, Руководство по эксплуатации

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83 Operating Instruction
© <2007> ... Thorlabs GmbH
4.3.5
Measurement Warnings and Errors
During capturing of the camera image and its subsequent analysis some errors
may arise which needs to be recognized.
Note: Measurement results are unreliable if an error or warning is indicated within
the status window.
Read the error message carefully and find a way to remove the reason of it.
Error List
Zernike Fit failed! Insufficient spots detected.
This error occurs if the number of detected spots within the pupil is lower than the
number of Zernike modes to be calculated in the least square Zernike fit.
To prevent this error
· check the analyzed beam that it is properly aligned and its intensity dominates
the ambient light level and/or
· increase the pupil diameter within the Pupil Definitions Setup panel and/or
· reduce the number of Zernike orders in the Zernike Fit Setup panel
Power too low!
The detected spot intensity is too low so that the analysis of its centroid positions
becomes incorrect. Check if 'Exposure Time' and 'Gain' settings within the
Camera Settings Setup of the camera are fixed to a manual entered level.
Change the manual setting or enable automatic control of these camera
parameters.
When this error occurs also for the highest 'Exposure Time' and 'Gain' setting or if
'auto' is already enabled, the light intensity of the beam to be analyzed is too low
for the Wavefront Sensor. Increase the power of your light source or reduce
attenuation in front of the Wavefront Sensor.
Power too high, sensor is saturated!
The detected spot intensity is too high so that the camera image is saturated and
the analysis of the spot centroid positions becomes incorrect.
Check if 'Exposure Time' and 'Gain' settings within the
Camera Settings Setup
panel of the camera are fixed to a manual entered level. Change the manual