THORLABS WFS150, Руководство по эксплуатации

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80 WFS150 / WFS150C Manual
© <2007> ... Thorlabs GmbH
4.3.4 Measurement Results
Numerical measurement results are displayed on the left side of the of the main
panel. Be sure that there is no error occurred during capturing the camera image
and its subsequent analysis.
Note: If not ' No instrument errors ' appears in the status window you cannot
relay on the measurement results!
Refer to Measurement Warnings and Errors for a listing of possibly occurring
errors.
Beam Data
Calculated from the centroid and the second moment of the entire camera image,
the beam's center coordinates
Ctr x and Ctr y and beam diameter Dia x and Dia
y in X and Y direction are displayed in mm. In case of a Gaussian beam shape
the second moment coincides with beam width at the standard 1/e
2
a clip level.
Please take into account that this data cannot give an exact measure of the beam
because the lenslet array in front of the camera and wavefront distortions have
changed the intensity distribution between the real beam and the camera image.
Furthermore, high ambient light level and improper set camera's 'Black Level'
(see
Camera Settings ) will distort the beam data results.
Wavefront Data
These wavefront statistics are either displayed in microns or waves, as selected
in the
Wavefront Sensor Setup Panel . Calculated data is either related to the
entire wavefront or to the pupil interior only, according to the settings within
Pupil Definitions Setup panel.
Depending on the actual wavefront switch setting below the wavefront graph
the calculated wavefront statistics refer to the selected wavefront (Measured,
Reconstructed or Difference).
PV is the total Peak-to-Valley value, that is the maximum variance of
the wavefront in the observed area.
RMS is the Root Mean Squared average value and