THORLABS WFS20-14AR, Руководство по эксплуатации, Страница: 53 / 153

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5 Operating Instruction
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5.2.4 Graphical Display Panels
The graphical display can be selected either from the menu File -> Display or by clicking to the
appropriate tab below the graph area:
5.2.4.1 Lineview Panel
In this graph, the horizontal intensity distribution of the CMOS camera is displayed. Each point
on the horizontal axis of the diagram corresponds to one column of the CMOS array and dis-
plays both the minimum (gray, at the bottom) and the maximum intensity level (white) of the en-
tire pixel column. The peaks are due to the focusing ability of the lenslet array that concentrates
the intensity within small spots.
This graph is useful for checking the power level of the analyzed beam, particularly with the
auto exposure control disabled. Improper manual settings of the camera will lead to low or sat-
urated peak intensities or to saturation. Avoid this by a proper adjustment of the
Exposure
Time and Master Gain (see section Camera Settings ).
The Black Level setting of the camera introduces an offset to the brightness level for all illu-
minated pixels and should be adjusted in such way that the minimum (noise) line is visible. See
section
Camera Settings for a detailed description.
In the Lineview panel the influence of the Noise Cut Level setting can be observed easily. The
Noise Cut Level defines a minimum threshold brightness level. Only measurements from pixels
that exceed this threshold are used during subsequent data analysis. The effect of the Noise
Cut Level on the Lineview panel is shown in the images below. One use of this function is to
mitigate the effect of a significant ambient light level on the determination of spot centroids. The
ambient light background can be rejected by setting the 'Noise cut level' to a value higher than
the valleys in the diagram.
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