User guide

LBA-USB User Guide Document No: 11294 Page 31
2.2 Options Menu
2.2.1 Show/Hide the Capture, Display and Aperture
Toolbars
These three toolbars can be alternately displayed or hidden based on operator
preference.
The Capture and Display toolbars can be modified to match the operator’s
needs.
The Aperture toolbar is predefined and cannot be modified by the operator.
2.2.2 Aperture…
LBA-USB can display three types of apertures in four different shapes.
Three types of apertures
 Drawn – Manually draw a WHITE aperture for the purpose of isolating beam
analysis to the pixel data contained within the aperture. This feature allows the
elimination of the effects of noise or stray energy in regions outside of the beam
under test.
 Displayed – The BLACK displayed aperture is not really an aperture; it is an
overlaid graphical representation of the computed shape and size of the beam
width/diameter results. This BLACK aperture provides a way for the user to
visually see the beam width, and observe how it changes.
 Auto – This feature automates the task of drawing an optimally sized and placed
aperture around the beam profile being measured. This aperture is displayed in
YELLOW. It performs the same function as the Drawn aperture, except that it
continuously resizes itself to changing beam conditions.
All three of the above apertures can be enabled and visible at the same time on
a 2D display. In the 3D display mode, no apertures are ever displayed. However,
the Drawn and Auto apertures can be operating as described above. If the
apertures are enabled while in the 3D display mode, be sure to check their setup
in the 2D display mode.
The Drawn and Auto apertures, when operating at the same time, function in
the following manner:
1. The Drawn aperture isolates the energy for analysis.
2. An Auto Aperture is computed and drawn around the beam energy.
3. The reported beam widths/diameter is computed based on the energy contained
exclusively within the Auto Aperture.
Aperture Shapes