11Beamage-3 User
’s Manual Revision 4.0
35
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The beam
“Centroid”
corresponds to the beam
’s first order distribution as defined by the ISO-11146-
1:2005 and ISO-11146-2:2005 standards (refer to Annex A)
The beam
’s
“Peak”
position corresponds to the pixel’s peak value position. If many pixels correspond to
the peak value, the crosshair will be centered on the first peak.
The beam
“Peak to Average Ratio”
corresponds to the ratio between the actual beam peak value and the
height of an equivalent simulated flat-top beam. The simulated beam
’s width is the 1/e
2
diameter of the
actual beam and has the same area (same energy). The software computes the ratios for both the X and
Y axes.
Figure 5-4 Peak to Average
These results are only available when the
“1/e2 along crosshairs (13.5%)”
beam diameter definition is
selected. If any other definition is used, the
“Peak to Average Ratios”
are not computed and dashes are
displayed. When the crosshair center is set to
“Centroid”
instead of
“Peak”
, results are grayed out to
remind the user that the values do not correspond to the
“Peak to Average Ratios”
.
Figure 5-5 Peak to Average Ratio Example
