LBP2 User Guide
Document No: 50306-001
Rev G 3/12/2020
Page 36
default setting and represents the second moment setting for a TEM
00
Gaussian beam.
2.5.2.3
Programmable % of Peak
%Peak Clip%
The legacy version of this result is based on a 1D analysis of the data lying
along the X/Y or M/m axis running through the centroid of the beam. Enter
the percent of the beam’s peak fluence that will define the clip level for
computing the beam widths and diameters using this method. 13.5% is the
default setting and represents the second moment setting for a TEM
00
Gaussian beam. To obtain a FWHM (Full Width Half Max) result set this value
to 50%.
2.5.2.4
Programmable Moving Slit % of Peak
D%ms Clip%
This result mimics the moving slit method as defined by
ISO 11146-3
. Enter
the percent of the beam’s peak fluence that will define the clip level for
computing the beam widths and diameters using this method. 13.5% is the
default setting and represents the second moment setting for a TEM
00
Gaussian beam. This method assumes the beam is TEM
00
(M²=1) to obtain a
FWHM (Full Width Half Max) result set this value to 50%.
2.5.3
Optical Scaling
If the camera is using an imaging optic, such as a beam expander/reducer, this
dialog box contains the entry to apply a pixel scaling factor in order to correct for
optical expansion or reduction effects.
Click on the ruler button to activate the optical scaling feature. When OFF, no
scaling will be applied. When enabled, enter a scaling Expansion or Reduction
factor in the edit control to compensate for an enlarged or reduced beam.
Values >1 indicate a larger field of view projected onto the imager. Examples
would be a beam reducer or a standard C-mount lens.
Values <1 indicate a smaller field of view projected onto the imager. Examples
would be a beam expander or a microscope objective.
