OPHIR BeamSquared - Page 48

Frame (Quantitative)
The Frame (Quantitative) results are computed in real-time when in Live Playback mode or for the
selected data point in the Measured Caustic Display window. This group provides the basic beam
calculations. When viewing a data point from a run, the Z location of that point is also shown. During Live
Playback mode, these results may not be very meaningful although they do provide an idea of how high or
low the peak energy is relative to camera saturation.
Beam Width
Measured beam width based on the selected beam width basis.
Z Location
The camera location when the frame was generated, measured from the lens.
% in Aperture
The percentage of the total frame energy that lies inside the aperture.
Centroid
The center of mass of all pixels within the aperture.
Peak Location
The pixel location inside the aperture that has the highest intensity.
X-Sec Area
The cross-sectional area of the beam contained by the computed beam width.
Sequence ID
The ordered sequence ID of the frame.
Width
The width of the frame based on the unit of measurement selected.
Height
The height of the frame based on the unit of measurement selected.
Timestamp
Indicates when the current frame was generated.
Pixel Scale
The pixel scale value of the camera used when the frame was generated.
Bits per Pixel
The bits per pixel of the camera used when the frame was generated.
Total
The sum of the digital counts of all of the pixels within the aperture; represents
the intensity of the beam.
Average Pwr Density
The total beam intensity divided by the cross-sectional area.
Peak
The digital count of the pixel with the highest intensity within the aperture.
Min
The digital count of the pixel with the lowest intensity value within the aperture.
Laser
Results in the Laser group contain computed values for the laser under analysis. Both the X and Y axial
results are computed where applicable. These items are:
M
2
M
2
The beam propagation ratio.
BPP
BPP
The beam parameter product.
Divergence
Θ
0
The far field divergence of the laser. If the result name appears as Fitted
Divergence, it denotes that the divergence results are obtained from the fitted
curve rather than the beam width values at the lens focal length.
Waist Width
W
0
The waist width of the laser.
Waist Location
Z
0
The location of the laser’s waist measured from either the laser faceplate or
BeamSquared reference datum.
Rayleigh Length
Z
R
The Rayleigh length of the laser.
Astigmatism
Ast
A computed ratio indicating the degree to which the laser X and Y waist
properties exhibit astigmatic behavior.
Asymmetry
Asy
A computed ratio of the X and Y waist widths.
K
K
The beam propagation factor.