OPHIR BeamSquared, User Manual

Page: 89 / 112

Operation Problems 7.2
Problem Symptoms Possible Solutions
An Automated Mode
M
2
measurement run
stalls
The run has stopped with one or more beam
image quality issues that the automated system is
unable to overcome.
 If the beam image is too dim or too
bright, adjust either external
attenuation or camera exposure time.
A new Ultracal is required before the
run can continue.
 If the beam image is misaligned stop
the run and repeat the alignment
procedure
in section 2.5.3.
Alternatively, use the Boundary
Check option to ignore the
misalignment (compromises accuracy).

If the beam image is too large it is
typically a result of samples taken too
far away from the waist with highly
divergent beams. Try adjusting the run
configuration to start or stop the run
closer to the waist.
 If the image is too small then it is
because the diameter of the beam is
less than 10 pixels. Change to a longer
focal length lens or adjust the position
of the BeamSquared unit along the
beam propagation path.
BeamSquared reports
that the step spacing
in Automated Mode
may be too large.
 Determination of the appropriate step
size by BeamSquared is only a
heuristic. You may still be able to
achieve an ISO defined 11 sample run.
Try an experimental run using your
preferred settings. If at least 11
samples are taken, in the correct
location in relation to the Rayleigh
lengths and the results are otherwise
satisfactory you may safely continue to
use the configured step size.
 If ISO compliance is not necessary you
may set the step size at whatever best
meets your needs.
BeamSquared
performs an excessive
number of Ultracal
operations during a
measurement run.
Run times are very long, as each Ultracal requires
additional time.  The most likely cause is bad pixels in
the camera detector. Contact Customer
Service for assistance.
 CCD cameras are sensitive to ambient
temperature. Do not place the
BeamSquared unit near an air
conditioning or heater vent that may
be cycling off and on during the run.