OPHIR BeamSquared, User Manual

Page: 101 / 112

Too small – The calculated beam diameter is
below 10 pixels. Measurement accuracy could be
lost. Accept frame or abort the run; adjust the
setup, and take a new measurement. This can be
done by using a longer focal length lens, or by
moving the lens and camera to where the beam
has diverged less and the beam at the lens is
smaller.
Ultracal – If the camera exposure setting is
changed during the run, a new Ultracal cycle
must be performed before the frame can be
accepted. Click
Redo Ultracal to initiate the
process. Ultracal is also used to compensate for
small changes in the camera baseline due to
changes in the camera temperature. This is
caused by the camera’s natural warm up time or
by ambient temperature changes.
As soon as a good frame is found, live playback stops. The user then has the following options:
Redo Ultracal – If the Ultracal cycle removed
the beam or another error occurred, click this
button to return to the
Ultracal step.
Accept Frame – Accept the current frame and
move on to the next Z location. If the beam has
quality issues, this icon turns yellow. A frame
cannot be accepted if live playback is running or
if a new Ultracal is required. When accepting the
frame on the last data point of the run, the
Step
by Step wizard automatically closes.
Live Playback – Re-enable live playback to view
the beam in real-time.
Single Frame – Collect a single new frame from
the camera.
After the setup completes, each accepted data point
appears in the
Measured Caustic Display
window. An estimated curve appears as soon as
enough data accumulates, stabilizing as the run
progresses. The results also update as the collection
process continues.
At the completion of a run, the data can be saved to
a file for further analysis.
Exposure 9.3.5
Only available when a camera is connected to the
software. Use the slider or the text box to enter the
Exposure for the camera. This determines the intensity
and quality of the output image.
When operating in Pulsed mode, the Pyrocam must be
externally triggered and the
Exposure control must be set
to a value slightly larger than the input pulse width.
Changing the exposure during a run is highly discouraged. Doing so could significantly affect the
results and requires a new Ultracal.