Sigma LBA-400 Manuel D’Utilisation
Example: With the Capture Interval set to 10, and a 30 Hz frame rate camera, the capture rate will be 3 fps.
5.2.1.2 With Trigger Type set to Trigger Out
The frame rate of the camera and the Trigger and Capture Intervals will combine to determine
the capture rate.
Example: With the Capture Interval set to 10, and the Trigger Interval set to 5, the captures will occur once for
each 50 frames. If your camera has a 25 Hz frame rate, the capture rate will be once every 2 seconds, or 1/2 Hz.
5.2.1.3 Trigger Type set to Video Trigger with the LBA firing the laser
The frame rate of the camera and the Trigger and Capture Intervals will combine to determine
the capture rate.
the capture rate.
Example: If the LBA is being used to trigger the laser, and the Capture Interval is set to 10, with the Trigger
Interval set to 10, the captures will occur once for each 100 frames. If your camera has a 25 Hz frame rate, the
capture rate will be once every 4 seconds, or 1/4 Hz.
In the above example, only frames that satisfy the Video Trigger Level threshold value will be
counted. Thus if some of the laser shots are too low in energy, the resulting acquisition rate will
lengthen in multiples of the Trigger Interval.
5.2.1.4 Trigger Type set to Video Trigger without the LBA firing the laser
The frame rate of the camera and the laser pulse rate will combine to determine the capture
rate. Only frames that satisfy the Video Trigger Level threshold value will be counted. Thus if
some of the laser pulses are too low in energy, those shots will not be included in the Capture
some of the laser pulses are too low in energy, those shots will not be included in the Capture
Interval count, resulting in slower acquisition rates.
Example: If the LBA is not being used to trigger the laser, and the Capture Interval is set to 10, the captures will
occur once for each 10 times that the laser fires. If the laser fires at a 2 Hz rate, then the capture rate will be once
every 5 seconds, or 1/5 Hz.
5.3 Integration
Control
If you have purchased the digital camera option then multiple frame integration can be performed when
using certain select digital cameras. This feature is not usually required for laser beam analysis
because most lasers are much too bright when compared to camera sensitivity. However outputs from
because most lasers are much too bright when compared to camera sensitivity. However outputs from
some fiber optic systems and laser diodes at certain wavelengths can be hard to detect at normal
integration times. To overcome this problem we have added a camera integration control. This feature
is limited to Digital cameras that maintain frame, line and pixel clock signals during the non-readout
periods. These cameras further constrain the integration times to multiples of the normal frame
integration period. Furthermore, these cameras provide a TTL input signal that allows the LBA frame
grabber to control the integration timing.
grabber to control the integration timing.
Operator’s Manual
LBA-PC
Doc. No. 10654-001, Rev 4.10
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