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4 Image Acquisition
Exposure Time > Read Out Time An new exposure cycle can be started as soon as the read out
of the previous frame has been started (See Fig. 4.11).
Exposure Time < Read Out Time The start of a new exposure has delayed by a certain amount
of time in order to ensure, that the exposure doesn’t end prior to the image read out end
of the previous frame (See Fig. 4.12).
The camera adjusts the timing automatically, and ensures that it complies with this restriction.
Frame start or frame burst start triggers which arrive too early and which violates the
overlapping restriction, will be ignored by the camera and indicated by a missed trigger event,
which can be counted by a counter (see Section 5.1.5 for more information how to count
missed triggers). Fig. 4.11 and Fig. 4.12 shows both timing situations, when the exposure time
longer than the read out time and when the exposure time is shorter than the read out time.
E x p o s u r e 1 R e a d O u t 1
F r a m e 1
E x p o s u r e 2 R e a d O u t 2
F r a m e 2
Figure 4.11: Overlapped Image acquisition when exposure time > read out time
E
x p o s u r e 1 R e a d O u t 1
F r a m e 1
E x p o s u r e 2 R e a d O u t 2
F r a m e 2
Figure 4.12: Overlapped Image acquisition when exposure time < read out time
4.6 Acquisition-, Frame- and Exposure-Trigger Configuration
The acquisition-, frame- and exposure timing can be controlled by 7 triggers:
• Acquisition Start Trigger
• Acquisition End Trigger
• Frame Start Trigger
• Frame Burst Start Trigger
• Frame Burst End Trigger
• Exposure Start Trigger
• Exposure End Trigger
Fig. 4.13 shows the signal path which is available for every of the 7 triggers. It contains:
• Trigger Source Selection
• Trigger Software
• Trigger Mode
• Trigger Activation
• Trigger Divider
• Trigger Delay
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