AW00089317000 Image Acquisition Control
Basler ace GigE 135
7.10 Acquisition Monitoring Tools
7.10.1 Exposure Active Signal
Exposure Active on Global Shutter Cameras
Valid for
All cameras
Except acA1920-25, acA2500-14
For acA1300-60 and acA1600-60: Only valid if they are operated in the global shutter mode
Cameras with a global shutter imaging sensor can provide an "exposure active" (ExpAc) output
signal. On these cameras, the signal goes high when the exposure time for each frame acquisition
begins and goes low when the exposure time ends as shown in Figure 73. This signal can be used
as a flash trigger and is also useful when you are operating a system where either the camera or
the object being imaged is movable. For example, assume that the camera is mounted on an arm
mechanism and that the mechanism can move the camera to view different portions of a product
assembly. Typically, you do not want the camera to move during exposure. In this case, you can
monitor the ExpAc signal to know when exposure is taking place and thus know when to avoid
moving the camera.
When you use the exposure active signal, be aware that there is a delay in the rise
and the fall of the signal in relation to the start and the end of exposure. See
Figure 73 for details.
Exposure
Frame N
Exposure
Frame N+1
Exposure
Frame N+2
Exposure
ExpAc
Signal
2 µs to3.5 µs
10 µs to 26 µs
2 µs to 3.5 µs
10 µs to 26 µs
Timing charts are not drawn to scale
Times stated are typical
Fig. 73: Exposure Active Signal on Cameras with a Global shutter
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