Baumer VisiLine, Руководство пользователя

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9.7.5 Double Shutter
This feature offers the possibility of capturing two images in a very short interval. Depend-
ing on the application, this is performed in conjunction with a flash unit. Thereby the first
exposure time (t
exposure
) is arbitrary and accompanied by the first flash. The second expo -
sure time must be equal to, or longer than the readout time (t
readout
) of the sensor. Thus the
pixels of the sensor are recepitve again shortly after the first exposure. In order to realize
the second short exposure time without an overrun of the sensor, a second short flash
must be employed, and any subsequent extraneous light prevented.
Trigger
Prevent Light
Exposure
Readout
Flash
On Baumer VisiLine IP cameras this feature is realized within the sequencer.
In order to generate this sequence, the sequencer must be configured as follows:
Parameter Setting:
Sequencer Run Mode Once by Trigger
Sets of parameters (o) 2
Loops (m) 1
Repeats (n) 1
Frames Per Trigger (z) 2
Device Reset 9.8
The feature Device Reset corresponds to the turn off and turn on of the camera. This is
necessary after a parameterization (e.g. the network data) of the camera.
The interrupt of the power supply ist therefore no longer necessary.
Figure 42 ►
Example of a double
shutter.