Figure 1: Sensor's view and settings with a sensor with max. height of 1024 pixels/lines (e.g. -x02e /
-1013)
Scenarios
With regards to the external trigger signals provided by an incremental encoder, there are two
possible scenarios:
A conveyor belt runs continuously and so does the incremental encoder, or - like in a
reverse vending machine,
1.
a single item is analyzed and the conveyor belt and so the incremental encoder stops after
the inspection and restarts for the next item.
2.
In the first scenario you can use the standard settings of the MATRIX VISION devices. Please have
a look at the sample Triggered linescan acquisition with exposure time of 250 us which shows how
you can set the linescan mode with continuous materials and signals from the encoder. However, it
is absolutely required that the external trigger is always present. During a trigger interruption,
controlling or communication to the camera is not possible.
In the second scenario, the external trigger stops. If there is a heartbeat functionality in the system
(e.g. with GigE Vision), there can be a halt of the system. Please have a look at the sample
Triggered linescan acquisition with a specified number of image blocks and pausing trigger signals
which shows how you can handle pausing trigger signals.
18.2.6.3 Sample 1: Triggered linescan acquisition with exposure time of 250 us
This sample will show you how to use the linescan mode of the sensors -1013 and -1013GE using
an external trigger provided by an incremental encoder which sends a "trigger for every line" (1:1)
Note:
You can also use the sensor -1020 . However, the sensor is slower due to the higher
number of pixels.
In this sample, we chose an exposure time of "250 us" and to ease the calculations we used "1000
px image height".
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