AW00118508000 Acquisition Control
Basler racer Camera Link 91
Factor 2, the exposure time, is the most restrictive factor. In this case, the exposure time setting is
limiting the maximum allowed line rate to 5117 lines per second. If you wanted to operate the
camera at a higher line rate, you would need to lower the exposure time.
Because the exposure time is the most restrictive factor, you could also remove the limit from the
ExposureOverhead parameter to increase the line rate. In this case C
1
= 3.4 µs would apply and
the formula for Factor 2 a maximum allowed line rate of 5170 lines per second would result.
For more information about removing the limit from the ExposureOverhead parameter and the
resulting side effects, see Section 6.4.2.
6.4.2 Removing the Parameter Limits for the
Exposure Overhead Parameter
By removing the parameter limits for the ExposureOverhead parameter you can improve the line
acquisition with respect to either of the following two goals:
You can extend the exposure time: When operating a camera at a maximum allowed line rate,
the interval between two consecutive line start triggers will consist of the exposure time and
the time needed to prepare the sensor for the next acquisition.
In this situation, the time available for exposure will sometimes, despite bright illumination, be
too short for obtaining a sufficiently bright image. To brighten of the image at a given high line
rate, you can remove the parameter limits for the ExposureOverhead parameter. As a
consequence, the exposure time can be somewhat extended at the expense of the sensor’s
"preparation time" that will be shortened accordingly. Note that the image quality will somewhat
decrease.
You can increase the maximum allowed line rate: If you remove the parameter limits for the
ExposureOverhead parameter, if you do not extend the exposure time accordingly, and if the
exposure time is the determining factor for the maximum allowed line rate (Factor 2), you will
be able to increase the maximum allowed line rate to some extent (see Section 6.4.1). Note
that the image quality will somewhat decrease.
If you chose to extend the exposure time you can use the timed and trigger width exposure modes
(see Section 6.1.4.2 on page 62 and Section 6.1.5.2 on page 65 for information about the timed
exposure mode and Section 6.1.5.2 on page 65 for information about the trigger width exposure
mode):
When the camera is set for the timed exposure mode, the upper limit of the ExposureTime
parameters increases according to the decrease of the "preparation time".
When the camera is set for the trigger width exposure mode, you can extend the ExLSTrig
signal period according to the decrease of the exposure overhead time. To maintain the line
rate, increase the ExposureOverlapTimeMaxAbs parameter value by the amount of time that
was gained for exposure time.
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