Basler Vision Technologies Sprint Series, User Manual

Page: 91 / 236

Exposure Start and Exposure Time Control
Basler sprint Mono Cameras 81
Formula 4 :
Max Lines / s = 256410
Formula 2 returns the lowest value. So with the current camera settings, the maximum allowed line
rate would be 175438 lines per second.
The minimum allowed line period in this case would be:
Min Line Period = 0.0000057 = 5.7 µs
4.3.3 Increasing the Maximum Allowed Line Rate
You may find that you would like to acquire lines at a rate higher than the maximum allowed with
your current camera settings. If this is the case, you must first use the four formulas described on
page 74 to determine which factor is restricting the maximum line rate the most. Next, you must try
to make that factor less restrictive:
„
If you find that formula one (exposure time) is the most restrictive factor, you should decrease
the exposure time. Decreasing the exposure time will increase the maximum line rate yielded
by formula one. If you decrease the exposure time, you may need to compensate for a lower
exposure time by using a brighter light source or by increasing the opening of your lens
aperture.
„
If you find that formula two (sensor readout) is the most restrictive factor, you may be able to
adjust your AOI settings to decrease the Max Seg AOI Pixels. Using a smaller AOI can
decrease the Max Seg AOI Pixels. Decreasing the Max Seg AOI Pixels will increase the
maximum line rate yielded by formula two. Centering the AOI on the sensor may increase the
maximum line rate yielded by formula two.
If you are using a camera that has two or more sensor segments and the AOI is positioned so
that many pixels in the AOI fall into one sensor segment and few pixels fall into a neighboring
segment, you can try repositioning your AOI. The Max Seg AOI Pixels will be smallest when the
AOI is evenly divided across the two segments (i.e., each segment contains the same number
of AOI pixels). If the AOI covers two complete segments or more, the Max Seg AOI Pixels will
be 2048 and can not be decreased by repositioning the AOI.
„
If you find that formula three (pixel processing rate) is the most restrictive factor, you can
decrease the AOI length. Decreasing the AOI length will usually increase the maximum line
Max Lines / s
CL Clk Taps
×
12 Taps
× ( )
AOI Length p + +
----------------------------------------------------------------------------- =
Max Lines / s
80000000 8
×
12 8
× ( )
2400 0 + +
-------------------------------------------------- =
Min Line Period
1
175438
-------------------- =