Piranhs HS-xx Detailed Getting Started Guide
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29.
Enter
gcp
to view the camera parameter screen. The camera parameter
screen should report
CCD Direction: external/forward
If the reported status is incorrect, check that:
•
The connection of the direction control to the framegrabber
•
The framegrabber configuration to ensure that the hardware signal is
correctly routed through the framegrabber
30.
Have your system send the reverse direction signal on CC3 (low).
31.
Enter
gcp
to view the camera parameter screen. The camera parameter
screen should report
CCD Direction: external/reverse
32.
Enter the command
sem
exposure
mode
to select your operating exposure
mode.
33.
Enter the command
scd direction
to select your direction control method.
34.
Enter the command
wus
to save the operating state. On reboot, the camera
will power up in this state.
35.
Check the image with a real object with real motion. You should see good
image.
It is imperative that the direction of motion is correct. If vertical smearing
occurs even when using the correct line rate:
•
If you are using an external line rate, try using an internal line rate. Enter
sem 7
and then
ssf
line
rate
. If you receive a clipped to max warning
then you will have to change the Camera Link Mode.
•
Try changing the camera’s CCD shift direction using the
scd
direction
command.
Conclusion
This completes the procedure and your camera should now be imaging properly.
If you still need to improve your TDI image, you may want to try some of the
following tips:
•
In TDI Mode, gain can be adjusted by changing the number of stages. If you
reach the sensor
full well
, you will have to reduce the number of stages. This
is characterized by an increase in the PRNU and results from different
columns reaching the antiblooming level at different light levels. The camera
gain is designed so that the minimum specified gain does not cause the
sensor to reach full well.
•
It is very important that the sensor is aligned perpendicular to the direction
of motion of the object. The portion of an object which is imaged in a pixel at
the first stage of integration must also be imaged in the same column at the
last stage of integration, otherwise blurring of the image will occur.
•
If a system design dictates that constant exposure is required where line
speed variations or fluctuating illumination occurs, then some method of
controlled exposure must be incorporated. This can generally be achieved
with some type of synchronously strobed or intensity controlled
illumination, and because of the high sensitivity of the camera, LED
illumination systems can be reliably used. For further information on using
Full well is the maximum
charge that can be stored
in each pixel before it
drains into the substrate.
