29a
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Calibration
this is
a must calibration for any CCD camera set up.
After
deciding on how one wants the data to be displayed correlation with the CCD to
graph must be accomplished.
Here I want the data to be
displayed on the graph as if the laser were at my back and the CCD to my front.
As if I were watching the light hit the
CCD while facing
the
CCD with the light source over my back.
It gets confusing when one looks at the display LCD of the
camera since it reverses the image because it thinks the lens is still
installed--so it is not the way to go.
Also the image
that gets shown on the bitmap image you use to measure the location, will not
always display the way you think it will.
SO doing a
calibration is essential.
I shot the CCD with the laser
at known spots like 2 shots in the upper left corner while looking at the CCD
from the front side with the laser over my back.
Then
forgetting how it looks thru the LCD and how it shows up on the bitmap I used
the location from the bitmap to be sure those spots displayed on the upper left
of the graph. And so on for the other spots. Then I know the CCD maps to the
graph as if one looks at the front of the CCD or graph and the laser is over the
sholder. This makes life and interpertation of what is happening a bit
easier.
If other systems do differently the end result
will be the same.