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lens centering error measurement

Discussion in 'General Electronics' started by ganesh, Jun 3, 2004.

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  1. ganesh

    ganesh Guest

    Can you suggest a method to measure centering error of lens using
    frame grabber
    card plugged in a PC?

    Our test set up is as follows--We have a autocollimating optical
    head mounted
    on the measuring unit. A CCD camera is placed at the focal point of
    autocollimator. The autocollimating optical head is focussing in the
    centre of curvature of the lens.When rotating the lens under test, if
    centering errors are present, the image of the target formed on the
    CCD will move correspondingly.

    Presently we go by visual judgement on the CRT monitor to find out the
    displacement , ( a reticle is formed through the collimator) by
    seeing how many divisions the reticle has moved.

    Kindly suggest a method to quantify the error with above setup?
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