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Imaging the surface of a half ball lens

  1. Oct 4, 2013 #1

    I'm new to this forum and I have an application where I want to image an object that is in contact with the round side of a half ball lens. I've attached a brief project description.

    I think this topic on optics is suitable for the Differential Geometry forum, but please let me know if it's not.

    The object in contact with the lens is shoulder joint cartilage and I do have the ability to illuminate it by inserting a light source behind the cartilage surface. The illumination wouldn't be great but probably enough to determine contact area with the lens, which is all I want.

    I'm not an expert in this field but I think that with the object being in contact with the lens (i.e. zero working distance), that there is no refraction.

    I need to know the focal length for a half ball lens of about 20 mm radius and the size of the sensor for a circular contact area on the lens with a 10 mm diameter.

    The challenge I'm having is determining the correct equations to use without a working distance.

    thank you

    Attached Files:

  2. jcsd
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