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Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

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Correcting image distortion with fiber-optic tapers.

R A King, A L Broadfoot, B R Sandel

    Applied Optics
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    This summary is machine-generated.

    This study presents an ultraviolet camera system for rotating spacecraft. A novel fiber-optic bundle design effectively cancels image motion caused by spacecraft spin, ensuring clear images.

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    Area of Science:

    • Spacecraft instrumentation
    • Optical engineering
    • Ultraviolet imaging

    Background:

    • Spacecraft-mounted cameras often face image motion challenges due to rotation.
    • Charge-coupled devices (CCDs) are sensitive detectors used in space imaging.

    Purpose of the Study:

    • To develop a method for canceling image motion in an ultraviolet camera on a rotating spacecraft.
    • To improve image clarity and data quality from space-based UV observations.

    Main Methods:

    • Utilized a Burch configuration camera with a spherical focal surface.
    • Synchronously stepped image charge in a charge-coupled detector to counteract spin-induced motion.
    • Employed a tapered fiber-optic bundle with a precisely figured cylindrical surface.

    Main Results:

    • Successfully canceled image motion caused by spacecraft spin.
    • Demonstrated efficient flattening of the velocity field on the camera's spherical focal surface.
    • The fiber-optic bundle design proved effective in achieving motion cancellation.

    Conclusions:

    • The proposed method effectively cancels image motion in rotating spacecraft UV cameras.
    • Tapered fiber-optic bundles are a viable solution for improving image stability in spaceborne optical systems.
    • This technique enhances the utility of UV cameras for detailed space observation.