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Testing aspheric surfaces: simple method with a circular stop.

A Handojo, H J Frankena

    Applied Optics
    |February 21, 2008
    PubMed
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    A novel noninterferometric method inspects circularly symmetric aspheres using spherical wave illumination and a central stop. This technique visualizes surface deviations by creating light and dark regions, simplifying asphere testing.

    Area of Science:

    • Optical Engineering
    • Metrology
    • Surface Inspection

    Background:

    • Traditional knife-edge tests can be limited for complex surfaces.
    • Inspecting circularly symmetric aspheres requires precise metrology.
    • Noninterferometric methods offer potential advantages in simplicity and robustness.

    Purpose of the Study:

    • To develop a noninterferometric method for inspecting circularly symmetric aspheres.
    • To extend the principles of the knife-edge test for aspheric surface analysis.
    • To provide a new approach for visualizing deviations from a perfect sphere.

    Main Methods:

    • Illuminating the aspheric test surface with a spherical wave.
    • Employing a small circular stop placed at the center of the best-fitting sphere.

    Related Experiment Videos

  • Analyzing the resulting image, which reveals light and dark regions corresponding to surface deviations.

    • Main Results:

    • The method successfully generates an image of the tested surface.
    • Boundaries of light and dark regions correlate with surface profile, stop size, and position.
    • The technique was demonstrated experimentally using a paraboloid surface.

    Conclusions:

    • The proposed noninterferometric method is effective for inspecting circularly symmetric aspheres.
    • This technique offers a simplified approach to visualizing aspheric surface deviations.
    • The method shows promise as an extension of traditional optical testing techniques.