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Improved phase-measuring deflectometry for aspheric surfaces test.

Chunfeng Guo, Xiaoyan Lin, Anduo Hu

    Applied Optics
    |March 15, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an improved phase-measuring deflectometry (PMD) for testing aspheric surfaces. The novel method simplifies measurements by focusing on reflected rays, offering a new quantitative tool for optical manufacturing.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Surface Testing

    Background:

    • Accurate measurement of aspheric surfaces is crucial for advanced optical systems.
    • Traditional phase-measuring deflectometry (PMD) methods can be complex, requiring calibration or approximations for incident rays.

    Purpose of the Study:

    • To present an improved phase-measuring deflectometry (PMD) technique for efficient and quantitative testing of aspheric surfaces.
    • To simplify the measurement process by eliminating the need for incident ray determination.

    Main Methods:

    • The improved PMD method is explored by reversing the principles of the Ronchi test.
    • A camera aperture is positioned near the center of curvature of the test mirror.
    • Fringes displayed on an LCD screen are reflected off the aspheric surface and captured by the camera.

    Main Results:

    • Analysis of captured fringes allows for the determination of deviations from the ideal shape.
    • The aspheric surface under test is successfully reconstructed.
    • Computer simulations and preliminary experiments validate the improved PMD's effectiveness.

    Conclusions:

    • The improved PMD offers a simplified approach to aspheric surface metrology.
    • This method requires only the determination of reflected rays, bypassing complex calibration steps.
    • It provides a new, quantitative, full-field measurement tool for optical manufacturing.