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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
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Superposition fringes as a measuring tool in optical testing.

J Schwider

    Applied Optics
    |March 10, 2010
    PubMed
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    Accurate air layer thickness measurements are possible using superposition fringes. Combining multiple-beam (Fabry-Perot) and two-beam interferometers offers a promising method for optical element adjustment and spherical surface testing.

    Area of Science:

    • Optical physics
    • Metrology

    Background:

    • Accurate measurement of thin air layers is crucial in optics.
    • Interferometry is a key technique for precise measurements.

    Purpose of the Study:

    • To explore the use of superposition fringes for highly accurate air layer thickness measurements.
    • To evaluate a combined multiple-beam (Fabry-Perot) and two-beam interferometer system.
    • To investigate applications in optical element adjustment and spherical surface testing.

    Main Methods:

    • Utilizing superposition fringes generated by a combined interferometer setup.
    • Analyzing contrast degradation in the combined system.
    • Developing a spherical Fizeau interferometer for surface testing.

    Main Results:

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    • Superposition fringes enable highly accurate air layer thickness measurements.
    • The combined interferometer system exhibits minimal contrast degradation.
    • A novel spherical Fizeau interferometer allows for surface testing of spheres using interference colors or rings.

    Conclusions:

    • The combined interferometer approach is effective for precise air gap metrology.
    • The spherical Fizeau interferometer presents a promising tool for advanced optical surface analysis.