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Geometry for contouring by electronic speckle pattern interferometry based on shifting illumination beams.

Y Zou, H Diao, X Peng

    Applied Optics
    |August 25, 2010
    PubMed
    Summary

    This study introduces a new method for electronic speckle pattern interferometry surface contouring by shifting illumination beams. This technique establishes a novel relationship between phase shifts and surface depth, altering contour intervals and fringe sensitivity.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Surface Characterization

    Background:

    • Electronic speckle pattern interferometry (ESPI) is a non-contact optical measurement technique.
    • Surface contouring is crucial for dimensional analysis and quality control in various industries.
    • Existing ESPI contouring methods include two-wavelength and object-tilting techniques.

    Purpose of the Study:

    • To present a novel ESPI-based surface contouring method using shifted illumination beams.
    • To analyze the new relationship between phase shifts and surface depth.
    • To derive new forms for contour interval and fringe sensitivity.

    Main Methods:

    • Utilizing shifted illumination beams in an ESPI setup.
    • Analyzing the phase shift of interference speckle patterns.

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  • Developing a new geometric model for the shifted illumination configuration.
  • Investigating experimental conditions required for the method.

    • Main Results:

    • A new relationship between the shifted phase of interference speckle patterns and the depth of the test surface was established.
    • Novel expressions for contour interval and fringe sensitivity were derived.
    • The geometric configuration was presented and contrasted with existing methods.
    • Experimental validation confirmed the analytical findings.

    Conclusions:

    • The shifted illumination beam method offers a new approach to ESPI surface contouring.
    • The derived formulas for contour interval and fringe sensitivity are applicable to this specific geometric setup.
    • The method's requirements and geometric considerations provide a foundation for its practical implementation.