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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Inline application of digital holography [Invited].

Markus Fratz, Tobias Beckmann, Joachim Anders

    Applied Optics
    |December 25, 2019
    PubMed
    Summary

    Inline digital holographic sensors (HoloTop) were integrated into a precision turning plant for automated quality control. This system successfully monitored 10 million parts over a year, proving its industrial viability.

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    Area of Science:

    • Manufacturing Engineering
    • Metrology
    • Optical Sensing

    Background:

    • Automated quality control is crucial in precision manufacturing.
    • Inline inspection systems must be robust and stable for industrial use.
    • Digital holographic sensors offer high-resolution metrology capabilities.

    Purpose of the Study:

    • To integrate the HoloTop digital holographic sensor into a precision turning plant.
    • To develop a fully automated part-handling system for inline inspection.
    • To validate the long-term suitability of the system for industrial production.

    Main Methods:

    • Inline integration of the HoloTop sensor.
    • Development of an automated part-handling system.
    • One-year, multishift operation data collection on 10 million parts.

    Main Results:

    • Successful integration of the HoloTop sensor and automated handling system.
    • Continuous operation in a multishift production environment since 2015.
    • Presentation of one-year, long-term height measurement data for 10 million parts.

    Conclusions:

    • The HoloTop digital holographic sensor system is suitable for industrial use.
    • The integrated system demonstrates stability and reliability under rough production conditions.
    • This study provides the first long-term verification of such a system in a production setting.