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Related Experiment Video

Updated: Jun 12, 2026

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Published on: May 15, 2017

Video high-density disk surface testing with a laser diode and a position sensor.

A Ono, K Sasaki, T Komatsu

    Applied Optics
    |June 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new optical surface tester was developed for video high-density disks (VHD). This technology effectively detects and maps surface defects larger than 10 micrometers, aiding VHD manufacturing improvements.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Manufacturing Technology

    Background:

    • Video high-density disks (VHD) require precise surface quality for optimal performance.
    • Existing surface testing methods may lack the sensitivity or resolution needed for micro-scale defect detection.

    Purpose of the Study:

    • To develop and validate an advanced optical surface tester for VHD.
    • To enable the detection, classification, and mapping of surface defects on VHDs.
    • To provide data for enhancing the VHD manufacturing process.

    Main Methods:

    • Utilized a laser diode to project a 10-micrometer diameter beam onto the VHD surface.
    • Employed a photosensor to detect the angle and intensity of the reflected laser beam.
    • Correlated changes in the photosensor signal with surface defects, verified by microscopic examination.

    Main Results:

    • The developed optical tester successfully detected surface defects larger than 10 micrometers.
    • The system accurately classified defects by category and size.
    • A defect map was generated on a monitor, visualizing surface imperfections.

    Conclusions:

    • The optical surface tester is a viable tool for VHD quality control.
    • The technology facilitates the identification of critical surface defects impacting VHD performance.
    • Data from the tester can drive significant improvements in VHD manufacturing processes.