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Grating projection system for surface contour measurement.

Cho Jui Tay1, Madhuri Thakur, Chenggen Quan

  • 1Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.

Applied Optics
|March 31, 2005
PubMed
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This study presents a low-cost grating projection system for surface contour measurement. The technique uses a phase-shifted grating and CCD camera, offering a viable alternative to mechanical stylus methods.

Area of Science:

  • Optical Metrology
  • Surface Characterization
  • Computer Vision

Background:

  • Grating projection systems offer a cost-effective approach to surface contour measurement.
  • Recent advancements in computing power and image processing have revitalized interest in this technique.
  • Accurate surface profiling is crucial across various industrial and scientific applications.

Purpose of the Study:

  • To describe a novel grating projection method for surface contour measurement.
  • To evaluate the performance of this technique using experimental data.
  • To compare the results with established mechanical stylus methods.

Main Methods:

  • A phase-shifted grating is projected onto an object's surface via a lens.
  • A Charge-Coupled Device (CCD) camera captures the deformed grating image.

Related Experiment Videos

  • Phase variations are induced using a linear translation stage for grating movement.

    • Main Results:

    • The developed grating projection system successfully captured surface contours.
    • Experimental results demonstrated the system's capability for detailed surface profiling.
    • Comparison with mechanical stylus measurements validated the accuracy of the proposed method.

    Conclusions:

    • The described grating projection system provides an effective and low-cost solution for surface contour measurement.
    • This technique shows promise as an alternative to traditional methods like mechanical stylus profiling.
    • Further development could expand its applicability in diverse fields requiring precise surface analysis.