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Optical edge-projection method for three-dimensional profilometry.

C J Tay1, H Miao, Y Fu

  • 1Department of Mechanical Engineering, National University of Singapore.

Optics Letters
|October 29, 2005
PubMed
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This study introduces a new optical edge-projection technique for accurately measuring the 3D surface contours of low-reflectivity objects. The method successfully mapped complex surfaces like woven carbon fiber and small objects, demonstrating its effectiveness.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Computer Vision

Background:

  • Accurate 3D surface contouring is crucial for quality control and analysis in various industries.
  • Traditional methods struggle with objects exhibiting low reflectivity or complex surface textures.
  • Existing structured light techniques often require specific surface properties or complex calibration.

Purpose of the Study:

  • To propose and validate a novel optical edge-projection method for 3D surface contouring.
  • To address the challenges of measuring objects with low reflectivity and dark surfaces.
  • To develop a robust technique applicable to diverse object types, including non-reflective materials.

Main Methods:

  • A structured light edge is projected onto the object's surface.

Related Experiment Videos

  • Image acquisition is performed using a Charge-Coupled Device (CCD) camera.
  • An active triangulation algorithm is employed for contour evaluation.
  • The optical edge is scanned across the entire object surface to obtain a whole-field 3D contour.

    • Main Results:

    • The proposed method successfully generated accurate 3D surface contours for a black, nonreflective woven carbon fiber object.
    • The technique was also effective in measuring the precise profile of a small object, such as a coin.
    • Demonstrated high accuracy in capturing the detailed topography of challenging specimens.

    Conclusions:

    • The novel optical edge-projection method provides an accurate and effective solution for 3D surface contouring of low-reflectivity objects.
    • The technique overcomes limitations of traditional methods when dealing with dark and non-reflective materials.
    • This approach offers a versatile tool for metrology applications requiring precise 3D surface measurements.