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Multiple Laser Stripe Scanning Profilometry Based on Microelectromechanical Systems Scanning Mirror Projection.

Gailing Hu1,2, Xiang Zhou3,4,5, Guanliang Zhang6,7

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This study introduces a new multiple laser stripe scanning profilometry (MLSSP) using a microelectromechanical systems (MEMS) scanning mirror. This method enhances 3D measurement accuracy and efficiency by controlling laser stripes and reducing noise.

Keywords:
3D measurementMEMS scanning mirrorMLSSPlaser stripe widthvibration noise

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Area of Science:

  • Optics and Photonics
  • Mechanical Engineering
  • Computer Vision

Background:

  • Traditional laser-based 3D measurement suffers from uncontrollable laser stripe width and noise from speckle and mechanical movement, reducing accuracy.
  • Existing methods often require object or camera movement, limiting scanning speed and efficiency.

Purpose of the Study:

  • To develop a novel multiple laser stripe scanning profilometry (MLSSP) system for improved 3D measurement.
  • To enhance scanning speed, accuracy, and image quality by utilizing a microelectromechanical systems (MEMS) scanning mirror.

Main Methods:

  • Implementation of a MEMS scanning mirror to project programmable, high-quality, movable multiple laser stripes.
  • Development of a full-field scanning technique that eliminates the need for object or camera movement.
  • Programming control over laser stripe brightness, width, and position.

Main Results:

  • Reduced speckle noise and more even light intensity distribution compared to traditional methods.
  • Elimination of noise caused by mechanical movement, leading to higher accuracy.
  • Significant reduction in the number of images required (by a factor of N) and N-fold increase in measurement efficiency.

Conclusions:

  • The proposed MLSSP system based on MEMS technology offers superior control over laser projection.
  • This method significantly improves the efficiency and accuracy of 3D measurement by overcoming limitations of traditional techniques.