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Telecentric three-dimensional sensor with a liquid mirror for large-object inspection.

S Thibault1, E F Borra

  • 1National Optics Institute, Sainte-Foy, Québec G1P 4N8, Canada. thibault@ino.qc.ca

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This study introduces a novel device for fast, large-volume 3-D measurement using telecentric triangulation and liquid-mirror technology. The system enables precise scanning of objects up to 1 cubic meter with high resolution.

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Area of Science:

  • Optical Engineering
  • Metrology
  • 3-D Imaging

Background:

  • Traditional 3-D measurement systems face challenges in accurately scanning large objects efficiently.
  • Telecentric triangulation offers space invariance, beneficial for consistent measurements across large fields of view.
  • Liquid-mirror technology presents an opportunity for cost-effective, large-aperture optical systems.

Purpose of the Study:

  • To develop a device for 3-D measurement of large objects (1 m³) by integrating telecentric triangulation with liquid-mirror technology.
  • To enable fast scanning of large volumes by decoupling laser beam scanning from sensor head movement.
  • To demonstrate a low-cost, high-performance optical system for 3-D metrology applications.

Main Methods:

  • Designed a triangulation laser telemeter head incorporating a large liquid primary mirror and an aspheric secondary mirror.
  • Implemented a telecentric f-theta objective using the liquid-mirror system.
  • Decoupled laser beam scanning motion from the physical transport of the sensor head to facilitate rapid scanning.

Main Results:

  • A laboratory prototype achieved a standoff distance of 1.5 m and a telecentric scan range of 1 m.
  • The system demonstrated a depth of view of 1 m with a relative depth resolution of 0.5-1 mm.
  • The liquid-mirror objective exhibited diffraction-limited performance and low scattering in the visible spectrum.

Conclusions:

  • The developed device effectively leverages telecentric triangulation and liquid-mirror technology for efficient, large-volume 3-D measurement.
  • Liquid-mirror technology enables the creation of low-cost, large-aperture objectives suitable for advanced metrology.
  • The system's optical configuration and prototype performance indicate its utility for precise 3-D measurement tasks.