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Laser Scanning Systems. Prepared by Kerry Hall. University of Illinois at Urbana-Champaign. Desired Parameters. Fast collection of many points Non-contact Adequate measurement volume Adequate accuracy Using a laser. Basic Methods. Time of Flight Precise time measurement multiplied by c

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laser scanning systems

Laser Scanning Systems

Prepared by Kerry Hall

University of Illinois at Urbana-Champaign

desired parameters
Desired Parameters
  • Fast collection of many points
  • Non-contact
  • Adequate measurement volume
  • Adequate accuracy
  • Using a laser
basic methods
Basic Methods
  • Time of Flight
    • Precise time measurement multiplied by c

t - Measured time

c / n - Speed of light in air

  • Phase-Shift
    • Measures phase-shift of wave
    • Uses multiple frequencies to measure large distance and refine

- Measured phase angle

λ- Wavelength

faro laser scanner
Faro Laser Scanner
  • Phase-shift measurement of infrared for distance
    • 76m, 9.6m , 1.2m wavelengths
  • Accurate measurement of mirror and unit rotation
    • 0.009° vertical resolution, 0.00076° horizontal
  • Collects data spherically
    • 360°x320°x76m field of vision
faro laser scanner5
Faro Laser Scanner
  • Non-contact, no markers required
  • 120,000 points/sec
  • 3mm (0.1”) linearity error at 10 m
  • “Registration” spheres used to splice scans
faro applications
Faro Applications
  • Verification in construction and manufacturing
    • Identifies differences from expected shapes
    • Useful in generating as-built drawings
  • Surveying volumes and surfaces
    • Accurate volume calculation
  • Forensics
    • Quick measurement of position and shape of every object
similar systems
Similar Systems
  • NVision MobileScan 3D
    • Non-contact
    • 0.01” accuracy
    • 34,000 pts/sec
    • Stand-off distance limited to 40”
  • Leica HDS3000 Laser Scanning System
    • Time of Flight measurement
    • 1800 pts/sec
    • 6mm (0.2”) accuracy at 50m
    • Calculated 1.5mm if targets are planar
    • 360°x270°x100m(328ft) field of vision
conclusions
Conclusions
  • Faro most useful for large areas with many points
    • 1/8” error too great for many structures experimental applications
    • Not sufficient for strain or crack width, questionably crack location
  • Similar systems limit range
    • Inverse relation between range and accuracy
proprietor links
Proprietor Links
  • www.faro.com
  • www.nvision3d.com
  • www.leica-geosystems.com