Terrestrial Laser Scanning Systems

1. Terrestrial Laser Scanning Systems Sara Walsh

2. Overview • Features • How laser scanning works • Time of flight • Phase Shift • Operation • Leica HDS 2500 • Other models • Applications

3. Features of Laser Scanning • Captures 3D position data of any point • Dense data acquisition • Non-contact  No need for instrumentation of sensors on structure • Ability to capture data for structures that are not easy to access • Reasonably accurate for many applications • Versatile • Efficient • Easy to use

4. How Laser Scanning Works • Time of Flight • Measures time it takes a laser pulse to travel to target and back to determine distance Image: herkules.oulu.fi

5. How Laser Scanning Works • Phase Shift • Measures change in phase of multiple sinusoidal laser pulses to determine time and distance Image: www.optical-metrology-centre.com

6. Leica HDS 2500 • Time of flight • Accuracy: ± 6 mm • Range: Up to 100 m • Scan rate: 1000 pts/s • Field of View: 40° by 40° • Software: Cyclone

7. Operation • Set up equipment • Scanner, computer • Position targets as needed • Scan • Use software for post-processing • Visualization • Stitching/Registration • Meshing

8. Other Scanning Systems • Leica • HDS 6000 • Faro • LS 880 • Riegl • LMS Z420 • Optech • Trimble • Price range: $70,000-$150,000 Faro LS 880 Riegl LMS Z420

9. Applications Historical Documentation Palace Museum in the “Forbidden City” in Beijing Images from www.leica-geosystems.com

10. Applications  Survey Construction Inspection  Images from www.leica-geosystems.com

11. Applications As-built documentation   Retrofit Images from www.leica-geosystems.com

12. Applications The Big Dig • Survey • Closeout drawings Images from www.leica-geosystems.com

13. Applications Forensics • I-35 W bridge in Minnesota • Riegl LMS Z420

14. Questions?