Leica Laser System
Two HDS-2500 laser scanners manufactured by Leika Geosystems HDS, Inc. are available for researchers at the nees@berkeley equipment site. The scanner has a maximum 40° x 40° field-of-view and SmartScan Technology™- for added scanning control - to let users create highly accurate deliverables while minimizing both scan time and image reduction time for a wide range of applications and project sites. With a single-point range accuracy of ±4mm, angular accuracies of ± 60 micro-radians, and a beam spot size of only 6mm from 0-50m range, the HDS-2500 delivers survey-grade accuracy while providing a versatile platform for data capture. Its 360° x 195° pan & tilt mount and dual internal rotating mirrors enable it to be deployed in virtually any orientation. The combination of high accuracy and field versatility makes the HDS-2500 ideal for fixed or raised installation when leveled tripod mounting is not practical, or for applications with less stringent field-of-view requirements.
Because of its high accuracy over large distances the scanner has a number of successful applications in many fields including civil engineering. The scanner and associated software package produce a 3D image of structure points called point cloud. The instrument is ideal for accurately capturing details of as-built structures, for structural monitoring of cultural heritage buildings, and estimating structural damage in a building based on analysis of before- and after-earthquake scans. As an example of its usefulness in earthquake engineering, scans of a two story wood frame building in a shaking table test are presented here. The scans were performed before and after the shaking table test to estimate residual displacements of the building and obtain a 3D image describing point-to-point displacement of the building. The images below show the global view of 3D scan of the building after the test, the photo of the building during the test, and a contour of residual out-of-plane deflections of the north wall after the test.
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| Global view of 3D-scan | Building during the test | Deflection contour of north wall |
