Obstacle detection and spectral discrimination using multi-wavelength motionless wide angle laser scanning

Obstacle detection and spectral discrimination using multi-wavelength motionless wide angle laser scanning.

Static laser scanning over a wide angle is demonstrated by ranging to 20 laser beams generated by a novel cylindrical quasi-cavity waveguide, using laser triangulation. Baseline distances and outgoing angles unique to each laser beam are calculated by modelling the triangulation arrangement using a system of linear equations and plotting principal rays. The quasi-cavity waveguide, imaging lens ...

Multi-Wavelength Laser Sensor for Intruder Detection and Discrimination

An intruder detection and discrimination sensor with improved optical design is developed using lasers of different wavelength to demonstrate the concept of discrimination over a distance of 6m. A distinctive feature of optics is used to provide additional transverse laser beam scanning. The sample objects used to demonstrate the concept of discrimination over a distance of 6m are leaf, bark, b...

Multi-wavelength Airborne Laser Scanning for Archaeological Prospection

Airborne laser scanning (ALS) is a widely used technique for the sampling of the earth’s surface. Next to the widely used geometric information current systems provide additional information about the signal strength of each echo. In order to utilize this information, radiometric calibration is essential. As a result physical observables that characterise the backscatter characteristic of the s...

Multi-wavelength Laser Photoacoustics

3d Modelling of Buildings Using Laser Scanning and Spectral Information

In this paper an approach for 3D building modelling based on laser scanning data combined with spectral information is presented. Airborne laser scanners offer a new efficient method for 3D data acquisition (DEMs) in urban environment. However, for automatic building recognition and reconstruction, other 3D objects like vegetation or vehicles have to be excluded from the acquired DEM. Therefore...