Year-end Sale % OFF 
Abstract
The main purpose of this work is the evaluation of the potential of Terrestrial Laser Scanning (TLS) technology to perform a reflectance analysis of scanned objects. A laser beam, having a coherent beam in the field of visible light (wavelength between 532nm and 680 nm), can lead to optical diffraction phenomena that allow a correlation between the degree of crystallinity of solids (in particular dispersed crystalline materials) and its reflectivity. Different materials with known crystallinity values have been examined and the diffraction value has been analysed for two types of lasers, one pulsed and the other phase measurement, with two different acquisition conditions (nadiral and oblique position). The results demonstrated the correlation by verifying that the incident laser light beam is more refracted by materials with a higher degree of crystallinity than less crystalline or amorphous materials.
Highlights
The Terrestrial Laser Scanning (TLS) send an energy flow on object’s surface and its geometry is measured on the basis of the definition of an optical quantity of a portion of reflective energy
The results demonstrated the correlation by verifying that the incident laser light beam is more refracted by materials with a higher degree of crystallinity than less crystalline or amorphous materials
The results shown in the previous paragraphs show that, in addition to numerous parameters, such as colour, roughness, humidity, temperature, etc., the first crystal layers and Bravais lattices of the scanned material influence the reflectance value related to the interaction of the laser pulse generated by the TLS
Summary
The Terrestrial Laser Scanning (TLS) send an energy flow on object’s surface and its geometry is measured on the basis of the definition of an optical quantity of a portion of reflective energy. The laser ray lights an artificial surface in order to acquire a threedimensional (xyz) point cloud with a high-density and high-accuracy [1, 2]. The output of a scan is typically a point cloud of n observations consisting of 3D positions (xi, yi, zi)i = 1...n of each point in a Cartesian coordinate system with the origin in the laser scanner centre, as well as an uncalibrated intensity value of the reflected light. The scanner mechanism operates in a spherical coordinate system, with regular horizontal and vertical angle increments. The scanner detects the returned signal of reflection on a surface and records the two directional angles (horizontal angle, or longitude, θi, and vertical angle, or latitude, φi) and measures the range ρi to the object surface
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
