scholarly journals A novel method for approximating local changes in the surface absorption for laser marking using 3D laser scanning

2021 ◽  
Vol 1135 (1) ◽  
pp. 012002
Author(s):  
Anders F. Mikkelstrup ◽  
Anders N. Thomsen ◽  
Morten Kristiansen
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Surface Oxidation ◽  
Laser Wavelength ◽  
3D Laser Scanning ◽  
Surface Absorption ◽  
Laser Marking ◽  
Sheet Metal Parts ◽  
Degree Of Oxidation ◽  
Novel Method

Abstract Laser marking is a non-contact technique, which achieves colouring by using a laser beam to increase surface oxidation. Controlling the amount of heat induced into the part is essential in ensuring the desired degree of oxidisation. However, the induced heat is not only dependent on the process parameters, but also on the surface absorption, which in turn is dependent on the material, laser wavelength, and surface quality, i.e., current degree of oxidation and contaminants as well as surface roughness. This paper proposes a method for correlating backscatter from a 3D laser scanner with the surface absorption of sheet metal parts. The purpose is to determine local changes in the surface absorption caused by surface oxidation and contamination. The method utilises a 3D laser scanner, which projects a laser line at the surface and measures the resulting backscatter at an angle. The proposed solution applies a bi-directional reflectance model to reduce the influence of varying scanning angles. The method’s sensitivity to variations in surface treatments is investigated and validated against backscatter spectroscopy measurements. The results show that the proposed method can identify changes in the absorption. However, these were, in some cases, more than 70% higher compared to spectroscopy measurements.

Design of Light-Small Mobile 3D Laser Measurement System

2013 ◽  
Vol 405-408 ◽  
pp. 3032-3036
Author(s):  
Yi Bo Sun ◽  
Xin Qi Zheng ◽  
Zong Ren Jia ◽  
Gang Ai
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Digital Camera ◽  
Scanning System ◽  
Point Cloud Data ◽  
3D Laser Scanning ◽  
Large Area ◽  
Cloud Data ◽  
Laser Scanning System

At present, most of the commercial 3D laser scanning measurement systems do work for a large area and a big scene, but few shows their advantage in the small area or small scene. In order to solve this shortage, we design a light-small mobile 3D laser scanning system, which integrates GPS, INS, laser scanner and digital camera and other sensors, to generate the Point Cloud data of the target through data filtering and fusion. This system can be mounted on airborne or terrestrial small mobile platform and enables to achieve the goal of getting Point Cloud data rapidly and reconstructing the real 3D model. Compared to the existing mobile 3D laser scanning system, the system we designed has high precision but lower cost, smaller hardware and more flexible.

A novel method for extracting skeleton of fruit tree from 3D point clouds

2020 ◽  
pp. 2050051
Author(s):  
Shenglian lu ◽  
Guo Li ◽  
Jian Wang
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Point Clouds ◽  
Fruit Trees ◽  
Fruit Tree ◽  
Tree Canopy ◽  
3D Point Clouds ◽  
Novel Method ◽  
Manual Interaction ◽  
Traditional Approaches

Tree skeleton could be useful to agronomy researchers because the skeleton describes the shape and topological structure of a tree. The phenomenon of organs’ mutual occlusion in fruit tree canopy is usually very serious, this should result in a large amount of data missing in directed laser scanning 3D point clouds from a fruit tree. However, traditional approaches can be ineffective and problematic in extracting the tree skeleton correctly when the tree point clouds contain occlusions and missing points. To overcome this limitation, we present a method for accurate and fast extracting the skeleton of fruit tree from laser scanner measured 3D point clouds. The proposed method selects the start point and endpoint of a branch from the point clouds by user’s manual interaction, then a backward searching is used to find a path from the 3D point cloud with a radius parameter as a restriction. The experimental results in several kinds of fruit trees demonstrate that our method can extract the skeleton of a leafy fruit tree with highly accuracy.

Research on Earthwork Calculating Methods Based on 3D Laser Scanning Technology

2012 ◽  
Vol 204-208 ◽  
pp. 618-621
Author(s):  
Bao Xing Zhou ◽  
Jian Ping Yue ◽  
Jin Li
Keyword(s):  
Point Cloud ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Accuracy Evaluation ◽  
Point Cloud Data ◽  
3D Laser Scanning ◽  
Cloud Data ◽  
Calculating Method ◽  
Validation Experiment ◽  
High Resolution Reconstruction

Terrestrial laser scanner (TLS) can provide the measurement of a large number of physical points distributed on the observed surface. A fast earthwork calculating method is proposed based on the redundant number of acquired points, which leads to a very accurate and high resolution reconstruction of the observed surfaces. This paper describes the three main steps of the method, namely the acquisition of the earthwork data based on TLS, the pre-processing of point cloud data, the earthwork calculation and accuracy evaluation based on point cloud data. Furthermore, it illustrates the performance of the proposed method with a validation experiment.

Ore Volume Measurement Based on 3D Laser Scanning Technique: a Case Study

2012 ◽  
Vol 610-613 ◽  
pp. 3708-3714
Author(s):  
Tien Thanh Nguyen ◽  
Xiu Guo Liu ◽  
You Huang ◽  
Hong Ping Wang ◽  
Quoc Lap Kieu ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Mining Industry ◽  
Original Data ◽  
Volume Measurement ◽  
3D Laser Scanning ◽  
Noise Elimination ◽  
Cloud Data ◽  
Data Registration ◽  
Scanning Technique

In the mining industry, conventional methods such as GPS and total station technology are used most extensively for data collection and in return used to compute volume of extracted materials (ore and waste). In situation where the ore body is bigger in size, and changes dynamically, the use of conventional method to measure volume of ore is not practicable and economically viable because of the workload involved, precision and accuracy of the survey and safety of workers. In this paper a method and work flow of ore heap volume measurement by using 3D laser scanning technique to acquire point cloud data was introduced. RiSCAN PRO and Geomagic studio was used to process the original data (registration, noise elimination, georeferencing, resampling etc.), 3D modeling and volume computations. A comparison on precision of geodetic control points coordinate measured by GPS receivers and 3D laser scanner was carried out. The results indicate that 3D laser scanning technique can effectively be applied to ore output volume measurement since it satisfies the requirement of ore volume measurement.

scholarly journals Valorización y difusión del patrimonio arqueológico mediante un entorno web 3D. Documentación de Santa María de Iguacel (XI d.C.) mediante láser escáner 3D.

2010 ◽  
Vol 1 (1) ◽  
pp. 63 ◽  
Author(s):  
Jorge Angás Pajas ◽  
Alfredo Serreta Oliván
Keyword(s):  
Laser Scanning ◽  
Methodological Approach ◽  
Geometric Analysis ◽  
Laser Scanner ◽  
3D Laser Scanning ◽  
Mass Storage ◽  
Archaeological Heritage ◽  
Web 3D ◽  
Reliable Representation ◽  
Santa Maria

<p>Nowadays, the introduction of the pioneer laser scanning 3D technology has turn into a revolution in the methods used and results obtained in the documentation and geometric analysis of Archaeological Heritage, through the collection and mass storage of data generated by a laser scanner. The documentation of the Cultural Heritage through the 3D laser scanning technology is a key element in the reliable representation of a monument. As well as forming an exact geometric documentary file, which is totally diachronically reproducible, it serves as a control tool for monitoring any type of change in the structure of the monument. Using a methodological approach, this work is focused on the creation of a 3D web server which will process the 3D file in a more agile way, and through html it will arrive to a wider and more diverse public.</p>

scholarly journals Approximation Of Scours Using Terrestrial 3D Laser Scanning

2015 ◽  
Vol 5 (1) ◽  
pp. 31-36
Author(s):  
Andreea Florina Jocea ◽  
E. G. Crăciun ◽  
A. Anton
Keyword(s):  
Experimental Study ◽  
Mathematical Models ◽  
Present Article ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Bridge Pier ◽  
Design Stage ◽  
Terrestrial Laser Scanner ◽  
3D Laser Scanning ◽  
Over Time

Abstract In designing artwork as bridges, hydraulic calculations have a very important role due to the fact that they are behind their sizing. Bridge designer must therefore possess knowledge of hydrology, hydraulics of bridges and river banks regularization. A problem that arises during the design stage of bridges is the scour phenomenon surrounding bridge pier. Over time, there have been conducted a number of studies which led to the provision of a plurality of mathematical models that are intended scour prediction. In the present article we will present an experimental study to determine the bed profile and measurement of scours products around a pier bridge using 3D terrestrial laser scanner.

Surface Reconstruction Based on the 3D Laser Scanner

2012 ◽  
Vol 215-216 ◽  
pp. 656-659
Author(s):  
Le Yang Chen
Keyword(s):  
Reverse Engineering ◽  
Surface Reconstruction ◽  
Point Cloud ◽  
Laser Scanning ◽  
Laser Scanner ◽  
3D Laser Scanning ◽  
Cloud Processing ◽  
Point Cloud Processing ◽  
Key Technologies ◽  
Rapid Scanning

3D laser scanning is one of the key technologies of reverse engineering. Digital point cloud is produced by the rapid scanning technology. Some technology about reverse engineering is introduced in this thesis. The curved surface can be generated by the point cloud processing, when the point cloud can be processed by the software called Geomagic Studio.

scholarly journals Reference Charts for Neonatal Cranial Volume Based on 3D Laser Scanning to Monitor Head Growth

2021 ◽  
Vol 9 ◽  
Author(s):  
Marijn Jorien Vermeulen ◽  
Wolfram Burkhardt ◽  
Anne Fritze ◽  
Jorine Roelants ◽  
Lars Mense ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Newborn Infants ◽  
Neurodevelopmental Outcome ◽  
University Hospital ◽  
3D Laser Scanning ◽  
Brain Growth ◽  
Volume Data ◽  
Cross Sectional ◽  
Female Birth

Background: Postnatal brain growth is an important predictor of neurodevelopmental outcome in preterm infants. A new reliable proxy for brain volume is cranial volume, which can be measured routinely by 3-D laser scanning. The aim of this study was to develop reference charts for normal cranial volume in newborn infants at different gestational ages starting from late preterm for both sexes.Methods: Cross-sectional cohort study in a German university hospital, including singleton, clinically stable, neonates born after 34 weeks of gestation. Cranial volume was measured in the first week of life by a validated 3-D laser scanner. Cranial volume data was modeled to calculate percentile values by gestational age and birth weight and to develop cranial volume reference charts for girls and boys separately.Results: Of the 1,703 included infants, 846 (50%) were female. Birth weights ranged from 1,370 to 4,830 grams (median 3,370). Median cranial volume ranged from 320 [interquartile range (IQR) 294–347] ml at 34 weeks to 469 [IQR 442–496] ml at 42 weeks and was higher in boys than in girls.Conclusions: This study presents the first reference charts of cranial volume which can be used in clinical practice to monitor brain growth between 34 and 42 weeks gestation in infants.

Application of 3D Laser Scanner in Surveying of Traditional Architecture: Case Study on Surveying Practice of Hangzhou Haichao Temple

2013 ◽  
Vol 353-356 ◽  
pp. 3405-3409
Author(s):  
Li Shen ◽  
Hui Xin Tai ◽  
Tong Yuan Ni
Keyword(s):  
Wall Thickness ◽  
Outer Surface ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Point Clouds ◽  
3D Laser Scanning ◽  
Traditional Architecture ◽  
Effective Measure ◽  
Survey Approach

As a burgeoning survey approach, 3D laser scanning is currently more and more applied in traditional architecture survey. In the surveying practice for Tianwang Hall of Hangzhou Haichao Temple, by skillfully setting the targets, we efficiently and accurately collected relevant surveying data with 3D laser scanner. On this basis, utilizing jointed point clouds on inner and outer surface, we successfully obtained wall thickness, roof depth, and other data that could not be precisely captured through traditional surveying measures. Moreover, the width, height and size of main beams were also easily and accurately acquired. So far, 3D laser scanning has become a very effective measure in traditional architecture surveying.

3D Laser Scanner Techniques

2011 ◽  
pp. 500-527
Author(s):  
Mercedes Farjas ◽  
Jesús Martinez-Frias ◽  
Jose María Hierro
Keyword(s):  
Morphological Study ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Laser Scanner ◽  
3D Laser Scanning ◽  
The Subject ◽  
First Time ◽  
Non Destructive ◽  
Arbitrary Objects ◽  
Scanning Systems

The use of 3D scanning systems for acquiring and analyzing the external shape features of arbitrary objects has different applications in different cultural, scientific, and technological fields. In this work, 3D laser scanning techniques are used, for the first time, to our knowledge, as a novel and non-destructive application for the morphological study of meteorite impact rocks. The subject of the study was a rock displaying impact textures and associated with the Karikkoselkä impact crater (Finland) (Lehtinen et al. 1996). This methodology permitted: (1) a computerized three-dimensional modelling to be carried out on the bulk impact-related rock; (2) other more specific characterizations to be performed, such as detailed topographic studies of its surface impact features; (3) some physical properties of the rock to be determined (volume); (4) the shatter cone impact texture to be completed with a realistic estimation of its convergence angle; and (5) a broad demonstration of the significance and effectiveness of 3D laser scanning techniques as a complementary tool for the study of this type of meteoritic impact-related rocks.

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