Application Analysis of Various Types of 3D Laser Scanner in Engineering Deformation Monitoring Field

2021 ◽  
Vol 3 (4) ◽  
pp. 171-176
Author(s):  
Yang Yan
Keyword(s):  
Laser Scanner ◽  
Deformation Monitoring ◽  
Application Analysis

Robust external calibration of terrestrial laser scanner and digital camera for structural monitoring

2019 ◽  
Vol 13 (2) ◽  
pp. 105-134 ◽  
Author(s):  
Mohammad Omidalizarandi ◽  
Boris Kargoll ◽  
Jens-André Paffenholz ◽  
Ingo Neumann
Keyword(s):  
Em Algorithm ◽  
Laser Scanner ◽  
Digital Camera ◽  
Point Clouds ◽  
Deformation Monitoring ◽  
Deformation Analysis ◽  
Terrestrial Laser Scanner ◽  
External Calibration ◽  
3D Point Clouds ◽  
Calibration Parameters

Abstract In the last two decades, the integration of a terrestrial laser scanner (TLS) and digital photogrammetry, besides other sensors integration, has received considerable attention for deformation monitoring of natural or man-made structures. Typically, a TLS is used for an area-based deformation analysis. A high-resolution digital camera may be attached on top of the TLS to increase the accuracy and completeness of deformation analysis by optimally combining points or line features extracted both from three-dimensional (3D) point clouds and captured images at different epochs of time. For this purpose, the external calibration parameters between the TLS and digital camera needs to be determined precisely. The camera calibration and internal TLS calibration are commonly carried out in advance in the laboratory environments. The focus of this research is to highly accurately and robustly estimate the external calibration parameters between the fused sensors using signalised target points. The observables are the image measurements, the 3D point clouds, and the horizontal angle reading of a TLS. In addition, laser tracker observations are used for the purpose of validation. The functional models are determined based on the space resection in photogrammetry using the collinearity condition equations, the 3D Helmert transformation and the constraint equation, which are solved in a rigorous bundle adjustment procedure. Three different adjustment procedures are developed and implemented: (1) an expectation maximization (EM) algorithm to solve a Gauss-Helmert model (GHM) with grouped t-distributed random deviations, (2) a novel EM algorithm to solve a corresponding quasi-Gauss-Markov model (qGMM) with t-distributed pseudo-misclosures, and (3) a classical least-squares procedure to solve the GHM with variance components and outlier removal. The comparison of the results demonstrates the precise, reliable, accurate and robust estimation of the parameters in particular by the second and third procedures in comparison to the first one. In addition, the results show that the second procedure is computationally more efficient than the other two.

Automatic Deformation Acquisition Using Terrestrial Laser Scanner

2011 ◽  
Vol 90-93 ◽  
pp. 2811-2817 ◽  
Author(s):  
Bao Xing Zhou ◽  
Jian Ping Yue ◽  
Ke Yong Jia
Keyword(s):  
Laser Scanning ◽  
High Spatial Resolution ◽  
Laser Scanner ◽  
Deformation Monitoring ◽  
Nurbs Surface ◽  
Surface Modelling ◽  
Object A ◽  
3D Information ◽  
Geodetic Surveying ◽  
Acquisition Method

Deformation monitoring is typically undertaken using spare, point-wise geodetic surveying techniques, such as total station or GPS. Deformation monitoring using terrestrial laser scanning is gaining considerable attention mainly due to the high spatial resolution of the acquired data. It can provide dense 3D information of the surface of an object. A disadvantage of the technique may be the difficulty to assess some fixed benchmarks on the surface of the deforming area, unless they are special targets that can be recognised by the accompanying software. To solve this problem, a new automatic deformation acquisition method based on nurbs surface was presented. The paper discusses methods of nurbs surface modelling implemented for deformation monitoring and approaches used to measure the deformation from surfaces. Finally, applications involving the use of laser scanning in bridge are presented.

scholarly journals Freeze/Thaw-Induced Deformation Monitoring and Assessment of the Slope in Permafrost Based on Terrestrial Laser Scanner and GNSS

2017 ◽  
Vol 9 (3) ◽  
pp. 198 ◽  
Author(s):  
Lihui Luo ◽  
Wei Ma ◽  
Zhongqiong Zhang ◽  
Yanli Zhuang ◽  
Yaonan Zhang ◽  
...  
Keyword(s):  
Laser Scanner ◽  
Deformation Monitoring ◽  
Terrestrial Laser Scanner ◽  
Freeze Thaw

scholarly journals 3D TEXTURED MODELLING OF BOTH EXTERIOR AND INTERIOR OF KOREAN STYLED ARCHITECTURES

2017 ◽  
Vol XLII-2/W5 ◽  
pp. 439-442 ◽  
Author(s):  
J.-D. Lee ◽  
K.-J. Bhang ◽  
W. Schuhr
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
3D Modelling ◽  
Deformation Monitoring ◽  
Terrestrial Laser Scanner ◽  
Cultural Assets ◽  
Modelling Procedure ◽  
Digital Documentation ◽  
Documentation Tool ◽  
Safety Diagnosis

This paper describes 3D modelling procedure of two Korean styled architectures which were performed through a series of processing from data acquired with the terrestrial laser scanner. These two case projects illustate the use of terrestrial laser scanner as a digital documentation tool for management, conservation and restoration of the cultural assets. We showed an approach to automate reconstruction of both the outside and inside models of a building from laser scanning data. Laser scanning technology is much more efficient than existing photogrammetry in measuring shape and constructing spatial database for preservation and restoration of cultural assets as well as for deformation monitoring and safety diagnosis of structures.

New Technology of Surveying and Mapping in the Application of Deformation Monitoring

2013 ◽  
Vol 333-335 ◽  
pp. 1492-1495 ◽  
Author(s):  
Yan Ping Feng ◽  
Tian Zhu Zheng
Keyword(s):  
Real Time ◽  
Laser Scanning ◽  
New Technology ◽  
Three Dimensional ◽  
Laser Scanner ◽  
High Accuracy ◽  
Deformation Monitoring ◽  
High Density ◽  
Monitoring Methods ◽  
Engineering Measurement

Deformation monitoring is one of the engineering measurement tasks. Three-dimensional laser scanning technology as a new technology has developed in recent years. With its high accuracy, high density, real-time and initiative, it wins great favor of people in the industry. Its unique technical advantages and characteristics make it widely used in many fields. The article summarizes the application of deformation monitoring methods and discusses the characteristics of ground 3D laser scanner, its working principles, its application in the field of deformation monitoring and some problems that should be considered.

scholarly journals Development of Laser Scanner for Full Cross-Sectional Deformation Monitoring of Underground Gateroads

2017 ◽  
Author(s):  
Qianlong Yang ◽  
Zhenyu Zhang ◽  
Xiaoqian Liu ◽  
Shuqi Ma
Keyword(s):  
Laser Beam ◽  
Fine Particles ◽  
Incidence Angle ◽  
Coal Dust ◽  
Laser Scanner ◽  
Measurement Data ◽  
Measuring Method ◽  
Deformation Monitoring ◽  
Laser Sensor ◽  
Cross Sectional

The deformation of underground gateroads tends to be asymmetric and complex. Traditional instrumentation fails to accurately and conveniently monitor the full cross-sectional deformation of underground gateroads. Here, a full cross-sectional laser scanner was developed together with a visualization software package. The developed system used polar coordinate measuring method and the full cross-sectional measurement was realized by 360° rotation of laser sensor driven by an electrical motor. Later on, the potential impact of gateroad wall flatness, roughness and geometrical profile as well as coal dust environment on the performance of the developed laser scanner were evaluated. The studies show that a high-level flatness is favorable in application of the developed full cross-sectional deformation monitoring system. For a smooth surface of gateroad, the sensor cannot receive reflected light when the incidence angle of laser beam is large, causing data loss. Conversely, the roughness surface shows its priority as the diffuse reflection light can be received by the sensor. With regards to the coal dust in measurement environment, the fine particles of floating coal dust in the air can lead to the loss of measurement data to some certain due to scattering of laser beam.

scholarly journals COMPARISON OF TARGET- AND MUTUAL INFORMATON BASED CALIBRATION OF TERRESTRIAL LASER SCANNER AND DIGITAL CAMERA FOR DEFORMATION MONITORING

2015 ◽  
Vol XL-1-W5 ◽  
pp. 559-564 ◽  
Author(s):  
M. Omidalizarandi ◽  
I. Neumann
Keyword(s):  
Laser Scanner ◽  
Digital Camera ◽  
Deformation Monitoring ◽  
Sensor System ◽  
Deformation Analysis ◽  
Accurate Estimation ◽  
Terrestrial Laser Scanner ◽  
Ongoing Research ◽  
Extrinsic Calibration ◽  
Advantages And Disadvantages

In the current state-of-the-art, geodetic deformation analysis of natural and artificial objects (e.g. dams, bridges,...) is an ongoing research in both static and kinematic mode and has received considerable interest by researchers and geodetic engineers. In this work, due to increasing the accuracy of geodetic deformation analysis, a terrestrial laser scanner (TLS; here the Zoller+Fröhlich IMAGER 5006) and a high resolution digital camera (Nikon D750) are integrated to complementarily benefit from each other. In order to optimally combine the acquired data of the hybrid sensor system, a highly accurate estimation of the extrinsic calibration parameters between TLS and digital camera is a vital preliminary step. Thus, the calibration of the aforementioned hybrid sensor system can be separated into three single calibrations: calibration of the camera, calibration of the TLS and extrinsic calibration between TLS and digital camera. In this research, we focus on highly accurate estimating extrinsic parameters between fused sensors and target- and targetless (mutual information) based methods are applied. In target-based calibration, different types of observations (image coordinates, TLS measurements and laser tracker measurements for validation) are utilized and variance component estimation is applied to optimally assign adequate weights to the observations. Space resection bundle adjustment based on the collinearity equations is solved using Gauss-Markov and Gauss-Helmert model. Statistical tests are performed to discard outliers and large residuals in the adjustment procedure. At the end, the two aforementioned approaches are compared and advantages and disadvantages of them are investigated and numerical results are presented and discussed.

Turtle Mountain Deformation Monitoring 2008-2011

GEOMATICA ◽  
2013 ◽  
Vol 67 (1) ◽  
pp. 21-30
Author(s):  
Daniel Lo ◽  
Axel Ebeling ◽  
William F. (Bill) Teskey ◽  
Robert Radovanovic
Keyword(s):  
Least Squares ◽  
High Precision ◽  
Precise Point Positioning ◽  
Laser Scanner ◽  
Deformation Monitoring ◽  
Terrestrial Laser Scanner ◽  
Network Adjustment ◽  
Total Station ◽  
Gnss Receivers ◽  
Point Positioning

Deformation monitoring was carried out in two epochs on Turtle Mountain, Alberta using a high-precision total station, a terrestrial laser scanner, and geodetic quality GNSS receivers. From the total station observations, coordinates were computed for seven signalized target points in a least-squares network adjustment. Then, a deformation analysis using a multi-parameter transformation was performed to derive movements between epochs. Precise point positioning was performed using GNSS receivers at another set of target points and control points, with another least squares network adjustment performed on this network. Terrestrial laser scanning was performed in the saddle region, with registration via an iterative closest point algorithm performed on the two point clouds to determine movement between the two epochs. Movement into the saddle from North Peak and South Peak was detected by analysis of 2008 and 2011 high-precision total station observations. This movement was also detected by analysis of 2008 and 2011 terrestrial laser scanner observations. Movement of 10 of 18 target points on Turtle Mountain was detected by analysis of 2010 and 2011 precise point positioning observations. Backward or sideways tilting with little or no downhill translation occurred at 6 points, while downhill translation and/or forward tilting occurred at 4 points.

Application Analysis of Structure Deformation Monitoring Prediction Methods

2010 ◽  
Vol 163-167 ◽  
pp. 2674-2677
Author(s):  
Li Ting Zhang ◽  
Hao Zhang
Keyword(s):  
Prediction Models ◽  
Prediction Method ◽  
Information Model ◽  
Deformation Monitoring ◽  
Dynamic Monitoring ◽  
Prediction Methods ◽  
Structure Deformation ◽  
New Information ◽  
Application Analysis ◽  
Scientific Prediction

Nowadays structure construction and monitoring, hazard forecasting depends more and more on scientific prediction methods. This paper focus on prediction method, which based on GM(1,1) model of Gary Theory. With a set of dynamic monitoring data from one structure, we introduce the modeling method of old information model, new information model and equal dimension new information model. An analysis of these prediction models reliability is performed to compare these models. The result of these models can predict the structure settlement proved that a suitable prediction method could provide help to structure safety and reduce unnecessary lost.

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