A three-dimensional measuring system based on 2D laser displacement sensor

2014 ◽  
Author(s):  
Sulun Jiang ◽  
Yuegang Fu ◽  
Wangbin Zhu ◽  
Yingwei Zhang ◽  
Weichen Wang
Keyword(s):  
Three Dimensional ◽  
Measuring System ◽  
Displacement Sensor ◽  
Laser Displacement Sensor

Profile Measurement of a Curved Workpiece by the Fuzzy Control of Sensor Positioning

1999 ◽  
Author(s):  
Masatake Shiraishi ◽  
Gongjun Yang
Keyword(s):  
Fuzzy Control ◽  
Control Algorithm ◽  
Experimental Results ◽  
Measuring System ◽  
Displacement Sensor ◽  
Profile Measurement ◽  
Laser Displacement Sensor ◽  
Inclination Angles ◽  
Fuzzy Control Algorithm ◽  
Sensor Positioning

Abstract A laser displacement sensor which has a resolution of 0.5 μm was used to determine the measurement of a curved workpiece profile in turning. This sensor is attached to a specially designed stage and is operated by three motors which are controlled by a fuzzy control algorithm. The experimental results show that the measuring system can be applied to workpieces having inclination angles of up to around 45°. The proposed measuring system has a practical measuring accuracy to within ten micrometers.

Design of Measuring System for Conical Shell Gluing Platform and Analysis of Factors Influencing Measurement

2017 ◽  
Vol 872 ◽  
pp. 373-377
Author(s):  
Li Chao Liu ◽  
Xiang Long Zhu ◽  
Zhi Gang Dong ◽  
Ren Ke Kang
Keyword(s):  
Data Acquisition ◽  
Cross Sections ◽  
Conical Shell ◽  
Incident Angle ◽  
Measuring Method ◽  
Measuring System ◽  
Displacement Sensor ◽  
Laser Displacement Sensor ◽  
Before And After ◽  
Open Cnc System

As a cover to prevent the inside system from being destroyed, conical shell is widely used in national defense and meteorological fields. Radial runouts at specific cross sections of conical shell need to be measured before and after gluing for coaxiality requirement between conical shell and connecting ring. So a measuring system of vertical gluing platform was designed. Noncontact laser displacement sensor was adopted in the measuring system for advantages of quick data acquisition, high measuring accuracy and no surface scratch. Compared with traditional measuring method by a dial indicator, laser displacement sensor is more appropriate to carry out the measurement on the surface of conical shell. An open CNC system was developed for the measurement. It was based on industry personal computer (IPC) which and took motion control board and data acquisition board as its core. Experiments were conducted on the designed measuring system to find out the factors which influence measuring results. Measuring data showed that measuring results appeared to be a parabolic distribution in the working range of the sensor and the symmetry axis of the parabola was at the middle position. The variation of incident angle has no obvious influence on measuring results.

scholarly journals A Fast and On-Machine Measuring System Using the Laser Displacement Sensor for the Contour Parameters of the Drill Pipe Thread

Sensors ◽  
2018 ◽  
Vol 18 (4) ◽  
pp. 1192 ◽  
Author(s):  
Zhixu Dong ◽  
Xingwei Sun ◽  
Changzheng Chen ◽  
Mengnan Sun
Keyword(s):  
Drill Pipe ◽  
Measuring System ◽  
Displacement Sensor ◽  
Laser Displacement Sensor

Design and calibration of a three-dimensional localization system for automatic measurement of long and thin tube based on camera and laser displacement sensor

2019 ◽  
pp. 095440621989230
Author(s):  
Ruifeng Li ◽  
Jinlei Zhuang ◽  
Yunfeng Gao ◽  
Chuqing Cao ◽  
Ke Wang
Keyword(s):  
Three Dimensional ◽  
Automatic Measurement ◽  
High Accuracy ◽  
Displacement Sensor ◽  
Depth Information ◽  
Laser Displacement Sensor ◽  
Location Error ◽  
Localization System ◽  
Thin Tube ◽  
Key Points

An integrated system consisting of robot and laser scanner is considered as a promising alternative measurement device for three-dimensional tube which is long and thin. A key to achieving automatic measurement is to locate tube accurately and robustly, which is precondition for scanning path planning. Thus, a novel three-dimensional localization system consisting of camera and laser displacement senor is proposed. When fixed on robot, the camera can search tube quickly in large view and the laser displacement sensor obtains depth information of key points. Measurement principles are presented firstly, including four main steps: camera shooting, key points extraction, laser displacement sensor shooting, and coordinate calculation. Then, the location error influenced by parameters of camera model and laser displacement sensor is analyzed and illustrated by a specific camera and laser displacement sensor. Furthermore, a scan strategy is proposed for quite thin tube localization. Location error caused by perspective is also analyzed and a compensation method is proposed for decreasing the error. Additionally, a sensor transformation calibration method is presented for identifying the relationship between camera and laser displacement sensor, which is verified with high accuracy by calibration experiments. A contrast experiment of a cylinder bar localization shows that the maximum location error of the camera and laser displacement sensor is no more than 3.5 mm, which is only one-eighth of that of Kinect sensor. The mean and maximum location errors are within 2 mm and 3 mm when locating a car brake and fuel tube with about 1300 mm long, indicating high accuracy and good robustness of designed localization system.

Development of Non-Contact Online Measuring System for Middle-Convex and Varying Ellipse Piston

2013 ◽  
Vol 753-755 ◽  
pp. 2282-2285
Author(s):  
Dong Zheng ◽  
Hui Xing Zhou ◽  
Han Wu ◽  
Chao Yang Zhang
Keyword(s):  
Digital Signal Processor ◽  
Digital Signal ◽  
Least Square Method ◽  
High Accuracy ◽  
Measured Data ◽  
Least Square ◽  
Measuring System ◽  
Displacement Sensor ◽  
Contour Error ◽  
Laser Displacement Sensor

A non-contact online measuring system is developed to measure the contour error of the middle-convex and varying ellipse piston. A high accuracy laser displacement sensor is used to measure the elliptical profiles of the piston, and a measuring collector is designed based on digital signal processor (DSP) TMS320F28335 to ensure strict correspondence between the angles and the radii data of the sampling points. The measured data is analyzed with least square method to calculate the contour error of the pistons cross section. The reliability of the measuring system is proved by experiment.

Development of Off-Line-Programming System for Automatic Propeller Grinding Robot System

2007 ◽  
Author(s):  
C. W. Jung ◽  
Y. S. Lee ◽  
J. G. Kim ◽  
D. J. Jeon ◽  
J. O. Kim ◽  
...  
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Displacement Sensor ◽  
Robot Motion ◽  
Grinding Process ◽  
Programming System ◽  
Curved Surfaces ◽  
Laser Displacement Sensor ◽  
Robot System

An off-line programming system (OLP) for the grinding robot has been developed and applied to manufacturing a large scale commercial ship’s propellers. It is necessary to develop the off-line programming system which generates robot motion programs for sensing and grinding the curved surfaces of propeller. The robot performs a sensing process with a laser displacement sensor. Three dimensional surfaces of propeller are generated by the off-line programming system after sensing. The grinding program for the robot is generated from the measured surface in the off-line programming system. After then, the robot performs grinding process automatically.

scholarly journals Measurement of Agglomerates Shape Parameters with Threedimensional Reconstruction Based on a Laser Displacement Sensor

2013 ◽  
Vol 20 (3) ◽  
pp. 407-418 ◽  
Author(s):  
J. P. Zavala De Paz ◽  
E. Castillo Castañeda ◽  
J. Soto Herrera ◽  
C. Turchiuli
Keyword(s):  
Degrees Of Freedom ◽  
Milk Powder ◽  
Three Dimensional ◽  
Displacement Sensor ◽  
Experimental Result ◽  
Reconstruction Technique ◽  
Positioning System ◽  
Laser Displacement Sensor ◽  
Shape Parameters ◽  
Particle Volume

Abstract The agglomeration of particles is a process that modifies the physical properties of a product originally manufactured as a powder. During milk powder agglomeration of fluidized bed, resulting agglomerates are sufficiently porous to improve the solubility of the final product but, at the same time, their rigidity decreases and agglomerates can be destroyed during packing. The porosity and rigidity properties depend on both the volume and shape characteristics of the agglomerates. This paper presents a three-dimensional reconstruction technique based on a laser displacement sensor (LDS) applied to characterize milk agglomerates. This technique allows three-dimensional scanning to estimate particle volume and extract shape parameters such as: sphericity, elongation and flatness ratio, shape factor and aspect ratio. This technique was implemented using a mechatronic device with two degrees of freedom. The device is composed of an angular positioning system to rotate the agglomerate and a linear positioning system to displace the LDS. Experimental result allows agglomerates classification according to shape parameters

Research and Design of Laser Accurate Displacement Measurement System

2011 ◽  
Vol 301-303 ◽  
pp. 1289-1292
Author(s):  
Xiao Gang Wang ◽  
Yue Wei Bai ◽  
Kai Liu
Keyword(s):  
Measurement System ◽  
Electric Displacement ◽  
Three Dimensional ◽  
Measurement Data ◽  
Displacement Measurement ◽  
Displacement Sensor ◽  
Laser Displacement Sensor ◽  
Servo Motor ◽  
Wide Range ◽  
Research And Design

Laser displacement sensor(LDS) displacement measurement is a non-contact measurement with more precision and a wide range of applications.。In this paper, a laser accurate displacement measurement system based on LDS and three-dimensional linear-servomotor-driven actuators (3D LSDA) is presented. The 3D LSDA moving system is composed of linear servo motor, precision movable liner mechanism and servo machine. It is driven to move the noncontact laser displacement sensor to scan surfaces through the three-dimensional electric displacement platform, and then the measurement data is processed. The displacement sensor resolution is 2μm; each dimensional electric displacement platform repeated positioning accuracy is higher than 5μm.

Development of a Visual Monitoring System for Deformation Measuring of Welded Members and its Application

2008 ◽  
Vol 580-582 ◽  
pp. 557-560 ◽  
Author(s):  
J.G. Han ◽  
Kyong Ho Chang ◽  
Gab Chul Jang ◽  
K.K. Hong ◽  
Sam Deok Cho ◽  
...  
Keyword(s):  
Monitoring System ◽  
Three Dimensional ◽  
Measuring Method ◽  
Welding Residual Stress ◽  
Measuring System ◽  
Visual Monitoring ◽  
Test Error ◽  
Steel Members ◽  
Loading Tests ◽  
Visual Monitoring System

Recently, in the loading tests for steel members, the deformation value is measured by calculating a distance of both cross-heads. This measuring method encounters a test error due to various environmental factors, such as initial slip, etc.. Especially, in the case of welded members, the non-uniform deformation behavior in welded joints is observed because of the effect of welding residual stress and weld metal. This is mainly responsible for a test error and a loss of the reliability for used test instruments. Therefore, to improve the accuracy and the applicability of measuring system, it is necessary to employ a visual monitoring system which can accurately measure the local and overall deformation of welded members. In this paper, to accurately measure a deformation of welded members, a visual monitoring system (VMS) was developed by using three-dimensional digital photogrammetry. The VMS was applied to the loading tests of a welded member. The accuracy and the applicability of VMS was verified by comparing to the deformation value measured by a test instrument (MTS-810). The characteristics of the behavior near a welded joint were investigated by using VMS.

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