scholarly journals A CMM-Based Method of Control Point Position Calibration for Light Pen Coordinate Measuring System

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5592
Author(s):  
Sen Wang ◽  
Shugui Liu ◽  
Qing Mao
Keyword(s):  
Control Point ◽  
Coordinate Measuring Machine ◽  
High Accuracy ◽  
Measuring System ◽  
Mathematical Treatment ◽  
Control Points ◽  
Point Position ◽  
Measuring Machine ◽  
Position Calibration ◽  
Light Pen

A light pen coordinate measuring system (LPCMS) is a kind of vision-based portable coordinate measuring technique. It implements coordinate measurement by analyzing the image of a light pen, which has several control points and a probe. The relative positions of control points need to be determined before measurement and serve as the measuring basis in LPCMS. How to accurately calibrate the relative positions of control points is the most important issue in system calibration. In this paper, a new method of control point position calibration based on a traditional coordinate measuring machine (CMM) is proposed. A light pen is fastened to the measuring arm of a CMM and performs accurate translational movement driven by the CMM. A camera is used to capture the images of control points at different positions, and the corresponding readings of the CMM are recorded at the same time. By establishing a separate coordinate system for each control point, the relative positions of the control points can be transformed to the differences of a series of translation vectors. Experiments show that the calibration repeatability of control point positions can reach 10 μm and the standard deviation of measurement of the whole LPCMS can reach 30 μm. A CMM is used to generate accurate translation, which provides a high accuracy basis of calibration. Through certain mathematical treatment, tremendous data acquired by moving the light pen to tens of thousands of different positions can be processed in a simple way, which can reduce the influence of random error. Therefore, the proposed method provides a high-accuracy solution of control point position calibration for LPCMS.

scholarly journals Control Point Position Calibration for Light Pen Coordinate Measuring System

2020 ◽  
Vol 206 ◽  
pp. 03026
Author(s):  
Sen Wang ◽  
Shugui Liu ◽  
Qing Mao
Keyword(s):  
Control Point ◽  
Three Dimensional ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Point Problem ◽  
Control Points ◽  
Calibration Methods ◽  
Measuring Machine ◽  
Position Calibration ◽  
Light Pen

Light pen coordinate measuring system is a kind of vision-based portable coordinate measuring technique. It implements coordinate measuring by analyzing the image of light pen, which has several control points. With the relative positons of the control points determined and the pixel coordinates of their image points acquired by image processing, the posture of light pen can be obtained by solving perspective- n-point problem. Therefore, the control point positons serve as the measuring basis of the whole system. However, the accuracy of existing calibration methods is not satisfactory. In this paper, a new method of control point positon calibration, which utilizes traditional coordinate measuring machine, is proposed. The light pen is fasten to the measuring arm of a coordinate measuring machine and moves along a three dimensional grid route driven by the machine. A stationary camera is located in front of the machine to capture the image of light pen at each node of the route. For each control point, an individual coordinate system is established. Then the relative positions of control points can be transformed into the differences of a series of translation vectors. Experiments show that, with the proposed method, the accuracy of light pen coordinate measuring system can reach 30m within 10 meters.

Study of Large Scale Measurement Method Based on Leapfrog Principle

2011 ◽  
Vol 130-134 ◽  
pp. 1560-1563
Author(s):  
Long Jiang Zheng ◽  
Xue Li ◽  
Ling Ling Qin ◽  
Hong Bin Chen ◽  
Xue Gao ◽  
...  
Keyword(s):  
Coordinate Transformation ◽  
Large Scale ◽  
Manufacturing Industry ◽  
Coordinate Measuring Machine ◽  
Measuring Method ◽  
Measuring System ◽  
Wide Range ◽  
General Coordinate Transformation ◽  
Measuring Machine ◽  
The Mathematical Model

At present，large scale and space coordinates measuring system with wide-range and high-precision has been widely used in modern manufacturing industry. In this paper, large scale measuring method based on leapfrog principle of flexible three coordinate measuring machine is described. The mathematical model of coordinate transformation is built and the general coordinate transformation formula after number of times leapfrogging is derived. The best positioning and each step of leapfrog are given.

scholarly journals The accuracy of calculating form deviations of selected free-form surfaces

Mechanik ◽  
2017 ◽  
Vol 90 (11) ◽  
pp. 1035-1037
Author(s):  
Marek Magdziak ◽  
Andrzej Kawalec
Keyword(s):  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Free Form ◽  
Experimental Investigations ◽  
Simulation Studies ◽  
Numerical Investigations ◽  
Measuring Machine ◽  
Coordinate Measurements ◽  
Simulation Results ◽  
Free Form Surfaces

The possible reason for the incorrect form deviations calculated using an algorithm available in the selected software of coordinate measuring machine was identified. This method is available in the Calypso software and it is based on local deviations calculated at nominal points. The analysis was made for the selected examples of free-form surfaces. There are presented the results of numerical investigations based on simulations of coordinate measurements of selected object. The measured points were generated with assumed values of scatter in relation to the nominal profiles of the analyzed product. The simulations were made using 3 selected methods for computing the form deviations and various distances between the measured points. In order to verify the results of simulation studies there were made experimental investigations. The experimental investigations were done using selected coordinate measuring system and chosen measurement parameters. The results of performed measurements confirm the simulation results.

A Multi-Probe Measurement Method to Evaluate the Yaw and Straightness Errors of XY Stage on High Precision CMM

2010 ◽  
Vol 447-448 ◽  
pp. 590-594 ◽  
Author(s):  
Ping Yang ◽  
Shusaku Shibata ◽  
Satoru Takahashi ◽  
Kiyoshi Takamasu ◽  
Osamu Sato ◽  
...  
Keyword(s):  
High Precision ◽  
Coordinate Measuring Machine ◽  
Simultaneous Equation ◽  
High Accuracy ◽  
Probe Measurement ◽  
Probe Method ◽  
Measuring Machine ◽  
Simulation Results ◽  
Straightness Error ◽  
Laser Interferometers

To develop a high precision Micro Coordinate Measuring Machine (Micro-CMM), it is important to evaluate an X-Y stage on the Micro-CMM. A precision multi-probe measurement system has been designed and developed for simultaneously measuring the yaw and straightness errors of the X-Y stage. In the system, an autocollimator measures the yaw error of the stage, and two laser interferometers measure the profile of a standard mirror which is fixed on the X-Y stage. The straightness error is reconstructed by the application of simultaneous equation and least-squares methods, and the uncertainty associated with the multi-probe method is simulated. When the interval of the laser interferometers equals 10 mm, the standard deviation of multi-probe method using the high accuracy autocollimator and the laser interferometers is about 10 nm. The simulation results satisfy our purpose for the uncertainty of 50 nm, and practical considerations are discussed.

Design and Development of a Novel Coordinate Measuring Machine with 3-PUU Parallel Mechanism

2014 ◽  
Vol 625 ◽  
pp. 34-41
Author(s):  
Song Yuan Li ◽  
Peng Hao Hu
Keyword(s):  
Parallel Mechanism ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Kinematics Model ◽  
Measuring Accuracy ◽  
Measuring Machine ◽  
Motion Characteristics ◽  
Principle Of Maximum ◽  
Direct Kinematics ◽  
Measuring Space

A bran-new style coordinate measuring system with 3-PUU parallel mechanism and its advantages was proposed which could realize 3D measurement with only one linear grating and two precision guides. Firstly, measuring space with a 0.05mm error of structure parameter as target was explored based on 6 bars direct kinematics model, workspace and error model, and then the principle of maximum measuring space was presented to elaborate the relationship between measuring space and length of bar. Then in order to enlarge the scale of measuring space of Coordinate Measuring Machine (CMM), improve the measuring accuracy and flexibility of CMM, the key dimensions and positional parameters of CMM were optimization designed according to the direct kinematics model and the principle of maximum measuring space. Finally the deformation of key components was processed by Finite Element Method (FEM) according to the motion characteristics and parameters of the new CMM prototype, so that the affect of deformation to measuring accuracy can be controlled and decreased. Results are shown that the measuring space of CMM is 1100mm in x axis, 535mm in y axis, 426mm in z axis; deformation of beam is the main reason to influence the measuring accuracy and should be offset after calibration.

scholarly journals The Impact of Control Point Dispersion on Measurement Accuracy in a New Type of Light-pen Coordinate Measuring System

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Dongri Shan ◽  
Xiaodong Bi ◽  
Xiaofang Wang ◽  
Peng Zhang ◽  
Zhoufang Xu ◽  
...  
Keyword(s):  
Measurement Accuracy ◽  
Control Point ◽  
Measuring System ◽  
New Type ◽  
The Impact ◽  
Light Pen

scholarly journals Comparison of measurement using optical measuring systems and coordinate measuring machine

2020 ◽  
Vol 26 (2) ◽  
pp. 35-41
Author(s):  
Milan Simonović ◽  
Dragan Lazarević ◽  
Marko Simonović ◽  
Bogdan Nedić
Keyword(s):  
Coordinate Measuring Machine ◽  
Complex Configuration ◽  
Measuring System ◽  
Measuring Systems ◽  
Measurement Result ◽  
Optical Measuring ◽  
Measurement Results ◽  
Final Measurement ◽  
Measuring Machine ◽  
The Way

The paper presents the results of measuring the gearbox housing with the ATOS optical measuring system, the TRITOP system and the "TESA micro-hit 4-5-4" coordinate measuring machine. The aim of the study was to determine the differences in modern measuring systems and whether these differences affect the final measurement result when controlling parts of a complex configuration. At the beginning of the paper, the way of functioning of the used measuring systems and the results of research in this area are described. GOM Inspect software used for the ATOS and TRITOP measuring systems, while PC DMIS software used for the coordinate measuring machine. The analysis of the obtained results showed that there are significant differences in the measurement results and that the measuring systems used can't be applied with the same success to the measurement of parts of complex configuration such as the gearbox housing.

Analysis of Digitizing and Traditional Measuring System at Surface Measurement of Lids

2008 ◽  
Vol 381-382 ◽  
pp. 217-220 ◽  
Author(s):  
Branimir Barisic ◽  
M. Rucki ◽  
Z. Car
Keyword(s):  
Optical Sensor ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Surface Measurement ◽  
Contact Method ◽  
Measuring Systems ◽  
Measuring Methods ◽  
Noncontact Method ◽  
Measuring Machine

The focus of this paper will be on comparison at the measurement of container lids between Advanced TOpometric Optical Sensor - ATOS III SO (GOM mbH) and traditional coordinate measuring machine CMM for the measurement of surfaces - Form Talysurf Series 2 (Taylor Hobson Ltd). In the paper, two kinds of measuring methods (noncontact method at ATOS and contact method at CMM Form Talysurf) and techniques will be made for comparison: digitizing measuring system based on the triangulation principle and traditional measuring systems based on the collecting of points from an object by touching it.

scholarly journals Research on the Control Point Extraction Method of Chinese Gaofen 7 Satellite Using Altimeter and Footprint Camera

2020 ◽  
Vol 237 ◽  
pp. 01016
Author(s):  
Binbin Li ◽  
Huan Xie ◽  
Xiaohua Tong ◽  
Yinqiao Cai ◽  
Zhijie Zhang
Keyword(s):  
Information Acquisition ◽  
Control Point ◽  
High Accuracy ◽  
Ground Control ◽  
Observation System ◽  
Control Points ◽  
Accuracy Control ◽  
Laser Altimeter ◽  
Intensity Information ◽  
Earth Observation System

Satellite laser altimetry is one of the most advanced information acquisition technologies in Earth observation system. It can provide high-accuracy elevation information, however, due to the lack of detail intensity information, its planimetric accuracy is usually worse than the elevation accuracy. Gaofen 7 (GF-7) satellite scheduled for launch in 2019 will be equipped with laser altimeter, footprint camera, stereo mapping camera, etc. The laser altimeter together with the footprint camera was designed to provide high accuracy ground control point of satellite mapping. The laser altimeter can provide the high-accuracy elevation information and the joint processing of footprint camera and stereo mapping camera can provide high-accuracy planimetric information. Therefore, this paper mainly studies the technology of extracting high-accuracy control points based on GF-7 satellite’s altimeter, footprint camera and stereo mapping camera using a simulated dataset extracted from Quickbird image and ICESat altimetric data.

Development of a Measuring System for Planar Cam Profiles and Their Follower Motions

2004 ◽  
Author(s):  
Der-Min Tsay ◽  
Kuo-Shu Tseng ◽  
Hsin-Pao Chen
Keyword(s):  
Contact Point ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Displacement Curve ◽  
Practical Application ◽  
Test Bed ◽  
Theoretical Design ◽  
Cam Profile ◽  
Computing Procedure ◽  
Measuring Machine

A measuring system that can be used to inspect planar cam contours and to evaluate their follower displacement, velocity, and acceleration curves with a higher degree of accuracy without the aid of approximating follower displacements in traditional methods is constructed. Based on the geometric relationships at the contact point between a planar cam profile and its follower, analytical descriptions that can be utilized to determine the follower displacement curve and its derivatives are first identified. To verify the feasibility and accuracy of the algorithms proposed for the measuring system, analytical results generated from a theoretical design are compared to those obtained by the application of the computing procedure. To demonstrate the effectiveness and usefulness of the developed procedure, a measuring test bed has been constructed for a practical application example. Furthermore, the results obtained by using the built measuring system are also compared to those obtained by using a coordinate measuring machine (CMM) with the proposed algorithms.

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