Study of online 3D vision coordinate measuring system for large-scale equipments

2009 ◽  
Author(s):  
Qiaoyu Xu ◽  
Rensheng Che
Keyword(s):  
Large Scale ◽  
Measuring System ◽  
3D Vision

QUESTIONS ON OPTIMUM DEVELOPMENT OF COMPLEX FOR MULTI-POINT CONTROL AND EVALUATION OF CONTAMINATION OF WATER BASINS POLLUTED BY WASTE WATER OF MINING AND PROCESSING PLANTS

2021 ◽  
pp. 48-54
Author(s):  
B. L. Djafarova
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Natural Water ◽  
Large Scale ◽  
Measuring System ◽  
External Irradiation ◽  
Dissolved Organic Matters ◽  
Processing Plants ◽  
Optimum Type ◽  
Special Limitation

The paper is devoted to questions on optimum development of complex for control and evaluation of contamination of water basins used for collection of industrial waste water. The purpose of the paper is development of scientific-methodical basics for development of measuring system for control and evaluation of contamination of natural water basins with heavy metals using method of attenuation of irradiation of dissolved organic matters excited by external irradiation. The task on optimization of operational regime of measuring complex for control and evaluation of contamination of natural water basins by waste water of large scale point type polluter of environment with heavy metals. The known model of Shtern-Volmer is used as a basis which assumes non-linear relationship between formed complex and fluorescent irradiations attenuation degree. It is noted that potential possibilities of Shtern-Volmers model are used not fully till now. So that in known researches the water objects polluted by several same sources are mainly researched. It is shown that Shtern-Volmer model is also applicable for analysis and estimation of pollution of water basins by single strong polluter that is mining and processing plants. For analysis the suggested special parameter, inversely proportional to concentration of heavy metals in water is used. Integration of this parameter on all possible values of heavy metals concentration and imposition of special limitation condition on the searched for function of dependence of attenuated part of fluorescent irradiation on maximum concentration of heavy metals make it possible to formulate and solve the task on searching of optimum type of this function providing for the optimum regime of operation of the complex.

scholarly journals Microwave Tomography System for Methodical Testing of Human Brain Stroke Detection Approaches

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Ilja Merunka ◽  
Andrea Massa ◽  
David Vrba ◽  
Ondrej Fiser ◽  
Marco Salucci ◽  
...  
Keyword(s):  
Human Brain ◽  
Antenna Array ◽  
Large Scale ◽  
Imaging System ◽  
Reconstruction Algorithm ◽  
Human Head ◽  
Repeated Measurements ◽  
Measuring System ◽  
Dielectric Parameters ◽  
Iterative Reconstruction Algorithm

In this work, a prototype of a laboratory microwave imaging system suitable to methodically test the ability to image, detect, and classify human brain strokes using microwave technology is presented. It consists of an antenna array holder equipped with ten newly developed slot bowtie antennas, a 2.5 D reconfigurable and replaceable human head phantom, stroke phantoms, and related measuring technology and software. This prototype was designed to allow measurement of a complete S-matrix of the antenna array. The reconfigurable and replaceable phantom has currently 23 different predefined positions for stroke phantom placement. This setting allows repeated measurements for the stroke phantoms of different types, sizes/shapes, and at different positions. It is therefore suitable for large-scale measurements with high variability of measured data for stroke detection and classification based on machine learning methods. In order to verify the functionality of the measuring system, S-parameters were measured for a hemorrhagic phantom sequentially placed on 23 different positions and distributions of dielectric parameters were reconstructed using the Gauss-Newton iterative reconstruction algorithm. The results correlate well with the actual position of the stroke phantom and its type.

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 Portable Light Pen 3D Vision Coordinate Measuring System- Probe Tip Center Calibration

2013 ◽  
Vol 13 (4) ◽  
pp. 194-199 ◽  
Author(s):  
Shugui Liu ◽  
Hongling Zhang ◽  
Yinghua Dong ◽  
Shaliang Tang ◽  
Zhenzhu Jiang
Keyword(s):  
Accurate Determination ◽  
Least Square ◽  
Measuring System ◽  
Translation Vector ◽  
3D Vision ◽  
Fitting Method ◽  
Center Position ◽  
Tip Position ◽  
Light Pen

For different tasks, probe tip should be changed in the 3D vision coordinate measuring system and the accurate determination of probe tip center position is critical. A novel and simple approach for calibrating the probe tip center position of the light pen is presented in this paper. Hundreds of images of the light pen with different postures are collected while the probe tip is kept in firm contact with a reference conical hole. The probe tip position is determined by computing the rotation matrix and translation vector from the obtained images by using the least square fitting method. The experimental results demonstrate the effectiveness of the proposed approach. Its repeatability reaches 0.033 mm, 0.030 mm, and 0.043 mm in x, y, and z axes, respectively, and its convergence speed is satisfactory.

An Innovative Indoor Coordinate Measuring System for Large-Scale Metrology Based on a Distributed IR Sensor Network

2009 ◽  
Author(s):  
Maurizio Galetto ◽  
Luca Mastrogiacomo ◽  
Barbara Pralio
Keyword(s):  
Distributed System ◽  
Large Scale ◽  
Low Cost ◽  
Measuring System ◽  
Distributed Network ◽  
Network Configuration ◽  
Large Size ◽  
Sensor Devices ◽  
Coordinate Measurements ◽  
System Prototype

The aim of this paper is to describe the architecture and the working principles of a novel InfraRed (IR) optical-based distributed system, designed to perform low-cost indoor coordinate measurements of large-size objects. The hardware/software architecture and system functionalities are discussed, focusing the attention on the integration of methods for distributed network configuration, sensors self-calibration, 3D point localization, and data processing. A preliminary performance evaluation of the sensor devices as well as of the overall measuring system is carried out by discussing the experimental results obtained with a system prototype.

Study of multi-functional precision optical measuring system for large scale equipment

2017 ◽  
Author(s):  
Xingjian Jiang ◽  
Wenying Zhang ◽  
Yongxi Wang ◽  
Wei Jiang ◽  
Dabao Lao ◽  
...  
Keyword(s):  
Large Scale ◽  
Measuring System ◽  
Optical Measuring

scholarly journals The Verification of Rail Thermal Stress Measurement System

2019 ◽  
Vol 48 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Duan Xiangyu ◽  
Zhu Liqiang ◽  
Yu Zujun ◽  
Xu Xining
Keyword(s):  
Thermal Stress ◽  
Measurement System ◽  
Large Scale ◽  
Stress Measurement ◽  
Field Tests ◽  
Guided Wave ◽  
Measuring System ◽  
Cold Weather ◽  
Expansion Joints ◽  
Hot Weather

Continuous Welded Rail (CWR) is widely used in modern railways. With the absence of the expansion joints, CWR cannot expansion freely when the temperature changes, which could cause buckling in hot weather or breakage in cold weather. Therefore, rail thermal stress measuring system plays an important role in the safe operation of railways. This paper designed a thermal stress measurement system based on the acoustoelastic effect of the ultrasonic guided wave. A large-scale rail testbed was built to simulate the thermal stress in the rail track, and to establish the relationship of time-delay of guided wave and thermal stress. After laboratory testing, the system was installed in several railway lines in China for field tests. The results showed that the system was stable and accurate in stress measurement. The performance and potentials of the system were discussed.

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