The modeling of portable 3D vision coordinate measuring system

2005 ◽  
Author(s):  
Shugui Liu ◽  
Fengshan Huang ◽  
Kai Peng
Keyword(s):  
Measuring System ◽  
3D Vision

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.

scholarly journals Performance evaluation of a portable 3D vision coordinate measuring system

Automatika ◽  
2017 ◽  
Vol 58 (3) ◽  
pp. 253-265
Author(s):  
Octavio Icasio-Hernández ◽  
José-Joel González-Barbosa ◽  
Yajaira-Ilse Curiel-Razo ◽  
Juan B. Hurtado-Ramos
Keyword(s):  
Performance Evaluation ◽  
Measuring System ◽  
3D Vision

Calibration Algorithm for Structured Light 3D Vision Measuring System

2008 ◽  
Author(s):  
Haihua Cui ◽  
Ning Dai ◽  
Tianran Yuan ◽  
Xiaosheng Cheng ◽  
Wenhe Liao
Keyword(s):  
Structured Light ◽  
Measuring System ◽  
3D Vision ◽  
Calibration Algorithm

Self-calibration of probe tip center for 3D vision coordinate measuring system in portable light pen

2013 ◽  
Vol 21 (7) ◽  
pp. 1727-1733
Author(s):  
刘书桂 LIU Shu-gui ◽  
董英华 DONG Ying-hua ◽  
姜珍珠 JIANG Zhen-zhu
Keyword(s):  
Measuring System ◽  
3D Vision ◽  
Self Calibration ◽  
Light Pen

A Portable 3D Vision Coordinate Measurement System Using a Light Pen

2005 ◽  
Vol 295-296 ◽  
pp. 331-336 ◽  
Author(s):  
S.G. Liu ◽  
K. Peng ◽  
F.S. Huang ◽  
Guo Xiong Zhang ◽  
P. Li
Keyword(s):  
Measurement System ◽  
Ccd Camera ◽  
Measuring System ◽  
Light Sources ◽  
Object Surface ◽  
Laptop Computer ◽  
3D Vision ◽  
Measuring Device ◽  
Vision Measurement ◽  
Light Pen

A portable three-dimensional vision coordinate measuring system is proposed in this paper. It consists of a light pen, a CCD camera and a laptop computer. The light pen is a hand-held probe with three point light sources using LEDs and a spherical touch stylus arranged in one line. The CCD camera takes the image of LEDs on the light pen and the 3D coordinates of measured point at the center of touch stylus are obtained by computing the positions of LEDs in the image when the probe contacts the object surface. The equations of the vision measurement system are derived by using perspective of three collinear points and spatial analytic geometry. The measuring device can be set up easily on an industrial site and the measurement is convenient. The object surface can be simple, complex, or hidden from the view of camera. The effectiveness of the mathematical model and validity of the measuring system are confirmed by experiments.

High-voltage monitoring by the fiber-optic recirculating measuring system

2020 ◽  
pp. 38-44
Author(s):  
A. V. Polyakov ◽  
M. A. Ksenofontov
Keyword(s):  
Optical Fibers ◽  
High Voltage ◽  
Optical Sensors ◽  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Electric Power Industry ◽  
Measuring System ◽  
Voltage Range ◽  
External Electromagnetic Fields ◽  
Optic Communication

Optical technologies for measuring electrical quantities attract great attention due to their unique properties and significant advantages over other technologies used in high-voltage electric power industry: the use of optical fibers ensures high stability of measuring equipment to electromagnetic interference and galvanic isolation of high-voltage sensors; external electromagnetic fields do not influence the data transmitted from optical sensors via fiber-optic communication lines; problems associated with ground loops are eliminated, there are no side electromagnetic radiation and crosstalk between the channels. The structure and operation principle of a quasi-distributed fiber-optic high-voltage monitoring system is presented. The sensitive element is a combination of a piezo-ceramic tube with an optical fiber wound around it. The device uses reverse transverse piezoelectric effect. The measurement principle is based on recording the change in the recirculation frequency under the applied voltage influence. When the measuring sections are arranged in ascending order of the measured effective voltages relative to the receiving-transmitting unit, a relative resolution of 0,3–0,45 % is achieved for the PZT-5H and 0,8–1,2 % for the PZT-4 in the voltage range 20–150 kV.

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