Proposal of Absolute Length Measuring Machine by Combining Crystalline Lattice Scale and Laser Interferometry

2005 ◽  
pp. 819-823
Author(s):  
P. Rerkkumsup ◽  
M. Aketagawa ◽  
K. Takada ◽  
T. Takagi ◽  
T. Watanabe ◽  
...  
Keyword(s):  
Laser Interferometry ◽  
Crystalline Lattice ◽  
Absolute Length ◽  
Measuring Machine

scholarly journals Ultraprecision Diameter Measurement of Small Holes with Large Depth-To-Diameter Ratios Based on Spherical Scattering Electrical-Field Probing

2019 ◽  
Vol 9 (2) ◽  
pp. 242 ◽  
Author(s):  
Xingyuan Bian ◽  
Junning Cui ◽  
Yesheng Lu ◽  
Jiubin Tan
Keyword(s):  
Laser Interferometry ◽  
Electrical Signal ◽  
Diameter Measurement ◽  
Expanded Uncertainty ◽  
Electrical Field ◽  
Large Depth ◽  
High Measurement ◽  
Measuring Machine ◽  
Key Techniques ◽  
Sensing Characteristics

In order to solve the difficulty of precision measurement of small hole diameters with large depth-to-diameter ratios, a new measurement method based on spherical scattering electrical-field probing (SSEP) was developed. A spherical scattering electrical field with identical sensing characteristics in arbitrary spatial directions was formed to convert the micro gap between the probing-ball and the part being measured into an electrical signal. 3D non-contact probing, nanometer resolution, and approximate point probing—which are key properties for high measurement precision and large measurable depth-to-diameter ratios—were achieved. A specially designed hole diameter measuring machine (HDMM) was developed, and key techniques, including laser interferometry for macro displacement measurement of the probe, multi-degree-of-freedom adjustment of hole attitude, and measurement process planning, are described. Experiments were carried out using the HDMM and a probing sensor with a ϕ3-mm probing ball and a 150-mm-long stylus to verify the performance of the probing sensor and the measuring machine. The experimental results indicate that the resolution of the probing sensor was as small as 1 nm, and the expanded uncertainty of measurement result was 0.2 μm (k = 2) when a ϕ20-mm ring gauge standard was measured.

Calibration of Positional Errors in Coordinate Measuring Machines and Machine Tools Using a Laser Interferometer System

2015 ◽  
Vol 798 ◽  
pp. 303-307 ◽  
Author(s):  
Benedito di Giacomo ◽  
César Augusto Galvão de Morais
Keyword(s):  
Machine Tools ◽  
Coordinate Measuring Machine ◽  
Laser Interferometry ◽  
Dynamic Mode ◽  
Coordinate Measuring Machines ◽  
Measurement Systems ◽  
Volumetric Errors ◽  
Bridge Type ◽  
Measuring Machine

Dimensional inspections in manufactured workpieces allow assess the quality of the manufacturing process, in this context the quality and development of measurement systems are issues addressed by many researchers. The coordinate measuring machines (CMMs) are versatile systems, can measure complex geometries quickly and accurately. Positional errors are parts of volumetric error and affect the correct positioning of probe in CMMs or of the tool in machine tools. Faced with this, the purpose this investigation is show a method to calibrate the positional errors in a bridge-type coordinate measuring machine, this method collects data in dynamic mode and reduces cyclic errors. The calibration of positional errors was performed using laser interferometry in the “on-the-fly” mode and a method to reduce cyclic errors was applied. The highest value of position error occurred in x axis with value positive of 10μm in the position of 220mm, while in the y and z axis the higher absolute values were 2μm and 6μm respectively. From calibration and compensating of positional errors it is possible to reduce the effects of the volumetric errors in machines with axis of linear displacements as the CMMs and machine tools.

Development of a high accurate gear measuring machine based on laser interferometry

2015 ◽  
Author(s):  
Hu Lin ◽  
Zi Xue ◽  
Guoliang Yang ◽  
Yao Huang ◽  
Heyan Wang
Keyword(s):  
Laser Interferometry ◽  
Measuring Machine

Light automation for aircraft fuselage assembly

2019 ◽  
Vol 124 (1272) ◽  
pp. 216-236
Author(s):  
L. G. Trabasso ◽  
G. L. Mosqueira
Keyword(s):  
Low Cost ◽  
Coordinate Measuring Machine ◽  
Laser Interferometry ◽  
Test Methods ◽  
Open Loop ◽  
Integrated System ◽  
Industrial Robots ◽  
Performance Criteria ◽  
Automated Systems ◽  
Measuring Machine

ABSTRACTThe ever-growing need to improve manufacturing processes has led recently to an increase in the number of automation solutions used to assemble aircraft structural elements. A process of interest to this industry is the alignment of fuselage sections, which is currently done either manually or by complex, expensive automated systems. The manual method introduces a significant production delay and most automated systems have limited flexibility. This article presents an integration solution implemented in an alternative low-cost, high-flexibility alignment robotic cell. The performance of an optical coordinate measuring machine (CMM) as feedback source for the adaptive control of a conventional industrial manipulator is assessed. Laser interferometry readings are used as reference. The contribution of the work lies in the execution of experiments based on the EN ISO 9283 standard (Manipulating industrial robots - performance criteria and related test methods) to determine the adequacy of the commercial off-the-shelf system to the tolerances and requirements of the fuselage alignment process at hand. The optimal configuration of the integrated system attained the nominal alignment position with an average accuracy of 0.16mm and $0.004^\circ$ , partially meeting the required tolerances, and the obtained values are nearly 16x better compared to a baseline, open-loop manipulator. These results serve as reference for the aerospace industry in the development of the next generation of tools and automated assembly processes.

High-Accuracy Absolute Length Measurement Using an Optical-Comb Pulsed Interferometer: Verification of Coordinate Measuring Machines

2017 ◽  
Vol 11 (5) ◽  
pp. 682-690
Author(s):  
Kiyoshi Takamasu ◽  
Wiroj Sudatham ◽  
◽  
Keyword(s):  
Frequency Comb ◽  
Coordinate Measuring Machine ◽  
Test Method ◽  
Three Dimensions ◽  
Measuring System ◽  
Length Standard ◽  
Absolute Length ◽  
Measuring Machine ◽  
The Absolute ◽  
Fringe Patterns

The optical frequency comb has become a standard for length and frequency measurements. Its pulsed laser can produce temporal coherence interference fringe patterns, and these fringes can be used as the length standard for practical measurement of absolute lengths. This research aims to develop a measuring system for coordinate measuring machine (CMM) verification, which can be used to measure the absolute length of a target in three dimensions. Thus, a spherical target has been considered. A ball lens with a refractive index of 2.0 has been selected as the target for the interferometer in this study. Using the ball lens target, the absolute length can be measured up to 10 m, covering the medium- to large-sized range of CMM applications. The experimental results demonstrate that the measurement uncertainty is smaller than that of the artifact test. In addition, the measurement time of the proposed method is 60% less than that of the artifact-test method.

Measurements of the Cape Astrometric Survey of the Southern Hemisphere

1978 ◽  
Vol 48 ◽  
pp. 515-521
Author(s):  
W. Nicholson
Keyword(s):  
Southern Hemisphere ◽  
Automatic Measuring ◽  
Measuring Machine ◽  
Final Selection ◽  
Selection Of

SummaryA routine has been developed for the processing of the 5820 plates of the survey. The plates are measured on the automatic measuring machine, GALAXY, and the measures are subsequently processed by computer, to edit and then refer them to the SAO catalogue. A start has been made on measuring the plates, but the final selection of stars to be made is still a matter for discussion.

Simulation of three Dimensional Defect Images in Transmission Electron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 470-471
Author(s):  
W. D. Cooper ◽  
C. S. Hartley ◽  
J. J. Hren
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Three Dimensional ◽  
Crystalline Lattice ◽  
Continuum Models ◽  
Thin Foils ◽  
Transmission Electron ◽  
Microscope Images ◽  
General Computer Program ◽  
General Computer

Interpretation of electron microscope images of crystalline lattice defects can be greatly aided by computer simulation of theoretical contrast from continuum models of such defects in thin foils. Several computer programs exist at the present time, but none are sufficiently general to permit their use as an aid in the identification of the range of defect types encountered in electron microscopy. This paper presents progress in the development of a more general computer program for this purpose which eliminates a number of restrictions contained in other programs. In particular, the program permits a variety of foil geometries and defect types to be simulated.The conventional approximation of non-interacting columns is employed for evaluation of the two-beam dynamical scattering equations by a piecewise solution of the Howie-Whelan equations.

Sign in / Sign up

Export Citation Format

Share Document