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Yong-Hak Huh, Dong-Iel Kim,Chang-Doo Kee
ESPI TECHNQIUE FOR MEASURING MICRO-TENSILE PROPERTIES OF THIN FILM MATERIALS

In-plane ESPI(electronic Speckle Pattern Interferometric) technique was developed to measure the micro-mechanical properties for thin film materials. The properties were determined from the micro-tensile stress and strain curve by measuring micro-tensile strain in micro-sized specimen 0.5 µm thick and 200 µm wide. The specimen was monotonically loaded by the micro-tensile loading system developed in this study. The micro-tensile strain during tensile loading was measured using the in-plane ESPI technique. In order to continuously measure the strain during loading, the subsequent strain measurement algorithm was developed. Furthermore, sensitivity to measurement of the strain was enhanced by phase estimation algorithms: sinusoidal fitting technique and object-induced dynamic phase shifting technique. Using these algorithms, the micro-tensile stress-strain curves were generated. It is shown that the sensitivity was increased by 6 times to a maximum.

Matías Roberto Viotti, Armando Albertazzi G. Jr., Ricardo Suterio
A MICHELSON INTERFEROMETER AS A CALIBRATION TOOL OF A RADIAL IN-PLANE DIGITAL SPECKLE INTERFEROMETER

The paper reports on the use of a Michelson interferometer for calibration of a radial in-plane digital speckle pattern interferometer. Also presents a numerical method to calculate a correction factor from the assessment of the displacements measured with both interferometers. This factor allows correcting mistakes introduced in the measurement process and generated mainly by a laser diode, which is used as light source of the digital speckle pattern interferometer. The description of the experimental set up and calibration procedure are presented. Experimental results obtained during one calibration process are also given. Finally, it will be demonstrated that the calibrated RIP system can measure displacements with a smaller average deviation, once the experimental results were analyzed and the calibration process was carried out, since it diminished from 6.2 % up to 1.5 %.

Leonardo Massunari Lieu, Agenor de Toledo Fleury
PROJECT OF A MICROPOSITIONING SYSTEM FOR A ROUNDNESS MEASURING MACHINE

This work presents the design of a X-Y table, which features a “Deadbeat” type controller to be used as an auxiliary device in a roundness measuring machine.
In order to give evidences and to complete the development of this work, several numerical simulations have been executed through the timing of the work and a prototype has been built to test the concepts.

Rodrigo Riquelme, Ignacio Lira, Carlos Pérez-López, Juan A. Rayas, Ramón Rodríguez-Vera
INTERFEROMETRIC MEASUREMENT OF A DIFFUSION COEFFICIENT

In this paper we present two methods to measure the diffusion coefficient in transparent media using electronic speckle pattern interferometry (ESPI). Although these methods are not new, it appears that they have not been compared, and that the proposed scheme of data treatment by least-squares adjustment for one of these methods has not been applied before. The methods were tested on a cell containing a 1.75 M NaCl solution diffusing into distilled water. Results using either method were very similar and they compare well with the value of the diffusion coefficient reported in the literature for the two substances.

Bartosz Gapinski, Miroslaw Grzelka, Miroslaw Rucki
THE ACCURACY ANALYSIS OF THE ROUNDNESS MEASUREMENT WITH COORDINATE MEASURING MACHINES

In the article, the form deviation (roundness) measurement with the Coordinate Measuring Machine has been discussed. The influence of the measuring points number and the type of the roundness deviation on the result (since different fitting elements are used) has been presented. The obtained investigation results prove that minimal number of points is not enough for measurement, while the too large number does not improve the measurement, as well. The recommendation on the measuring points number have been given.

B. Dhanasekar, B. Ramamoorthy
SURFACE ROUGHNESS EVALUATION OF CYLINDRICAL MACHINED SURFCAES

Computer vision based on digital image processing is a fast emerging as a research tool in various branches of engineering. In manufacturing engineering environment it is mainly used for robot applications like inspection, recognition and navigation. In this work the area of application is extended to incorporate its use in metrological applications where the objective of the work had been to evaluate the surface roughness of cylindrical machined surface (turned) using machine vision technique. Basically to estimate the roughness of a cylindrical surface based on the images would pose a fundamental problem as the surface being a doubly curved one. This image distortion need to be resolved before proceeding to the evaluation of roughness of such surfaces. This study uses involved the geometric correction technique by developing an algorithm in which distortion encountered in the projection of cylindrical machined surface image is rectified. The quantification for surface roughness after opening the surfaces is performed using the surface image parameters (spatial frequency (F), arithmetic mean value (Ga) and standard deviation (STD)). Then the Group Method of Data Handling (GMDH) technique was used to obtain an analytical relationship of the roughness parameters calculated using the digital surface image and the stylus instrument values. An analysis based on the comparison to make sure that the present approach of estimation of surface finish based on the digital processed image could be implemented in practice, is presented in this paper.

Saulius Kaušinis, Aurimas Jakštas, Rimantas Barauskas, Albinas Kasparaitis
INVESTIGATION OF DYMANIC PROPERTIES OF LINE SCALE CALIBRATION SYSTEMS

The paper addresses the error-related problems specific to line scale calibration in dynamic mode of operation that are caused primarily by geometrical and thermal deviations of the calibration system components. A new 3D finite element model has been developed in order to both investigate thermo-mechanical processes in the comparator structure and evaluate possible temperature influence on geometrical dimensions of the line scale. An interferometer-controlled comparator setup with a moving microscope has been designed to evaluate the performance of the long scale calibration process.

Ilknur Cavusoglu, M.Numan Durakbasa, P. Herbert Osanna
PROCESS PERFORMANCE EVALUATION AND IMPROVEMENT FOR THE QUALITY PROGRESS IN THE INDUSTRIAL MANUFACTURING SYSTEMS

As the competition gets tougher, there is more pressure on manufacturing sectors to improve quality and customer satisfaction while decreasing cost and increasing productivity. These can be achieved by using modern quality management systems and process improvement techniques to reduce the process variability and driven waste within manufacturing process using effective application of statistical tools. There are a number of different methods for collecting and evaluation data. One of them is pre-control. Pre-control is a technique that helps shop operators to control the process so that defective parts are not produced. This technique is also simple to understand for the shop operators and statistically robust. In this study, it was used this techniques for the quality progress of the production parts with one-sided geometrical tolerances.

Stanislaw Adamczak,Dariusz Janecki, Krzysztof Stepien
AN ANALYSIS OF ERRORS OF V-BLOCK CYLINDRICITY MEASUREMENT WITH REGARD TO THE METHOD PARAMETERS

At the Kielce University of Technology (PL) a new method of cylindricity measurements using V-blocks has been developed. Results of the statistical verification of the method show that its accuracy equals about 19% in relation to accurate radial method. The paper presents results of the research work covering the analysis of potential sources of errors of the method, related to the method parameters.

Petri Österberg, Heimo Ihalainen, Risto Ritala
MEASUREMENT OF WOOD QUALITY PARAMETERS FROM ANNUAL RINGS USING COLOR ANALYSIS WITH DIGITAL IMAGES

In this paper we present an image analysis method which provides wood quality parameters from board and log end images. Our analysis recognizes annual rings in prepared cutting surface despite of varying color pattern or lighting. After locating annual rings accurately, proportions of earlywood and latewood can be measured globally and locally in the image. Our method is based on combining moving window to principle component analysis (PCA). Furthermore, we apply various filtering methods to enhance result matrixes.

Page 845 of 936 Results 8441 - 8450 of 9356