Galina M. Gorbova, Mikhail M. Gorbov, Gerard C.M. Meijer
Capacitive sensors can be applied for measuring different kind of non-electrical quantities, such as geometrical dimensions of subjects, thickness of films, displacement and vibration of grounded surfaces, position of the object and others. Existing three-electrode micro-displacement sensors, made in the shape of flat capacitor geometry, do have high values of sensitivity, but they also have notable non-linear behaviour over their whole gauge characteristics. A three-electrode coplanar sensor, subject of this paper, can be designed by calculation in such a way, that its gauge characteristic...
XVII IMEKO World Congress
· TC15
· 2003
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Jianbo Zhang, Maarten Korsten, Paul Regtien
Wear detection has traditionally restricted itself to offline study and measurement. In this paper a vision system for online monitoring and detection of wear is described. This system uses a video zoom microscope and a high-resolution monochrome camera to capture the image series of a moving surface under study. An algorithm based on multichannel filtering for the detection of wear patterns is presented. The wear patterns are extracted by filtering the acquired image using a Gabor filter bank with multiple narrow spatial frequency and orientation channels. Experiments show the feasibility...
XVII IMEKO World Congress
· TC15
· 2003
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Hiroki Yamamoto, Nobuharu Aoshima
In order to show a concrete application of the signal processing based on quaternion expression, a prototype of sealed measurement module which could be thrown into the stream of liquid or powdery materials was developed. This module’s shape is a small ball of about 40 mm across in diameter. And it consists of low power one-chip microcontroller, a couple of dual axis accelerometer, EEPROM, and batteries. So that, it can measure and record three dimensional acceleration by itself. As a preliminary experiment, the small sensor ball were suspended with a thick cord and swung by the speed...
XVII IMEKO World Congress
· TC15
· 2003
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Damir Semenski
Experimental optical method of caustics is established for solving the singularity at the crack tip through the stress intensity factor evaluation. Method is advantageously improved in application to mechanically anisotropic materials such as fiber-reinforced composites. Recently, the experiments are performed for different types of isotropic body contacts and the analysis of optical effects. Task of experiments is prediction of the future of inspected material surface and the assessment of structure damage. Theoretical fundamentals will prospectively provide the application of the method of...
XVII IMEKO World Congress
· TC15
· 2003
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Alfredo Cigada, Remo Sala, Emanuele Zappa
Image based measurement techniques allow for quick and contact-less measurement of single or multiple target displacement, shape, orientation and so on. The subpixel analysis increases the vision based displacement resolution. In the present paper resolution and uncertainty of 1D camera based displacement measurements is analysed, paying particular attention to the target geometry effect on the results. Comparison between camera based and laser interferometer displacement measurement is performed and some target modifications are tried, in order to reduce measurement uncertainty, due to...
XVII IMEKO World Congress
· TC15
· 2003
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Dominik Sankowski, Jacek Senkara, Krzysztof Strzecha
In this paper a new segmentation algorithm based on the k ñnearest neighbours statistical decision rule is presented. This algorithm was designed for use in systems of quantity image analysis, especially in industrial measurement systems. This algorithm was implemented in a system measuring surface tension and wetting angle parameters, knowledge of which is extremely important for the assessment of quality of solders, for example.
XVII IMEKO World Congress
· TC15
· 2003
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Klaus Hoffmann
Flat conveyor belts supported and driven by cylindrical drums run in a state of instability because of lack of guiding forces. Faults such as asymmetry in the position or shape of pulleys and idlers, uneven load distribution or acting transverse forces such as those induced by friction will make the belt run out of true. On the other hand, some of these effects are used for guiding flat running belts. This paper deals with the guiding effects of two significant features; the skewed cylindrical pulley and the conical pulley. In the first part the implemented measurements are described and in...
XVII IMEKO World Congress
· TC15
· 2003
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Stjepan Jecic Rudolf J. Beer, Janos Kodvanj, Martin Fleischmann
To solve spatial technical problems by three dimensional photoelasticity it is necessary to fix the optical effect in the model. In order to avoid the well known disadvantages of the classical freezing method ionising irradiation is used for that purpose. With this method it is not necessary to enlarge the scaling-factor for the displacement which is in some cases very important especially when shrinking is used to develop the fringe pattern. In addition fixation with ionising irradiation can be carried out without elevated temperatures. The most important advantage compared with the...
XVII IMEKO World Congress
· TC15
· 2003
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L. Casarotto, R. Tutsch, R. Ritter, H. Dierke, F. Klose, H. Neuhäuser
The Portevin-Le Châtelier effect has been investigated by means of an optical extensometer during tensile deformation of Al-3wt%Mg specimens. The propagation of bands with a concentrated deformation has been detected and its velocity measured. A real-time scanning of the phenomenon makes it possible to track the band propagation with an optical sensor.
XVII IMEKO World Congress
· TC15
· 2003
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Vygantas Augutis, Darius Gailius, Arturas Milinskas
The paper describes some Cathode Ray Tubes (CRT) Implosion Protection Systems (IPS) and their possible control methods. The implosion of CRT (tube) is prevented by using the Shrink Fit Rim Band (SFRB) reinforcing the edge of the tube so that it cannot bulge outwards. The main parameter of SFRB is the shrinking force. Measurement of such a shrinking force is a very important SFRB quality control method herewith of safe CRT. In this paper we consider several methods of shrinking force measurement: - Magnetization method; - Barkhausen’s noise method; - CRT imitator-measurer. Magnetization...
XVII IMEKO World Congress
· TC15
· 2003
· Download