Christian Eugène, Michaël Demeyere
The first part of the paper, mainly of tutorial nature, will be devoted to the presentation of the basic principles of 3D measurements by triangulation under lighting structured by laser planes. The metrological aspects will then be considered, namely the calibration of the measuring set-up. Finally, a series of industrial applications developed in the laboratory and oriented towards the conception of new field instruments (non-contact measurement of linear objects, of the angle between planes, of the diameter of cylinders, …) will be presented. The experimental results show a general...
TC4 Symposium 2004
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Michal Malátek, Pavel Ripka, Petr Kašpar, Antonín Platil, Ludek Kraus
This paper deals with an electronics developed for controlling of contactless current sensor based on magnetoimpedance (MI) effect. The demands required on design of the electronics came from current sensor structure, which takes into account suppression of temperature dependences of impedance of MI material. The electronics, due to its advantageous design, can serve also as the electronics of single and double-cored MI sensors in general.
TC4 Symposium 2004
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S. Cherepov, O. Hesse, G. Mook, S. Pankratyev, V. Uchanin
Optimisation of low frequency eddy current probes was performed using traditional inductive coils and commercially available AMR and GMR sensors and sensor modules. Results of three groups are presented demonstrating that such kind of eddy current probes show high penetration and sensitivity at low testing frequencies. The lack of objective criteria for comparison had to be stated. A Round Robin test is proposed between the presented groups with more objective criteria to be established before and during the test.
TC4 Symposium 2004
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Michael Gürtner, Norbert Neumann, Friedrich Schneider
Besides humidity the content of CO 2 is the most important air quality parameter in private homes. On the other hand power consumption for heating and air conditioning contributes essentially to the worldwide energy problems. An effective way to reduce it is to develop decentralized air conditioning systems consisting of optimal matched components. A major component is the air quality sensor which has not only to acquire CO 2 but also humidity and temperature. Further on such a sensor needs powerful data processing features and an interface to a bus system (either by TP or RF). The design...
TC4 Symposium 2004
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Jan Fischer, Tomáš Radil, Jan Šedivý
The so-called triangulation method of contact-less dimension measurement determines the measured object’s dimension from its shadow projected on an imaging sensor without lens. A point light source is used to illuminate the measured object. The so far used linear CCD sensors introduced a considerable uncertainty to the measurement. Application of area CMOS imaging sensors improves the measurement uncertainty and enables to use some new measurement methods. A special CMOS measuring camera was designed for this purpose.
TC4 Symposium 2004
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S. Vaitsi, E. Hristoforou
In this paper we illustrate results concerning measurements of the real and imaginary part of the dielectric constant of BaTiO 3 pellets doped with Sr, as a function of temperature and frequency. Substitution of Ba with Sr was up to 40% (x=0.1, 0.2, 0.3, 0.4, 0.5). It is shown that the Curie temperature of the ferroelectric to paraelectric transition is a monotonic dependence of Sr% and has an influence in the dielectric constant. Furthermore, frequency dependence also illustrates that oscillation ability of the electric dipoles is not monotonic, being dependent on the ferroelectric dipole...
TC4 Symposium 2004
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N.Kontos, L.Theodorakis, E.Hristoforou
This presentation describes the block diagram, explains the principal idea and shows the experimental results of a displacement and stress sensor. Both applications are based on inductive effects, while the examination of the sensor response determines the dependence of the permeability for all the different tested materials (magnetic cores) on the excitation frequency, the applied stress and the displacement of the material.
TC4 Symposium 2004
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C. Manassis, V. Karagiannis, D. Bargiotas, S. Voliotis, T. Maris
In this paper we present a fluid flow-meter based on the inductive response of glass covered FeSiB amorphous wires, arranged as vertical active cores with respect to the flow of a liquid in a pipe of circular or rectangular diameter. Arrays of parallel FeSiB glass covered wires, fixed at the one end and free at the other are set normal to the fluid flow inside of an array of thin coils, thus covering the whole cross section of the fluid conduit. An excitation coil is also used for static flow measurements. The displacement of each glass covered wire corresponds to the local velocity of the...
TC4 Symposium 2004
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V. Karagiannis, D. Bargiotas, S. Voliotis, C. Manassis
In this paper we present results on the response of linear variable differential transformers (LVDT) using FeSiB glass covered wires as active cores. First we demonstrate that the noise level of the sensor decreases with the magnetostriction coefficient of the magnetic core of the wire. Magnetic noise is further decreased after heat treatment, magnetic annealing and stress-current annealing. These results are in relatively acceptable agreement with results presented in the past by other research groups.
TC4 Symposium 2004
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Salvatore Baglio, Vito Caruso, Nicola Pitrone, Nicolò Savalli
This paper deals with the problem of estimating the ice fraction in ice slurry fluids flowing into the pipes of industrial refrigeration apparatus based on secondary refrigerants. Such measurements must be performed in a non invasive way and the sensors must face with severe environmental conditions. Two different sensors have been developed and are presented here. In particular, an optical sensor is presented that relates the transmission of signals with the ice density, while a capacitive sensor is proposed as well exploiting the effects of ice particles concentration on the ice slurry...
TC4 Symposium 2004
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