Tomasz Janiczek

Analysis of PVDF transducer signals stimulated by mechanical tension

Abstract The subject of the research were the static and dynamic properties of a new PVDF-based transducer. The tested transducer was a cable consisting of an internal semiconductive electrode, a PVDF material and an external electrode in the form of a thin layer of semiconductive lacquer with copper wire for providing electrical contacts. The measurements of electrical signals (elongation, force, electrical charge) received under mechanical tension are presented. Piezoelectric coefficients d and g for tension were calculated on the basis of the measurements. The results can be used to make mechano-electrical models of such transducers.

Assessment of vehicle weight measurement method using PVDF transducers

Abstract In this paper, the usefulness of piezoelectric transducers for vehicle weight measurement is assessed. Under mechanical strain, such as compression or tension, a piezoelectric cable generates electrical charges that can be converted into an electrical signal. This property was exploited to design a model measurement setup in the form of an inclined plane to simulate the dynamic pressure exerted by a moving vehicle on the road. The moving vehicles momentum is converted into an electrical signal generated by the PVDF transducer under the influence of the vehicle pressure. The obtained results show the usefulness of the digital signal processing techniques for the processing of electrical signals received from PVDF transducers under deformation and the validity of this method of measuring the weight of moving vehicles.

Influence of piezoelectric cable processing steps on PVDF beta phase content

Abstract The piezoelectric property of PVDF cables is attributed to the structure of PVDF, i.e. its β phase content. The aim of this research was to optimize the processing steps (e.g. electroding, coating) to maximize the β phase content in PVDF cables manufactured by the technology developed in the Wroclaw Division of the Electrotechnical Institute (IEL). Microstructure examinations were carried out on samples drawn at random from both semi-finished and final products. The XRD examinations made it possible to assess the effect of texture orientation, temperature and speed of processing operations on the β phase content in the PVDF.

Equivalent Model of Modified Bismuth Oxides Described by Fractional Derivatives

Metal oxide modified Bi2O3 finds the application in metal oxide varistors and as ionic conductors. Electrical properties of MeO-modified Bi2O3 change with MeO modifier and sintering temperature. In this paper we report how to predict Bi2O3 electrical properties using simulation model. Measurements of the electrical response of the modified Bi2O3 oxides were carried out using the impedance spectroscopic technique. As a result an equivalent model of electrical behaviour of modified Bi2O3, described by fractional derivates was proposed. To test the model, the series of simulation were run on computer, and after subjecting the results to verification the equivalent parameters of electrical circuit were determined. Model was elaborated with the view of facilitating the research on metal oxide ionic conductors and varistors.