Browsing by Author "Holyaka, Roman"

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Measuring logarithmic signal converter for magnetic tracking systems
(Видавництво Львівської політехніки, 2020-02-24) Holyaka, Roman; Marusenkova, Tetyana; Fedasyuk, Dmytro; Lviv Polytechnic National University
The work deals with the problem of signal conversion in magnetic tracking systems. Magnetic tracking systems are a novel development trend of navigation sensors within the concepts of the Internet of Things and virtual and augmented reality. In contrast to optical tracking systems, magnetic ones do not suffer from occlusions. In comparison with tracking systems built upon inertial sensors, they are not susceptible to bias drift and provide better accuracy. Magnetic tracking technology is based on calculating the position of objects upon the dynamic measurement of the reference magnetic field vectors. The reference magnetic fields are formed by arrays of actuator coils in the low-frequency electromagnetic radiation spectrum. Those who implement a magnetic tracking system have to ensure noise-immune measurements of signals coming from sensor coils in a wide dynamic measurement range. The range changes from microvolts for distances of several meters in couples “actuator-sensor” to hundreds of millivolts in the case if the distances in “actuator-sensor” couples reduce to several centimeters. Thus, one requires signal converters able to provide highly noise-immune measurements in a dynamic measurement range covering six orders of magnitude. The work presents the results of development, simulation, and investigation into a signal converter for magnetic tracking systems, whose novelty consists in combining the methods of logarithmic amplification and synchronous demodulation of the output signals of the sensor coils. The main nodes of the developed signal converter are a control unit, a logarithmic amplifier, a synchronous demodulator, a low-pass filter, an actuator driver and an analog-to-digital converter. Voltage logarithm compression has been performed upon volt-ampere characteristics of semiconductor p-n junctions. The synchronous demodulator provides a high level of selection of the useful signal out of electromagnetic noise. The results presented in this paper are part of our complex research work related to the development of the Magnetic Tracking System Integrated Development Environment (MTS-IDE). The latter is being developed by a team of scholars within different projects and is aimed at enhancing the efficacy of parametric optimization and synthesizing firmware of embedded systems implementing integrated magnetic tracking sensors. Simulation and experiments have shown that the dynamic range of noise-immune signal measurement using the developed converter covers six orders of magnitude, from 1E-6 V to 1 V. Investigation into functionality were conducted by oscillograph methods. The characteristics of the proposed solution were measured by the above-mentioned MTS-IDE. The obtained results are of key importance for further improvement of magnetic tracking systems, particularly, for their noise-immune measurement volume expansion.
Microprocessor noise-immune signal transducer for galvanomagnetic smart sensor devices
(Видавництво Львівської політехніки, 2012) Holyaka, Roman; Yurchak, Iryna; Marusenkova, Tetyana; Ilkanych, Victoriya
The work considers principles of design and a block diagram of a noise-immune signal transducer of galvanomagnetic smart sensor devices included those based on Hall sensors.
Multipurpose solid-state integrated circuits for sensor transfer characteristic formation
(Видавництво Національного університету "Львівська політехніка", 2002) Holyaka, Roman; Hladun, Michael; Lviv Polytechnic National University
The design philosophy and elaboration results for multipurpose solid-state integrated circuits for sensor transfer characteristic formation are considered in the paper. The circuits for linearization and thermocompensation of transfer function and for multiplication of temperature coefficient are presented. Elaborated integrated circuits are characterized by simplicity and operation with low-voltage unipolar supply sources and they allow to improve precision and widen functional applications of new generation sensor devices.
The synthesis of mathematical model for magnetotransistor using PSPICE software
(Видавництво Національного університету "Львівська політехніка", 2002) Holyaka, Roman; Hladun, Michael; Humenyuk, Iryna; Sopilnyk, Lyubomyr; Lviv Polytechnic National University; National Institute of Applied Science in Toulouse, France
We present the methods for synthesis of magnetotransistor mathematical model based on dual-collector structure of lateral transistor using PSPICE software. The complexity of magnetotransistor model is caused by special effects which concern these transistors. We considered main special effects such as parasitic carrier extraction from epitaxial layer into substrate and dependence of magnetotransistor parameters on base accelerating field.