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1
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Study on the Rayleigh Hysteresis Model and its Applicability in Modeling Magnetic Hysteresis Phenomenon in Ferromagnetic Materials

100%
Kachniarz M., Szewczyk R.
Acta Physica Polonica A
|
2017
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vol. 131
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issue 5
1244-1249
EN
The following paper presents the basis of a Rayleigh magnetic hysteresis model and the examples of its application for modeling the magnetic characteristics of ferromagnetic materials: ferrites and steels. The presented model allows one to simulate the shape of a magnetic hysteresis loop of the material for the given value of the magnetizing field in the so-called Rayleigh region, as well as to calculate basic magnetic parameters of the material like coercive field, magnetic remanence, and power loss. Four different ferromagnetic materials (two ferrites and two alloy steels) were chosen for the investigation. Each material was investigated within the range of low magnetizing fields, corresponding to the Rayleigh region. On the basis of obtained results, modeling of magnetic characteristics of the investigated materials was performed. Moreover, the range of magnetizing field where the Rayleigh model can be applied for these materials was investigated based on correlation coefficient between experimental results and modeling.
2
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Temperature Influence on the Functional Properties of Inductive Components with Mn-Zn Ferrite Cores

81%
Jackiewicz D., Kachniarz M., Bieńkowski A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1038-1040
EN
The paper presents the results of investigation of the temperature influence on the inductance and power losses in ferrite cores. Such effect can significantly influence the utility parameters of electronic devices, particularly in precision equipment. For example slight parameter change in this type of components in measuring devices can cause significant changes in output parameters. It is also equally important for mobile devices where increase of losses can limit the duration of service. Special measurement system composed of hysteresis graph, cryostat and PC was utilized to perform the experiment. The cores used during the investigation had closed magnetic circuit. In order to perform measurements of magnetic properties of the material, two sets of windings (magnetizing and sensing) were made on each core. The cores were placed in a cryostat, which was used to set the temperature value within the range from -20 to +50°C. The magnetic properties were measured by the hysteresis graph, to assess the influence of the temperature on the functional parameters.
3
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Active LR Integrator Circuit with Ferrite Core

81%
Gazda P., Nowicki M., Kachniarz M.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1041-1044
EN
The paper presents the idea of active LR integrator circuit based on ferrite core. The LR topology, in contrast to contemporary RC, allow for drift-free operation of the integrator. Presented circuit is intended as main component of continuous operation fluxmeters and magnetoelastic transducers, especially working with low frequency signals. Critical component for proper frequency range and low signal distortion is the core material, which should allow for close-to-ideal inductance in the circuit. Presented simulation, measurement results, and total harmonic distortion analysis show that the proposed circuit works correctly.
4
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Modelling the Influence of Stresses on Magnetic Characteristics of the Elements of the Truss Using Extended Jiles-Atherton Model

81%
Jackiewicz D., Szewczyk R., Kachniarz M., Biedrzycki R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1189-1191
EN
Steel trusses structures are commonly used in civil engineering. Their mechanical parameters, especially the durability, are critical, and often human life depends on it. Therefore it is very important to monitor the critical elements of the truss. For this purpose magnetoelastic method of measurement may be used. It is a method having several advantages over other methods, particularly because of use of elements which are already parts of the structure. The study of structural elements have already been conducted. However, to take advantage of the magnetoelastic characteristics measurement to assess the state of stress, one should have a model of the influence of stress on magnetic properties. The influence of stresses on hysteresis loops was modelled with the extended Jiles-Atherton model. The obtained results of the modelling are consistent with the experimental measurements results. The results of modelling create new possibilities of explanation of the physical phenomena connected with magnetization of the magnetic materials under stresses, which is especially important for the assessment of the state of the constructional steel during its exploitation in industrial conditions.
5
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The Satellites Orientation Method using a Torque Magnetic Drive

81%
Korobiichuk I., Kachniarz M., Nowicki M.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
722-724
EN
Small values of external perturbation forces made it possible to use a torque magnetic drive as a control system. Today, satellite orientation systems use pulsed-type algorithm for discharge of an angular momentum accumulator. The feasibility of using other algorithms (continuous, continuous-pulsed and algorithm of torque magnetic drive operation using `forecast' models of accumulated angular momentum and geomagnetic field) is not covered and not examined, although each has certain advantages for certain types of satellites and their conditions of operation in space. The article highlights satellites operating conditions in space, considers satellites orientation method using a torque magnetic drive and substantiates the necessity of satellite motion simulation with further establishing a technique for evaluation of orientation system given the effect of permanent magnetic and gravitational fields, the type of discharge of accumulated angular momentum, the height of trajectory and the nature of random perturbations.
6
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Isolated DC and AC Current Amplifier with Magnetic Field Sensor in Loop and Amorphous Ring Core

81%
Petruk O., Kachniarz M., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1174-1176
EN
This paper presents innovative isolated DC and AC current amplifier containing magnetic field sensor in the feedback loop. The amorphous ring core with an air gap is utilized as a part of the galvanic isolation separating input and output currents. In the paper outline of the amplifier is presented. The printed circuit board project was developed and electronic circuit of the amplifier was manufactured. The developed device was investigated with DC and AC current and the results are presented in the paper. Results indicate usefulness of the developed device in described application.
7
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Novel Method of Offset Voltage Minimization in Hall-Effect Sensor

81%
Petruk O., Kachniarz M., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1177-1179
EN
The paper presents numerical model and validation of new methodology of offset voltage minimization in the Hall-effect sensors. Model of the Hall-effect sensor with multiple electric pins was developed. Mathematical equations used for calculation of electric potential difference were formulated. Simulations were carried out using finite elements method in ELMER FEM software. Performed investigation of actual parameters of newly designed Hall-effect sensor confirms effectiveness of the described method.
8
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Active LR Integrator Circuit for Drift-Free Magnetoelastic Transducer

81%
Gazda P., Nowicki M., Kachniarz M.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
745-747
EN
Current integrator systems usually use active RC integrator circuits. Crucial dificulty associated with this analogue system is the integrator drift. The following paper presents the idea of the active integrator circuit based on inductive and resistive components. This concept allows to eliminate the time drift of the circuit, which is undesired phenomenon resulting from capacitive components working in the traditional negative feedback loop. The SPICE simulations were performed to validate the presented idea. Then, prototype circuit with discrete components was tested. Inductors were based on nanocrystalline and air cores. The developed solution was tested as magnetoelastic sensors transducer, to confirm the ability for long-term, continuous, drift-free, integrator circuit operation. The results were compared with traditional, RC circuit with automatic drift compensation.
9
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Investigation of Magnetoelastic Properties of Ni_{0.36}Zn_{0.64}Fe₂O₄ Ferrite Material under Low Magnetizing Fields Corresponding to Rayleigh Region

81%
Kachniarz M., Bieńkowski A., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1066-1068
EN
The following paper presents original results of study on the magnetoelastic properties of Ni-Zn (nickel-zinc) ferrite material under low magnetizing fields, corresponding to the so-called Rayleigh region. The investigated Ni_{0.36}Zn_{0.64}Fe₂O₄ material was formed into frame-shape sample allowing to obtain uniform stress distribution. Special digitally controlled measurement system was utilized to perform investigation. Obtained results are presented in the paper. On the basis of them mathematical description of magnetoelastic effect in investigated material was developed as an extend of the Rayleigh model of magnetic hysteresis. Comparison of the experimental and modeling results indicates that the developed model is correct.
10
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Magnetoelastic Villari Effect in Ferrite Materials for Force and Stress Sensors Working in Low Magnetizing Field Region

81%
Kachniarz M., Bieńkowski A., Salach J., Szewczyk R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1056-1059
EN
The following paper presents the original results of investigation on the magnetoelastic properties of ferrite materials magnetized in low field region, which could be utilized in development of force and stress sensors. The objects of investigation were two ferrite materials (manganese-zinc Mn-Zn and nickel-zinc Ni-Zn). The magnetoelastic characteristics of the materials were investigated with the special measurement system, allowing measurement of magnetic parameters of the ferrite materials magnetized with low fields under the influence of the compressive stress. The obtained results indicate that there is a strong correlation between the magnetic properties of the material in low magnetizing field region, and applied mechanical stress, which allows development of the magnetoelastic stress or force sensor with ferrite core working in low magnetizing field region.
11
Content available remote

Methods and Ways of Piezoelectric Accelerometers Fastening on the Objects of Research

71%
Korobiichuk I., Bezvesilna O., Kachniarz M., Koshovyj M., Kvasnikov V.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1112-1115
EN
Methods and ways of piezoelectric measuring converters fastening on the objects of research are considered in the article. Piezoelectric accelerometers are sensors of a contact type, they have a mechanical contact with the object of research. The peculiarity of such connection is the fact that the object immediately has an influence on the output signal of the accelerometer. Therefore, study of methods and ways of piezoelectric accelerometers fastening on the objects of research is, undoubtedly, topical. Their advantages and disadvantages are specified. Recommendations about the choice of the way of piezoelectric measuring converters fastening on the objects of research depending on the operating conditions are made.
12
Content available remote

Magnetic Amorphous Micro-Force Sensor

71%
Nowicki M., Kachniarz M., Juś A., Charubin T., Radzikowska-Juś W.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1180-1182
EN
In this paper the innovative method of microforce measurement based on air gap influence on magnetic circuits properties is presented. Magnetic ribbon core with air gap is put under transverse compressive stress perpendicular to the magnetic field direction generated by low-mass calibration weight. Change of the air gap induced by the force acting on the core causes change of its magnetic parameters. The possibility of utilization of various magnetic amorphous materials is investigated. Obtained results indicate a possibility of application of the developed sensor in microforce measurements.
13
Content available remote

Magnetoelastic Villari Effect in Structural Steel Magnetized in the Rayleigh Region

71%
Kachniarz M., Kołakowska K., Salach J., Szewczyk R., Nowak P.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
660-662
EN
The following paper presents the results of investigation on the magnetoelastic Villari effect in structural steel magnetized in the so-called Rayleigh region, which corresponds to relatively low magnetizing fields, much lower than coercive field. Two grades of structural steel were investigated during the performed measurements. Obtained results indicate significant correlation between applied mechanical stress and magnetic properties of the investigated materials.
14
Content available remote

Discrete Inverse Transformation for Eddy Current Tomography

62%
Nowak P., Urbański M., Raback P., Ruokolainen J., Kachniarz M., Szewczyk R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
701-703
EN
Paper presents results of a discrete inverse tomography transformation on exemplary results from eddy current tomography setup. Eddy current phenomena is highly non-linear and measurement results are ill-posed function of distribution of physical properties of the matter (mostly electrical conductivity and magnetic permeability). Thus the inverse transformation (reconstruction of objects shape) is based on an optimization algorithm in which objects model is described as a discrete array. With the usage of Finite Element Method (FEM) tomography measurement process is reconstructed and modelling results are compared with the measurement.
15
Content available remote

Functional Properties of Monolayer and Bilayer Graphene Hall-Effect Sensors

62%
Kachniarz M., Petruk O., Salach J., Ciuk T., Strupiński W., Bieńkowski A., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
|
issue 5
1250-1253
EN
The paper describes the design, development, and investigation of a new type of Hall-effect sensors of a magnetic field made of graphene. The epitaxial growth of high-quality graphene structures was performed using a standard hot-wall CVD reactor, which allows for easy integration with an existing semiconductors production technologies. The functional properties of developed Hall-effect sensors based on graphene were investigated on special experimental setup utilizing Helmholtz coils as a source of reference magnetic field. Monolayer and quasi-free-standing bilayer graphene structures were tested. Results presented in the paper indicate that graphene is very promising material for development of Hall-effect sensors. Developed graphene Hall-effect sensor exhibit highly linear characteristics and high magnetic field sensitivity.
16
Content available remote

Temperature Resistance of Magnetoelastic Characteristics of 13CrMo4-5 Constructional Steel

52%
Jackiewicz D., Kachniarz M., Rozniatowski K., Dworecka J., Szewczyk R., Salach J., Bienkowski A., Winiarski W.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
614-616
EN
In the paper the results of investigation on tensile stresses dependence of magnetoelastic characteristics of cores made of 13CrMo4-5 constructional steel are presented. In the investigation step-cooling test treated samples were used. The step-cooling test process is a type of heat treatment simulating effects of passing time and environmental conditions (temperature and stress) on the sample. In the paper the method of testing the influence of stresses on the magnetic characteristics is presented. Frame shaped samples ensured a closed magnetic circuit and homogeneous distribution of stress. It was found that step-cooling test does not significantly influence the magnetoelastic characteristics and the structure of the samples. On the other hand, then tensile stresses significantly change the magnetic characteristics of 13CrMo4-5 constructional steel. That confirms the possibility of using measurements based on the magnetoelastic effect in the stress assessment for industrial non destructing testing of steel constructions.
17
Content available remote

The Influence of Thermomagnetic Treatment on the Magnetoelastic Characteristics of Fe₆₁Co₁₉Si₅B₁₅ Amorphous Alloys

52%
Salach J., Szewczyk R., Svec Sr P., Bieńkowski A., Jackiewicz D., Svec P., Nowicki M., Winiarski W., Kachniarz M., Gruszecka M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
617-619
EN
Information about magnetoelastic properties of newly developed amorphous magnetic alloys is very important from practical point of view, especially in the case of high permeability materials such as the Fe₆₁Co₁₉Si₅B₁₅ amorphous alloy. In the case of such materials, effect connected with the influence of external stresses on the magnetic properties of the alloy should be tested. This paper presents experimental results of the magnetoelastic properties investigation of the Fe₆₁Co₁₉Si₅B₁₅ amorphous alloy, annealed without magnetic field as well as in the magnetic field. Such thermo-magnetic treatment generated anisotropy has significant influence on the total free energy of magnetic material. In the magnetoelastic investigation, the compressive stress was applied to the ring shaped core, perpendicularly to the magnetizing field direction. Due to the fact, that cores with closed magnetic circuits were used, demagnetization did not change the balance of total free energy in the material.
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