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1
Content available Apparatus for the Measurement of Electromagnetic Activity of Landslides
Maniak Krzysztof, Mydlikowski Remigiusz
Advances in Science and Technology. Research Journal
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2023
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Vol. 17, no 3
184--195
EN
The article presents a new research apparatus for measuring the electromagnetic activity of landslides. The basic element of the apparatus is a highly sensitive underground receiver of the magnetic component of the EM field. Such a receiver inserted to the full depth of a landslide well records the levels of magnetic field amplitude at a given depth. Anomalous levels of the magnetic component indicate the existence of landslide slip planes. Combining several receivers into a measurement system will enable continuous monitoring of landslide activity. The article presents examples of studies using the discussed apparatus, which were carried out on real landslides.
2
Content available Działalność laboratorium radiointroskopii przy Wydziale Elektroniki Politechniki Wrocławskiej
Mydlikowski Remigiusz, Maniak Krzysztof
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
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2022
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Nr 74
61--64
PL
W artykule przedstawiono historię laboratorium radiointroskopii stworzonego przy Politechnice Wrocławskiej. Laboratorium w swojej ponad 50 letniej historii zajmowało się badaniami pól elektromagnetycznych emitowanych przez skały oraz grunt poddawanych mechanicznym naprężeniom. Laboratorium skupia się na budowie prototypowej aparatury badawczej i pomiarach polowych. Realizacja tematyki radiointroskopii zwieńczona jest wieloma publikacjami, 16 patentami, 4 doktoratami i 2 pracami habilitacyjnymi. Laboratorium kontynuuje swoje badania do dnia dzisiejszego, poszukując nowych dziedzin badawczych wykorzystania fal elektromagnetycznych w zastosowaniach nietelekomunikacyjnych.
EN
The paper presents the history of the radiointroscopy laboratory established at the Wroclaw University of Science and Technology. The laboratory in its over 50 years of history dealt with the study of electromagnetic fields emitted by rocks and soil subjected to mechanical stress. The laboratory focuses on building prototype research apparatus and field measurements. The implementation of the radiointroscopy subject matter is crowned with many publications, 16 patents, 4 doctorates and 2 habilitation theses. The laboratory continues its research to this day, seeking new research areas of application of electromagnetic waves in non-telecom applications.
3
Content available Research Concerning Electro magnetic Emissions from Residential On-grid PV Systems
Maniak Krzysztof, Sobolewski Janusz, Tomczyk Tomasz, Spalt Karolina, Wroński Jacek
Journal of Telecommunications and Information Technology
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2021
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nr 4
23--31
EN
The paper presents the results of grid power quality tests and wide frequency electromagnetic radiation level tests to which home power networks with photovoltaic systems have been subjected. The said results are meaningful from the point of view of safety and compatibility of electrical devices and the power supply system they are connected to. The tests covered stability of phase voltage and its frequency, harmonic level flicker, as well as RF radiated and emission levels. The measurements performed provide an answer to the question concerning the level of compliance of randomly selected home-installed PV systems with applicable recommendations and regulations concerning electromagnetic compatibility. The ability to meet the applicable standards translates into the health and safety of building inhabitants, which is the ultimate goal. Legal regulations concerning electromagnetic compatibility of renewable energy sources are consistent throughout the entire European Union.
4
Content available Dynamics of autonomous rock electromagnetic radiation measurement instrumentation
Mydlikowski Remigiusz, Maniak Krzysztof
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2021
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Vol. 69, nr 5
art. no. e138567
EN
The paper analyzes the operation of innovative composite measurement instrumentation for spontaneous electromagnetic emission. The designed receiver measures and records both components of the EM field emitted by rocks subjected to increased mechanical stress. The range of signals transmitted by the receiver system and its dynamics were determined. A receiver was used to observe electromagnetic signals generated during a hard coal sample crushing in laboratory conditions. Test results confirmed the high dynamic range of the system at 98 dB and the ability to observe signals over a range of frequencies up to 50 kHz. The experimental results confirm the signal bandwidth characteristic of coal mine EM field emission obtained in earlier studies. The constructed autonomous receiver can be used in mine workings as a complementary warning system for emerging mine hazards.
5
Content available Autonomous Instrumentation for Measuring Spontaneous Electromagnetic Emissions in Mining
Maniak Krzysztof, Mydlikowski Remigiusz
Journal of Telecommunications and Information Technology
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2020
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nr 4
98--103
EN
This article presents the design of an innovative receiver capable of identifying electric and magnetic components of electromagnetic fields. The receiver senses and records electromagnetic disturbances generated as mine tunnels collapse. It offers excellent operating specification and the ability to sense and log magnetic and electrical component strength values in real time. The paper analyzes the data obtained with the use of a system installed in a working mine and attempts to determine hazards resulting from increased rock stress levels that, cause spontaneous EM emissions.
6
Content available Measurement of Electromagnetic Field Component Emissions as a Precursor of Emerging Hazard in Coal Mines
Mydlikowski Remigiusz, Maniak Krzysztof
Journal of Telecommunications and Information Technology
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2019
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nr 4
30--35
EN
The article presents the results of research concerning electromagnetic (EM) field emitted by rocks during the process of their destruction. The paper describes a measuring stand designed for subjecting rock samples to axial crushing. During the destruction of rock samples, both components of the electromagnetic field emitted by the rock were recorded. The paper presents the results of research on hard coal samples, presenting the obtained time domain waveforms and frequency spectrum of the emitted EM field components. Further potential uses of tests concerned with EM emitted by rocks are determined. Applications registering EM field in mine environments may provide an early mine collapse warnings.
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