- Non-destructive testing of historical artifacts
- Methods of X-ray microtomography
- BioLab-P measuring system
- System for measurement of the thermal resistance of aluminium heat sinks
Result 1: Non-destructive testing of historical artifacts
Projects: -
Authors: M. Hain, V. Jacko, J. Bartl
In order to apply the results of our research and in collaboration with the restorer academic painter Miroslav Surin we have used several optical non-destructive methods - infrared reflectography, ultraviolet fluorescence and infrared thermography for testing of cultural heritage artifacts - the wall paintings in Bratislava castle before and during the reconstruction of it.
This unique artifact withstood the devastating fire, which affected the Bratislava Castle in the past, because the oriel was covered in ancient times by a wall and therefore is kept in relatively good condition until today.
Use of infrared reflectography and digital image processing allowed the dotted underdrawings visualisation. Underdrawings were drawn by painters on the wall before painting, and they are valuable information for restorers and testimony of any changes in the compositions of the murals.
Use of ultraviolet fluorescence with digital image processing allowed visualisation of later over-paintings and retouching of murals.
Applicator: Restorers of the Bratislava castle.
Fig. 1. Visualization of the interventions into a wall painting in a renaissance bow-window in Bratislava castle (renewed by artist M. Šurín). Left: Painting in the visible radiation. Right: Reflectogram in the near IR spectrum
Fig. 2. Visualization of a dotted under-painting (left) of a wall painting (right) in a renaissance bow-window in Bratislava castle using the IR reflectography (renewed by artist M. Šurín)
Result 2: Methods of X-ray microtomography
Projects: -
Authors: M. Hain, J. Bartl, R. Ševčík, V. Jacko
As part of the project VEGA
"Progressive methods of
measurement and non-destructive
testing - active infrared thermography and
X-ray microtomography" as well as within the
project of the Structural funds "CEKOMAT "
the methodology of an optimized 3D visualization of internal structures of selected objects
in the field of materials research, microelectronics,
electronics, mechatronics, mineralogy,
geology and biology has been proposed. The
effect of spectral composition of the X-ray radiation on
the optical contrast of X-ray projections was theoretically analyzed. Alpha
Further, the control options of the spectral composition using
accelerating voltage in the X-ray
tube, choice of material of targets (tungsten, molybdenum) and an X-ray beam
filtration were analyzed.
They were also developed methods of 3D
visualization of microstructures and
image segmentation; and the possibilities of
metrological calibration of the microtomograph for the
purposes of measurement of internal structures were analyzed.
The achieved results were
verified experimentally, presented at conferences and published in periodicals.
Alpha
The applicator: research results are used for
optimization of X-ray microtomographic techniques
and are applied in
cooperation with other institutes,
universities and industry.
Fig. 1. Visualization of inhomogeneities in a composite material using methods of the RTG microtomography.
Publications:
- HAIN, M. - NOSKO, M. - SIMANČÍK, F. - DVORÁK, T. - FLOREK, R.: Možnosti využitia RTG mikrotomografie v oblasti charakterizácie kovových materiálov. Zváranie 60, 2011, No.1-2, p.30-32.
- BARTL, J.- HAIN, M.: Použitie röntgenovej mikrotomografie pri nedeštruktívnom vyšetrovaní. Metrologické listy, 34, 2011, No.2, p.55-62.
Result 3: BioLab-P measuring system
Projects: VEGA 2/0210/10, APVV 0513-10
Authors: P. Kaľavský, V. Rosík, S. Karas, M. Tyšler
Measuring system for acquisition, processing and evaluation of ECG signal, blood and perfusion pressure and drug dosage was designed. Mentioned signals are recorded during farmacological experiments on hearts of small animals using the Langendorff apparatus. The system consists of necessary biosignal sensors, a measuring unit and a control computer with the application software. The novelty of the approach presented are both, hardware of the measuring unit based on the DT9812-10V acquisition module (Data Translation) that allows communications with the control computer via an USB interface and also the purposeful compound architecture of the application software. For real-time signal processing, LabVIEW was used because of the simplicity of parallel algorithms implementation, for the off-line analysis of biophysical parameters MATLAB was chosen. During the development of the measuring application, special attention was devoted to design of parallel software architecture that reflects current trends in development of processors and enables optimal use
of the performance of multicore computing systems. The measuring system is intended for pharmacological and medical research and is supposed to be used at the Institute of Pathophysiology at the Faculty of Medicine, Comenius University in Bratislava.
Fig. 1. Block diagram of the modular multiple-loop application framework of the proposed measuring application. The diagram consists of the Event-Handling Loop for processing GUI activity, the Data Acquisition Loop for acquisition of sampled data from the acquisition unit, the Displaying Loop for visualization of measured biosignals, the Recording Loop for saving row data to disk and the queue-based messaging scheme that accomplishes synchronization and transmission of data between the loops.
Publications:
-
KAĽAVSKÝ, Peter - ROSÍK, Vladimír - KARAS, Slavomír - TYŠLER, Milan. Measuring system with compound software architecture for measurement and evaluation of biosignals from isolated animal hearts. In MEASUREMENT 2011 : Proceedings of the 8th International Conference on Measurement - Bratislava : Institute of Measurement Science SAS, 2011. ISBN 978-80-969-672-4-7, p. 379-382.
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KAĽAVSKÝ, Peter - ROSÍK, Vladimír - KARAS, Slavomír - TYŠLER, Milan. Merací systém na merania a vyhodnocovanie biosignálov z izolovaných sŕdc malých zvierat. Trendy v biomedicínskom inžinierstve : Zborník 9. česko-slovenskej konferencie - Rožnov pod Radhoštěm : VŠB - Technická univerzita Ostrava, 2011. ISBN: 978-80-248-2475-8, s. 115-118.
Result 4: System for measurement of the thermal resistance of aluminium heat sinks
Projects: -
Authors: M. Hain, V. Jacko, J. Bartl
In the frame of applied research project aimed at the support of
domestic industry, the methodology and automated measurement system for the
measurement of thermal resistance of aluminum heat sinks used in electronic and
electrical industries has been designed and developed. Designed and implemented
measurement system is composed of measurement unit, temperature sensors
(thermocouples and platinum resistance sensors), heat source, and personal
computer with specialized measuring and evaluation software developed at IMS
SAS. The measuring
system enables the measurement of thermal resistance of heat sinks in the
dissipation range from 0 to 500 W. The measurement is automated and measured data are
real-time mathematically processed, evaluated and presented on the PC screen in
numeric and graphic form. In the context of a measurement method proposal, a
detailed analysis of sources of measurement uncertainty in the measurement
chain was carried out and the uncertainties of type A and B were evaluated. Subsequently the
relative combined expanded uncertainty of thermal resistance U = 0.7% (k = 2)
was evaluated. The methodology and the developed measuring system has been successfully
used for the measurement of thermal resistance of aluminum heat sinks of
manufacturer GAMAalumínium Ltd. Žiar nad Hronom, which was the customer of the
results of this applied research.
Economic profit 1875 EUR
Fig. 1. View of the measuring system and the user interface of the program for measuremente of the thermal resistance of aluminium heat sinks
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Selected Results 
