Dr. Stanislav Kepak Profile

Dr. Stanislav Kepak

Science and research assistant at VŠB-Technical Univ. of Ostrava

SPIE Involvement:

Author

Publications (26)

Proceedings Article | 14 May 2018 Paper

Paper

Detection of magnetic field with use of optical sensors

Jan Jargus, Martin Novak, Stanislav Kepak, Daniel Cvejn, Vladimir Vasinek, Radek Martinek

Proceedings Volume 10654, 1065419 (2018) https://doi.org/10.1117/12.2304861

KEYWORDS: Magnetism, Magnetic sensors, Sensors, Electromagnetism, Optical fibers, Iron, Signal analyzers, Optical sensors, Polarization, Power supplies

Read Abstract +

Proceedings Article | 14 May 2018 Paper

Paper

Pre-processing and extraction techniques for vital signs analysis from phonocardiographic-based interferometric fiber-optic sensor

Radek Martinek, Radana Kahankova, Nela Strbikova, Jakub Cubik, Stanislav Kepak, Marcel Fajkus, Jan Nedoma, Martin Novak, Jan Jargus

Proceedings Volume 10654, 106541E (2018) https://doi.org/10.1117/12.2304540

KEYWORDS: Heart, Interferometers, Signal processing, Optical fibers, Electrocardiography, Sensors, Wavelets, Vital signs, Interferometry, Mathematical modeling

Read Abstract +

Proceedings Article | 26 October 2017 Paper

Paper

Analysis of the influence location of the fiber optic sensor on the measurement and determination the heart rate of the human body

Jan Nedoma, Marcel Fajkus, Radek Martinek, Jakub Cubik, Stanislav Kepak, Jan Vanus, Ondrej Zboril, Vladimir Vasinek

Proceedings Volume 10440, 104400F (2017) https://doi.org/10.1117/12.2276702

KEYWORDS: Sensors, Heart, Fiber Bragg gratings, Fiber optics sensors, Polymers, Digital signal processing, Polymeric sensors, Electrocardiography, Optical fibers, Magnetic resonance imaging

Read Abstract +

Proceedings Article | 26 October 2017 Paper

Paper

Characterization and visual illustration of the consequences motion of human body for the determination of heart rate

Jan Nedoma, Marcel Fajkus, Radek Martinek, Stanislav Kepak, Jakub Cubik, Vladimir Vasinek

Proceedings Volume 10440, 104400G (2017) https://doi.org/10.1117/12.2276768

KEYWORDS: Heart, Fiber Bragg gratings, Sensors, Fiber optics sensors, Electrocardiography, Visualization, Fiber optics, Digital signal processing, Biomedical optics, Electromagnetic coupling

Read Abstract +

Proceedings Article | 26 October 2017 Paper

Paper

Noninvasive encapsulated fiber optic probes for interferometric measurement

O. Zboril, J. Cubik, S. Kepak, J. Nedoma, M. Fajkus, P. Zavodny, V. Vasinek

Proceedings Volume 10440, 104400K (2017) https://doi.org/10.1117/12.2277923

KEYWORDS: Optical fibers, Interferometry, Interferometers, Fiber optics, Fiber optics tests, Fiber optics sensors, Sensors, Photodetectors, Mach-Zehnder interferometers, Geometrical optics

Read Abstract +

Proceedings Article | 26 October 2017 Paper

Paper

Fiber optic sensor system for entrance areas monitoring

Marcel Fajkus, Jan Nedoma, Stanislav Kepak, Jakub Cubik, Jan Jargus, Ondřej Zboril, Radek Martinek, Vladimir Vasinek

Proceedings Volume 10440, 104400O (2017) https://doi.org/10.1117/12.2278222

KEYWORDS: Fiber Bragg gratings, Sensors, Fiber optics sensors, Fiber optics, Buildings, Electromagnetic interference

Read Abstract +

Proceedings Article | 26 October 2017 Paper

Paper

Bragg grating sensors for the monitoring load of production press machines

Marcel Fajkus, Jan Nedoma, Pavel Mec, Jakub Cubik, Stanislav Kepak, Jan Jargus, Martin Novak, Radek Martinek, Vladimir Vasinek

Proceedings Volume 10440, 104400P (2017) https://doi.org/10.1117/12.2278223

KEYWORDS: Fiber Bragg gratings, Sensors, Optical fibers, Fiber optics sensors

Read Abstract +

Proceedings Article | 5 October 2017 Paper

Paper

Fiber optic perimeter system for security in smart city

Jakub Cubik, Stanislav Kepak, Jan Nedoma, Marcel Fajkus, Ondrej Zboril, Martin Novak, Jan Jargus, Vladimir Vasinek

Proceedings Volume 10434, 104340U (2017) https://doi.org/10.1117/12.2278148

KEYWORDS: Defense and security, Smart sensors, Sensors, Interferometers, Fiber optics, Optical fibers, Fiber optics sensors, Light sources, Phase shifts, Electromagnetic interference

Read Abstract +

Proceedings Article | 27 April 2017 Paper

Paper

Masonry moisture measurement using the distributed temperature sensing system

David Hruby, Tomas Kajnar, Stanislav Kepak, Jakub Jaros, Jan Nedoma, Marcel Fajkus, Frantisek Perecar, Vladimir Vasinek

Proceedings Volume 10208, 1020814 (2017) https://doi.org/10.1117/12.2262511

KEYWORDS: Raman scattering, Fiber optics, Optical fibers, Sensing systems, Sensors, Temperature metrology, Distance measurement, Environmental sensing, Fiber optics sensors, Reflectometry, Temperature sensors, Nonlinear optics

Read Abstract +

Proceedings Article | 23 December 2016 Paper

Paper

Fixing methods for the use of optical fibers in interferometric arrangements

Jakub Cubik, Stanislav Kepak, Marcel Fajkus, Ondrej Zboril, Jan Nedoma, Alan Davidson, Vladimir Vasinek

Proceedings Volume 10142, 101421A (2016) https://doi.org/10.1117/12.2257060

KEYWORDS: Optical fibers, Interferometry, Fiber optics sensors, Interferometers, Acoustics, Sensors, Aluminum, Statistical analysis, Signal processing, Fiber optics

Read Abstract +

Proceedings Article | 23 December 2016 Paper

Paper

Fibre optic portable rail vehicle detector

Stanislav Kepak, Jakub Cubik, Petr Zavodny, Stanislav Hejduk, Jan Nedoma, Alan Davidson, Vladimir Vasinek

Proceedings Volume 10142, 101421M (2016) https://doi.org/10.1117/12.2257061

KEYWORDS: Sensors, Fiber optics, Fiber optics sensors, Interferometers, Demodulation, Safety, Electromagnetic coupling, Cameras, Tablets, Interfaces

Read Abstract +

Proceedings Article | 23 December 2016 Paper

Paper

Simulation of turbulences and fog effects on the free space optical link inside of experimental box

Jan Latal, Jan Vitasek, Lukas Hajek, Ales Vanderka, Petr Koudelka, Stanislav Kepak, Vladimir Vasinek

Proceedings Volume 10142, 101421O (2016) https://doi.org/10.1117/12.2257443

KEYWORDS: Fiber optic gyroscopes, Free space optics, Signal attenuation, Turbulence, Atmospheric optics, Fluctuations and noise, Thermal effects, Sensors, Distance measurement, Velocity measurements

Read Abstract +

Proceedings Article | 27 April 2016 Paper

Paper

Mathematical model of optimized design of multi-point sensoric measurement with Bragg gratings using wavelength divison multiplex

Marcel Fajkus, Jan Nedoma, Stanislav Kepak, Lukas Rapant, Radek Martinek, Lukas Bednarek, Martin Novak, Vladimir Vasinek

Proceedings Volume 9889, 98892F (2016) https://doi.org/10.1117/12.2239551

KEYWORDS: Fiber Bragg gratings, Mathematical modeling, Sensors, Optical design, Optical sensors, Channel projecting optics, Temperature metrology, Optical fibers, Refractive index, Wavelength division multiplexing

Read Abstract +

Proceedings Article | 27 April 2016 Paper

Paper

Fiber optic system design for vehicle detection and analysis

Jan Nedoma, Ondrej Zboril, Marcel Fajkus, Petr Zavodny, Stanislav Kepak, Lukas Bednarek, Radek Martinek, Vladimir Vasinek

Proceedings Volume 9889, 98892D (2016) https://doi.org/10.1117/12.2239549

KEYWORDS: Interferometers, Fiber optics, Fiber optics sensors, Signal to noise ratio, Signal processing, Optical design, Roads, Sensors, Fiber optics tests, Measurement devices, Interferometry, Photodetectors, Optical fibers

Read Abstract +

Proceedings Article | 27 April 2016 Paper

Paper

Effect of the geometric deformations on the Brillouin scattering in the standard single-mode optical fiber

Marcel Fajkus, Jan Nedoma, Stanislav Kepak, Jakub Jaros, Jakub Cubik, Ondrej Zboril, Martin Novak, Vladimir Vasinek

Proceedings Volume 9889, 98892E (2016) https://doi.org/10.1117/12.2239550

KEYWORDS: Scattering, Single mode fibers, Sensors, Temperature metrology, Optical fibers, Standards development, Distributed computing, Fiber optics sensors, Optical design, Telecommunications, Light scattering

Read Abstract +

Proceedings Article | 6 January 2015 Paper

Paper

Study of the effect of temperature on the optical connectors

Tomas Kajnar, Jan Latal, Marcel Fajkus, David Hruby, Stanislav Kepak, Vladimir Vasinek

Proceedings Volume 9450, 94500T (2015) https://doi.org/10.1117/12.2070326

KEYWORDS: Connectors, Temperature metrology, Signal attenuation, Polishing, Single mode fibers, Statistical analysis, Optical fibers, Interfaces, Thermography, Data modeling

Read Abstract +

Proceedings Article | 6 January 2015 Paper

Paper

Security risk assessment of the primary layer of wavelength division multiplexing passive optical network

Petr Koudelka, Petr Siska, Jan Latal, Radek Poboril, Lukas Hajek, Stanislav Kepak, Vladimir Vasinek

Proceedings Volume 9450, 94500U (2015) https://doi.org/10.1117/12.2070468

KEYWORDS: WDM-PON, Network security, Phased array optics, Passive optical networks, Networks, Wavelength division multiplexing, Optical networks, Time division multiplexing, Computer security, Channel projecting optics

Read Abstract +

Proceedings Article | 6 January 2015 Paper

Paper

Measurement of insulation layers using DTS system

David Hruby, Tomas Kajnar, Petr Koudelka, Jan Latal, Jan Hurta, Stanislav Kepak, Jakub Jaros, Vladimir Vasinek

Proceedings Volume 9450, 94500M (2015) https://doi.org/10.1117/12.2073555

KEYWORDS: Temperature metrology, Sensors, Optical fibers, Fiber optics, Raman scattering, Sensing systems, Fiber optics sensors, Fiber optics tests, Distance measurement, Reflectometry

Read Abstract +

Proceedings Article | 12 September 2014 Paper

Paper

Simulation of integrated optical network (IPON) properties

Petr Siska, Petr Koudelka, Jan Latal, Jan Vitasek, Stanislav Kepak, Vladimír Vašinek

Proceedings Volume 9193, 91931J (2014) https://doi.org/10.1117/12.2063015

KEYWORDS: WDM-PON, Optical networks, Networks, Optical simulations, Dense wavelength division multiplexing, Receivers, Transmitters, Eye, Integrated optics, Wavelength division multiplexing

Read Abstract +

Proceedings Article | 18 June 2014 Paper

Paper

Measurement of the microwave emitter's inhomogeneity using optical fiber DTS

Jakub Jaros, Martin Papes, Andrej Liner, Vladimir Vašinek, Pavel Smira, Andrea Nasswettrova, Jakub Cubik, Stanislav Kepak

Proceedings Volume 9098, 909815 (2014) https://doi.org/10.1117/12.2050278

KEYWORDS: Optical fibers, Microwave radiation, Temperature metrology, Raman scattering, Sensors, Electromagnetism, Raman spectroscopy, Nonlinear optics, Scattering, Antennas

Read Abstract +

Proceedings Article | 18 June 2014 Paper

Paper

Optical vibration sensor based on Michelson interferometer arrangement with polarization-maintaining fibers

Jakub Cubik, Stanislav Kepak, Andrej Liner, Martin Papes, Tomas Kajnar, Ondrej Zboril, Jakub Jaros, Vladimír Vašinek

Proceedings Volume 9098, 90980I (2014) https://doi.org/10.1117/12.2050528

KEYWORDS: Sensors, Interferometers, Michelson interferometers, Optical fibers, Polarization maintaining fibers, Mirrors, Phase shifts, Fiber optics sensors, Signal processing, Fiber optics

Read Abstract +

Proceedings Article | 3 May 2013 Paper

Paper

Detection and localization of building insulation faults using optical-fiber DTS system

Martin Papes, Andrej Liner, Petr Koudelka, Petr Siska, Jakub Cubik, Stanislav Kepak, Jakub Jaros, Vladimir Vasinek

Proceedings Volume 8774, 87741H (2013) https://doi.org/10.1117/12.2017285

KEYWORDS: Temperature metrology, Optical fibers, Raman scattering, Sensors, Raman spectroscopy, Scattering, Light scattering, Molecules, Resistance, Signal attenuation

Read Abstract +

Proceedings Article | 3 May 2013 Paper

Paper

The arms arrangement influence on the sensitivity of Mach–Zehnder fiber optic interferometer

Stanislav Kepak, Jakub Cubik, Jan Doricak, Vladimir Vasinek, Petr Siska, Andrej Liner, Martin Papes

Proceedings Volume 8774, 877415 (2013) https://doi.org/10.1117/12.2017305

KEYWORDS: Interferometers, Sensors, Acoustics, Fiber optics sensors, Phase shifts, Foam, Fiber optics, Mach-Zehnder interferometers, Polarization maintaining fibers, Modulation

Read Abstract +

Proceedings Article | 18 December 2012 Paper

Paper

Fiber Bragg Grating vibration sensor with DFB laser diode

Petr Siska, Martin Brozovic, Jakub Cubik, Stanislav Kepak, Jan Vitasek, Petr Koudelka, Jan Latal, Vladimir Vasinek

Proceedings Volume 8697, 86971P (2012) https://doi.org/10.1117/12.2010467

KEYWORDS: Fiber Bragg gratings, Sensors, Semiconductor lasers, Optical fibers, Diodes, Modulation, Refractive index, Linear filtering, Diffraction gratings, Environmental sensing

Read Abstract +

Proceedings Article | 18 December 2012 Paper

Paper

Interferometric sensor based on the polarization-maintaining fibers

Jakub Cubik, Stanislav Kepak, Jan Doricak, Vladimir Vašinek, Andrej Liner, Martin Papes

Proceedings Volume 8697, 86971O (2012) https://doi.org/10.1117/12.2005893

KEYWORDS: Sensors, Interferometers, Polarization, Polarization maintaining fibers, Fiber optics sensors, Phase modulation, Signal processing, Interferometry, Mach-Zehnder interferometers, Light sources

Read Abstract +

Proceedings Article | 7 May 2012 Paper

Paper

Mach-Zehnder interferometer for movement monitoring

Vladimir Vasinek, Jakub Cubik, Stanislav Kepak, Jan Doricak, Jan Latal, Petr Koudelka

Proceedings Volume 8370, 83700R (2012) https://doi.org/10.1117/12.919349

KEYWORDS: Interferometers, Signal processing, Mach-Zehnder interferometers, Interferometry, Optical fibers, Fourier transforms, Motion analysis, Single mode fibers, Fiber couplers, Electronic filtering

Read Abstract +

Fiber optical interferometers belong to highly sensitive equipments that are able to measure slight changes like distortion of shape, temperature and electric field variation and etc. Their great advantage is that they are insensitive on ageing component, from which they are composed of. It is in virtue of herewith, that there are evaluated no changes in optical signal intensity but number interference fringes. To monitor the movement of persons, eventually to analyze the changes in state of motion we developed method based on analysis the dynamic changes in interferometric pattern. We have used Mach- Zehnder interferometer with conventional SM fibers excited with the DFB laser at wavelength of 1550 nm. It was terminated with optical receiver containing InGaAs PIN photodiode. Its output was brought into measuring card module that performs on FFT of the received interferometer signal. The signal rises with the composition of two waves passing through single interferometer arm. The optical fiber SMF 28e in one arm is referential; the second one is positioned on measuring slab at dimensions of 1x2m. A movement of persons around the slab was monitored, signal processed with FFT and frequency spectra were evaluated. They rose owing to dynamic changes of interferometric pattern. The results reflect that the individual subjects passing through slab embody characteristic frequency spectra, which are individual for particular persons. The scope of measuring frequencies proceeded from zero to 10 kHz. It was also displayed in experiments that the experimental subjects, who walked around the slab and at the same time they have had changed their state of motion (knee joint fixation), embodied characteristic changes in their frequency spectra. At experiments the stability of interferometric patterns was evaluated as from time aspects, so from the view of repeated identical experiments. Two kinds of balls (tennis and ping-pong) were used to plot the repeatability measurements and the gained spectra at repeated drops of balls were compared. Those stroked upon the same place and from the same elevation and dispersion of the obtained frequency spectra was evaluated. These experiments were performed on the series of 20 repeated drops from highs of 0,5 and 1m. The evaluation of experiments displayed that the dispersion of measured values is lower than 4%. Frequency response has been verified with the loudspeaker connected to signal generator and amplifier. Various slabs have been measured and frequency ranges were compared for particular slab designs.

Showing 5 of 26 publications

SIGN IN TO:

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Advertisement

Advertisement