Mr. Michal Jelínek Profile

KEYWORDS: Calibration, Interferometers, Field programmable gate arrays, Interferometry, Sensors, Monte Carlo methods, Homodyne detection, Distance measurement, Signal processing, Signal detection, Laser interferometry

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Proceedings Article | 18 December 2018 Paper

Optical frequency transfers between ISI CAS and CESNET

Vaclav Hucl, Martin Cizek, Lenka Pravdova, Jan Hrabina, Michal Jelinek, Bretislav Mikel, Vladimir Smotlacha, Ondrej Havlis, Josef Vojtech, Josef Lazar, Ondrej Cip

Proceedings Volume 10976, 1097617 (2018) https://doi.org/10.1117/12.2518456

KEYWORDS: Fiber optics, Optical fibers, Bragg cells, Sensors, Radio optics, Doppler effect, Linear filtering, Fiber optics tests, Optical amplifiers, Temperature metrology

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Proceedings Article | 18 December 2018 Paper

Optical fibers forming to ionizing radiation sensors preparation

Michal Jelinek, Bretislav Mikel

Proceedings Volume 10976, 1097604 (2018) https://doi.org/10.1117/12.2518106

KEYWORDS: Optical fibers, Scintillation, Sensors, Ionizing radiation, Crystals, Fiber optics sensors, Etching, Fiber Bragg gratings, Signal attenuation

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Proceedings Article | 18 December 2018 Paper

Optical fiber-based ionizing sensors preparation

Bretislav Mikel, Michal Jelinek

Proceedings Volume 10976, 109760N (2018) https://doi.org/10.1117/12.2518406

KEYWORDS: Sensors, Ionizing radiation, Scintillation, Optical fibers, Scintillators, Crystals, Gamma radiation, Fiber optics sensors, Liquids, Optical sensors

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Proceedings Article | 26 June 2017 Paper

Optical fiber sensors measurement system and special fibers improvement

Michal Jelinek, Jan Hrabina, Miroslava Hola, Vaclav Hucl, Martin Cizek, Simon Rerucha, Josef Lazar, Bretislav Mikel

Proceedings Volume 10329, 1032943 (2017) https://doi.org/10.1117/12.2270251

KEYWORDS: Sensors, Control systems, Optical fibers, Laser stabilization, Fiber optics sensors, Optical filters, Optical testing, Fiber Bragg gratings, Signal attenuation, Laser interferometry

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We present method for the improvement of the measurement accuracy in the optical frequency spectra measurements based on tunable optical filters. The optical filter was used during the design and realization of the measurement system for the inspection of the fiber Bragg gratings. The system incorporates a reference block for the compensation of environmental influences, an interferometric verification subsystem and a PC - based control software implemented in LabView. The preliminary experimental verification of the measurement principle and the measurement system functionality were carried out on a testing rig with a specially prepared concrete console in the UJV Řež. The presented system is the laboratory version of the special nuclear power plant containment shape deformation measurement system which was installed in the power plant Temelin during last year.
On the base of this research we started with preparation other optical fiber sensors to nuclear power plants measurement. These sensors will be based on the microstructured and polarization maintaining optical fibers. We started with development of new methods and techniques of the splicing and shaping optical fibers. We are able to made optical tapers from ultra-short called adiabatic with length around 400 um up to long tapers with length up to 6 millimeters.
We developed new techniques of splicing standard Single Mode (SM) and Multimode (MM) optical fibers and splicing of optical fibers with different diameters in the wavelength range from 532 to 1550 nm. Together with development these techniques we prepared other techniques to splicing and shaping special optical fibers like as Polarization-Maintaining (PM) or hollow core Photonic Crystal Fiber (PCF) and theirs cross splicing methods with focus to minimalize backreflection and attenuation. The splicing special optical fibers especially PCF fibers with standard telecommunication and other SM fibers can be done by our developed techniques. Adjustment of the splicing process has to be prepared for any new optical fibers and new fibers combinations. The splicing of the same types of fibers from different manufacturers can be adjusted by several tested changes in the splicing process. We are able to splice PCF with standard telecommunication fiber with attenuation up to 2 dB. The method is also presented.
Development of these new techniques and methods of the optical fibers splicing are made with respect to using these fibers to another research and development in the field of optical fibers sensors, laser frequency stabilization and laser interferometry based on optical fibers. Especially for the field of laser frequency stabilization we developed and present new techniques to closing microstructured fibers with gases inside.

Proceedings Article | 16 May 2017 Paper

Splicing and shaping of the special optical fibers

Michal Jelinek, Vaclav Hlavaty, Jan Hrabina, Bretislav Mikel

Proceedings Volume 10231, 102311Y (2017) https://doi.org/10.1117/12.2265771

KEYWORDS: Telecommunications, Sensors, Fusion splicing, Nitrogen, Fiber optics sensors, Structured optical fibers, Fiber Bragg gratings, Optical fibers, Laser stabilization, Optical sensors, Laser interferometry, Multimode fibers, Photonic crystal fibers

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Proceedings Article | 23 December 2016 Paper

Preparation and measurement of FBG-based length, temperature, and vibration sensors

Bretislav Mikel, Radek Helan, Zdenek Buchta, Michal Jelinek, Ondrej Cip

Proceedings Volume 10142, 101420S (2016) https://doi.org/10.1117/12.2264474

KEYWORDS: Fiber Bragg gratings, Temperature metrology, Sensors, Optical testing, Fiber optics sensors, Optical fibers, Control systems, Switches, Optical filters, Structural health monitoring

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Proceedings Article | 6 January 2015 Paper

Optical fiber sensors for measurement strain and vibration

Bretislav Mikel, Radek Helan, Zdenek Buchta, Milan Holík, Michal Jelinek, Ondrej Cip

Proceedings Volume 9450, 94500G (2015) https://doi.org/10.1117/12.2070480

KEYWORDS: Sensors, Fiber Bragg gratings, Cladding, Fiber optics sensors, Optical fibers, Temperature metrology, Control systems, Optical filters, Structural health monitoring, Switches

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Proceedings Article | 22 August 2014 Paper

First setup of the optical fiber measuring system to monitoring structure health of nuclear power plant

Bretislav Mikel, Radek Helan, Zdenek Buchta, Michal Jelinek, Ondrej Cip

Proceedings Volume 9286, 92864C (2014) https://doi.org/10.1117/12.2060822

KEYWORDS: Sensors, Fiber Bragg gratings, Optical fibers, Fiber optics sensors, Temperature metrology, Control systems, Switches, Optical filters, Optical testing, Structural health monitoring

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