National Repository of Grey Literature 26 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Optical Fibers Forming For Optical Sensors Research
Jelínek, Michal
We present development of new methods and techniques of the splicing and shaping optical fibers with focusing to development new sensors. We developed new techniques of splicing for standard Single Mode (SM) and Multimode (MM) optical fibers and 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 minimize backreflection and attenuation. Splicing special optical fibers, especially PCF fibers with standard telecommunication and other SM fibers, can be done by light adjustment of our developed techniques.
Interferometric System for Length Calibration on a Metre Scale
Jedlička, Petr ; Mikel, Břetislav ; Řeřucha, Šimon ; Matěj, Z. ; Herman, O. ; Holá, Miroslava ; Jelínek, Michal ; Pavelka, Jan ; Číp, Ondřej ; Lazar, Josef
Interferometric system is designed to calibrate the measurement frame, used for periodic assessment of the inner geometry of the reactor active zone chassis. Calibration lenght is up to 3300mm.
Stable optical frequency transfer between ISI and CESNET workplaces
Čížek, Martin ; Pravdová, Lenka ; Hucl, Václav ; Jelínek, Michal ; Hrabina, Jan ; Řeřucha, Šimon ; Mikel, Břetislav ; Lazar, Josef ; Číp, Ondřej ; Smotlacha, V. ; Havliš, O. ; Vojtěch, J.
The contribution reports on the current state of a 306km long experimental line for transfering stable optical frequency from a telecommunication band laser standard between ISI CAS (Brno) and CESNET (Prague). The bidirectional link uses a telecommunication fiber with a dedicated DWDM window of 1540-1546 nm.1540-1546 nm. In the Czech rep. this technology can be utilized currently in two fields: remote comparisons of optical frequency standards and remote callibration of instruments (optical spectral analyzers) in industrial applications that do not allow transporting the device to a specialized laboratory. The stability of the optical frequency transfer was evaluated. A long-term measurement of transport delay was conducted. \n
Calibration of the FBG Measuring System by Laser Interferometer
Jelínek, Michal
This work deals with calibration method of the FBG based sensors and the nuclear power plant containment shape monitoring system. The design and the implementation of this system with the optical filter thermal compensation is described. The measurement of length changes is compared with the Michelson interferometer. The control system was programmed in LabVIEW.
Optical fiber sensors for measurement strain and vibration
Mikel, Břetislav ; Helán, R. ; Buchta, Zdeněk ; Holík, M. ; Jelínek, Michal ; Číp, Ondřej
We present optical fiber sensors to measurement strain and vibration. The sensors are based on fiber Bragg gratings (FBG). We prepared construction of strain sensors with respect to its implementation on the outer surface of concrete structures and with compensation of potential temperature drifts. These sensors are projected with look forward to maximal elongation and strength which can be applied to the sensor. Each sensor contains two optical fibers with FBGs. One FBG is glued into the sensor in points of fixation which are in the line with mounting holes. This FBG is prestressed to half of measurement range, than the stretching and pressing can be measured simultaneously by one FBG. The second FBG is placed inside the sensor without fixation to measure temperature drifts. The sensor can be used to structure health monitoring.
Special optical fibers and optical fiber sensors in Institute of Scientific Instruments of the CAS
Jelínek, Michal ; Mikel, Břetislav
Optical fiber sensors are applied in many industrial sectors. Great development of fiber optic sensors was focused to using fiber Brag gratings in the last years. Nowadays the primary focus is aimed to development fiber optic sensors using Raman or Brillouin scattering and microstructural fibers. Different types of optical sensors are currently used in many industrial sector from telecommunications, automotive, aerospace, oil industry to nuclear power systems and other critical infrastructures. We present our research of optical fiber sensors uses new technologies of measurements and optical fibers preparation.
Investment Plan Evaluation
Jelínek, Michal ; Nováčková, Eva (referee) ; Luňáček, Jiří (advisor)
The diploma thesis focuses on complex economic evaluation of the investment project regarding the purchase of machining centre. Based on the elaborated literature review are those findings applied to the real investment project. Economic efficiency is calculated using the identified cash flows, discount rate and static and dynamic methods. Subsequently are identified project risks and their significance. In conclusion, the results are summarized and is reported recommendation whether or not to implement the project.
Substantiation of criminal offences in traffic
Jelínek, Michal ; Jelínek, Jiří (advisor) ; Vočka, Vladimír (referee)
Summary: In the present PhD thesis I report on substantiation in the field of criminal offences committed in traffic, because this subject has been dealt with during my judgement activities performed as a judge of the district court. Substantiation is decisive especially in the proceedings at the adjudication court. Therefore this subject is exemplified by concrete cases of the present judicature and also by concrete data directly of my judicial practice. The subject comprises an extensive area because traffic criminality (or its consequences) concerns almost the whole society even under situation when traffic accidents are very frequent in the Czech Republic. Due to over 160.000 traffic accidents traffic accidents happened yearly, approximately 1 000 people die and over 25.000 persons suffer an injury during the accident. Although not every traffic accident can be considered as criminal offence, it is evident that criminal offences committed in traffic represent by their frequency a significant delinquency. The submitted PhD thesis also presents definition of basic terms of this subject, including those taken as key words in the thesis. Substantiation in the proceedings is thus a legally defined procedure of bodies responsible for penal proceedings the purpose of which is to allow these bodies to obtain...
Optical fiber sensors and optical fiber splicing
Jelínek, Michal ; Mikel, Břetislav
We present development of new methods and techniques of the splicing and shaping optical fibers. We developed new techniques of splicing for standard Single Mode (SM) and Multimode (MM) optical fibers and optical fibers with different diameters. Together with development these techniques we prepared other techniques to splicing hollow core Photonic Crystal Fiber (PCF) and theirs cross splicing methods.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.
Design of the optofiber sensor system to monitoring change of length
Jelínek, Michal ; Stehlík, Jiří (referee) ; Mikel, Břetislav (advisor)
The bachelor´s thesis deals with design and verification of optical fiber sensor system for measuring changes of length. This system is designed to shape monitoring of the nuclear power plant containment. The principle of measurement, design and realization of the first version is described in the work. Principle of measurement and functionality of the whole system was verified by measurement of specially prepared reinforced concrete console. The console was prepared in the way to simulate behaviour of containment of the nuclear power plant. Within development of system there were prepared of optical fiber sensors with Bragg´s grattings which are later used for measurement.

National Repository of Grey Literature : 26 records found   1 - 10nextend  jump to record:
See also: similar author names
22 JELÍNEK, Martin
2 Jelínek, M.
5 Jelínek, Marek
2 Jelínek, Marian
22 Jelínek, Martin
3 Jelínek, Michael
2 Jelínek, Milan
6 Jelínek, Miroslav
1 Jelínek, Mojmír
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