Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Karel Witas"'
Autor:
Karel Witas, Jan Nedoma
Publikováno v:
IEEE Access, Vol 10, Pp 3045-3065 (2022)
The following paper is devoted to an amplifier with gain control (Variable Gain Amplifier). The role of amplification and gain control is addressed separately from the very beginning, to achieve the greatest possible independence of the required para
Externí odkaz:
https://doaj.org/article/63d5097280fd46e98a7110921fed3180
Autor:
Radek Novak, Karel Witas
Publikováno v:
Advances in Electrical and Electronic Engineering, Vol 12, Iss 2, Pp 117-122 (2014)
The article describes the application of microcontroller PIC18F25K22 to servomechanism electronics built – in the model of car. Model is controlled optically, in the infrared part of the spectrum. Used microcontroller is optimal for this applicatio
Externí odkaz:
https://doaj.org/article/cba8cbf353ae4368b89be4187597c631
Publikováno v:
Advances in Electrical and Electronic Engineering, Vol 12, Iss 1, Pp 66-74 (2014)
The use of LED for illumination and communication together is more and more interesting with the increasing deployment of LEDs to our homes and industrial buildings. Modulation of this kind of light sources is difficult because of high voltage and cu
Externí odkaz:
https://doaj.org/article/fb7e8ac7dc954faea4e43a8fff909e36
Autor:
Karel Witas, Jan Nedoma
Publikováno v:
Applied Sciences, Vol 9, Iss 2, p 343 (2019)
In this study, we designed a mobile free space optic receiver that uses several photodetectors to provide omnidirectional receiving capability. Assuming only one transmitter, it is a receiver which builds a single input multiple output optical channe
Externí odkaz:
https://doaj.org/article/ae01da58422542e9bf0981519bbc31b3
Autor:
Rene Jaros, Jaroslav Frnda, Jakub Jalowiczor, Martin Novak, Martin Stolarik, Stanislav Zabka, Karel Witas
Publikováno v:
Integrated Optics: Design, Devices, Systems, and Applications V.
This article focuses on the analysis of the effect of long-time thermal load on the total losses of the selected fiber-optic couplers which have been thermal stressed for the thirty weeks at temperature 100 °C ± 5 °C. A total of six couplers with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::250b56f0c92568ec2eac0a08ec7c8f3d
https://doi.org/10.1117/12.2519836
https://doi.org/10.1117/12.2519836
Autor:
Rene Jaros, Martin Novak, Miroslav Pinka, Martin Stolarik, Jakub Jalowiczor, Karel Witas, Stanislav Zabka
Publikováno v:
Optical Sensors 2019.
The article describes a comparative measurement of a classical seismic sensor and a fiber-optic interferometric sensor for the perimetric applications. We created and proposed technically and financially the simplest interferometric sensor (type two-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90a92544f65a815ab91e2edbc59b76dc
https://doi.org/10.1117/12.2522309
https://doi.org/10.1117/12.2522309
Autor:
Marcel Fajkus, Vladimir Vasinek, Karel Witas, Jan Nedoma, Radek Martinek, Jan Jargus, Jan Vanus
Publikováno v:
Fiber Optic Sensors and Applications XV.
The publication describes the use of fiber-optic Bragg sensors in biomedical applications. Fiber-optic sensors are characterized by the immunity to electromagnetic interference (EMI) and by the electrical passivity. Currently, these types of sensors
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d221124dfa9eae1c037dc361593dbfec
https://doi.org/10.1117/12.2304580
https://doi.org/10.1117/12.2304580
Autor:
Jan Nedoma, Pavel Mec, Vladimir Vasinek, Radek Martinek, Marcel Fajkus, Petr Zavodny, Stanislav Hejduk, Jan Jargus, Karel Witas
Publikováno v:
Fiber Optic Sensors and Applications XV.
The article describes the use of fiber-optic interferometer in the rail transport. We proposed a measuring sensor system based on the Mach-Zehnder interferometer. The basic tracked parameter of vehicles are detection (count of vehicles). The proposed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::59963c55a354bef140dbfad91018d463
https://doi.org/10.1117/12.2304582
https://doi.org/10.1117/12.2304582
Publikováno v:
Optical Sensors 2017.
Article deal of the problematic of impact fixing optical fiber for measuring the deformation with the distributed system known as Brillouin Optical Time Domain Reflectometry (BOTDR). The measurement principle of BOTDR system based on scanning of Bril
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7fc2d9958de0072936fcd688b390ec83
https://doi.org/10.1117/12.2257065
https://doi.org/10.1117/12.2257065
Autor:
Lukas Bednarek, Martin Novak, Marcel Fajkus, Karel Witas, Ondrej Zboril, Radek Martinek, Jan Nedoma, Vladimir Vasinek
Publikováno v:
Optical Sensors 2017.
Fiber-optic sensors (FOS), today among the most widespread measuring sensors and during various types of measuring, are irreplaceable. Among the distinctive features include immunity to electromagnetic interference, passivity regarding power supply a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2820c343e6445f9b78014eb16285ce32
https://doi.org/10.1117/12.2257321
https://doi.org/10.1117/12.2257321