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Device calibration.
Melich, Radek; Václavík, Jan; Žídek, Karel
2016 - anglický
The device has to be calibrated in absolute terms for its brightness response. This will be facilitated by a combination of an integrating sphere and collimating objective. The emitted total light intensity will be controlled by a reference photodiode inside the integrating sphere.
Klíčová slova:
absolute brightness calibration
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Device calibration.
The device has to be calibrated in absolute terms for its brightness response. This will be facilitated by a combination of an integrating sphere and collimating objective. The emitted total light ...
METIS mirror M0 FS
Lédl, Vít; Melich, Radek; Vít, Tomáš
2016 - anglický
Scope of the document is to provide required test results with respect to the structure of M0 mirror, FS version. The mirror has a unique numbering M0-C17-20.
Klíčová slova:
METIS M0 mirror
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
METIS mirror M0 FS
Scope of the document is to provide required test results with respect to the structure of M0 mirror, FS version. The mirror has a unique numbering M0-C17-20.
PROBA3 Coronograph System Progress Report
Horodyská, Petra; Melich, Radek
2016 - anglický
The scope of this document is to provide to CSL and ESTEC a progress report of ongoing activities as described in Project Management Plan v1_1. TOPTEC main activities cover realization of coronagraph optical elements, housing for this elements, HDD and the Lyot stop realization. In year 2016, the DM model was finished and delivered and the STM model was competely realized and delivered. Toptec started to prepare the documents for Critical Design Review (CDR).
Klíčová slova:
coronagraph optical elements; housing; HDD; Lyot stop; DM; STM
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
PROBA3 Coronograph System Progress Report
The scope of this document is to provide to CSL and ESTEC a progress report of ongoing activities as described in Project Management Plan v1_1. TOPTEC main activities cover realization of coronagraph ...
METIST mirror M1 FS
Lédl, Vít; Melich, Radek; Vít, Tomáš
2016 - anglický
Scope of the document is to provide required test results with respect to the structure and optical performance of individual optical surfaces of M1 mirror, FS version. The mirror has a unique numbering M1-C20-23.
Klíčová slova:
METIS mirror M1 FS
Plné texty jsou dostupné na vyžádání prostřednictvím repozitáře Akademie věd.
METIST mirror M1 FS
Scope of the document is to provide required test results with respect to the structure and optical performance of individual optical surfaces of M1 mirror, FS version. The mirror has a unique ...
Black Chromia Plating for the Solar Radiation Absorbers
Brožek, Vlastimil; Březina, Václav; Brom, Petr; Kubatík, Tomáš František; Vilémová, Monika; Mastný, L.; Novák, M.
2016 - anglický
Black chromia layers were produced on copper, zirconium and aluminium substrates. These layers are aimed to serve as solar collectors. Efficiency of the layers during UV-VIS, UV radiation and WSP® plasma torch radiation is described. The chromia layers were prepared by a new procedure, i.e. deposition of ammonium dichromate solution using plasma torch or so called Liquid Precursor Plasma Spraying (LPPS). Solution of ammonium dichromate is fed into plasma stream, where dissociation takes place under temperatures of 4000 K – 25000 K. Up to nanometric oxide particles can be produced; the resulting size is dependent on solution concentration and feeding nozzle diameter. The particles impact on substrate and form coating. Using 2 wt.% to 5 wt.% solution of ammonium dichromate and feeding nozzle of 0.2 mm in diameter is the size of produced chromia particles about 6 µm which results in formation of 2 µm to 3 µm thick coating, i.e. according to the theory an optimal thickness 2.5 um for absorption layers, necessary condition for formation energy traps for IR radiation emitters up to 100°C. Moreover, black chromia coating is a suitable corrosion barrier of metallic substrates. \n\n
Klíčová slova:
Solar collector; black chromia; plasma spraying; ceramic coatings
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Black Chromia Plating for the Solar Radiation Absorbers
Black chromia layers were produced on copper, zirconium and aluminium substrates. These layers are aimed to serve as solar collectors. Efficiency of the layers during UV-VIS, UV radiation and WSP® ...
Black Chromia Coatings on Metal Tubes for the Solar Collectors
Brožek, V.; Mastný, L.; Novák, M.; Vilémová, Monika; Kubatík, Tomáš František
2016 - anglický
This paper describes the results of the first phase of the study preparation, structure and properties of coatings modification of black chromium oxide on copper, aluminium, iron and zirconium tubes for solar collectors. The coatings are prepared by plasma spraying of liquid chromate method which is known as liquid precursor plasma spraying. Coatings have the function of an energy trap for thermal radiation wavelengths of 1 μm – 3 μm i.e. in the IR region. At the same time, the coating increases the corrosion resistance of metal substrates. The nanometric structure and thickness of the coating depend of the feeding distance and the concentration of chromate precursors. For the deposition of nanometric splats of melt chromiumIII oxide, a new type of feeder that injects precursors into the water stabilized thermal plasma produced by the WSP® generator has been\ndeveloped.\n
Klíčová slova:
Solar collector; black chromia; plasma spraying; suspension spraying
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Black Chromia Coatings on Metal Tubes for the Solar Collectors
This paper describes the results of the first phase of the study preparation, structure and properties of coatings modification of black chromium oxide on copper, aluminium, iron and zirconium tubes ...
Spectroscopic Study of Underwater Electrical Discharge Generated by Nanosecond Pulses.
Pongrác, Branislav; Šimek, Milan; Babický, Václav; Člupek, Martin; Lukeš, Petr
2016 - anglický
Underwater electrical discharge generated by high voltage pulses with nanosecond duration (~110 kV amplitude on the needle, ~5 ns duration (FWHM), 1 Hz repetition rate) has been investigated. Time–resolved optical emission spectroscopy showed different emission spectra profile of the ns–pulsed discharge compared to the μs–pulsed discharges investigated previously. Some characteristic peaks typical for water discharges (Hα, OI) were clearly visible in the spectra. In addition, the integral light emission of the discharge was recorded by photomultiplier tube.
Klíčová slova:
nanosecond discharge; water discharge; time-resolved emission spectroscopy
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Spectroscopic Study of Underwater Electrical Discharge Generated by Nanosecond Pulses.
Underwater electrical discharge generated by high voltage pulses with nanosecond duration (~110 kV amplitude on the needle, ~5 ns duration (FWHM), 1 Hz repetition rate) has been investigated. ...
Gap – gep – mezera?
Obdržálek, J.; Bílková, Petra; Mlynář, Jan
2016 - český
Jsou prezentovány obecné terminologické obtíže v odborném jazyce fyziky kontinua. Zvláště se příspěvek zabývá výhodami a nevýhodami velkého vlivu angličtiny z hlediska grafického (typologického) a fonetického. They presented the general terminological difficulties in technical language continuum physics. In particular it deals with the advantages and disadvantages of the great influence of English in terms of graphical (typological) and phonetic
Klíčová slova:
phonetics; typology
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Gap – gep – mezera?
Jsou prezentovány obecné terminologické obtíže v odborném jazyce fyziky kontinua. Zvláště se příspěvek zabývá výhodami a nevýhodami velkého vlivu angličtiny z hlediska grafického (typologického) a ...
Corrosion behavior of plasma coatings CuAl10 and CuAl50 on magnesium alloy AZ 91
Kubatík, Tomáš František; Stoulil, J.; Stehlíková, K.; Slepička, P.; Janata, Marek
2016 - anglický
The most common magnesium alloy AZ 91 is widely used as a structural material, but its use is limited at higher temperatures and high humidity. Plasma spraying is a technology that allows to prepare protective metallic and non-metallic coatings on a wide variety of substrates including magnesium and its alloys. In this study, CuAl10 and CuAl50 were plasma sprayed on magnesium alloy AZ 91 with the aim to study corrosion resistance of the plasma sprayed coatings. The corrosion resistance of layers was evaluated by the method of electrochemical potentiodynamic measurement as well as long-term corrosion tests in a condensation chamber with 0.5 mol\nNaCl at the temperature of 35 °C for 1344 hours. Layers with 1, 2, 5 passes and passes of CuAl10 with the thickness ranging from 75 to 716 mm and CuAl50 with the thickness ranging from 64 to 566 mm were prepared. The increased corrosion velocity was observed in the case of thin layers of 2 and 5 passes due to the development of a galvanic corrosion couple. The CuAl10 layer prepared with ten passes has an outstanding corrosion resistance.
Klíčová slova:
magnesium alloy AZ 91; plasma spraying; corrosion resistance
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Corrosion behavior of plasma coatings CuAl10 and CuAl50 on magnesium alloy AZ 91
The most common magnesium alloy AZ 91 is widely used as a structural material, but its use is limited at higher temperatures and high humidity. Plasma spraying is a technology that allows to prepare ...
Deposition of Titania from Solution by Hybrid Water-Stabilized Plasma Torch
Mušálek, Radek; Medřický, Jan; Tesař, Tomáš; Kotlan, Jiří; Lukáč, František
2016 - anglický
Thermal spraying with liquid feedstock presents a novel route for deposition of functional coatings. In this study, possibility of preparation of titania coatings from solution by hybrid water stabilized plasma torch is presented. Coatings were prepared from solution of titanium isopropoxide Ti[OCH(CH3)2]4 in anhydrous ethanol. Fragmentation of feedstock stream in the plasma jet was monitored by shadowgraphy. Deposition was carried out on steel samples mounted to the cooled rotating carousel. Cross-sectional images from SEM microscope showed successful formation of the deposit with dual morphology consisting of fine feather-like features combined with bigger droplets. X-ray diffraction revealed formation of nanometric rutile crystallites.
Klíčová slova:
Thermal spraying; plasma spraying; titania; solution; liquid feedstock
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Deposition of Titania from Solution by Hybrid Water-Stabilized Plasma Torch
Thermal spraying with liquid feedstock presents a novel route for deposition of functional coatings. In this study, possibility of preparation of titania coatings from solution by hybrid water ...
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