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Neostel collimator realization detailed optical design
Lédl, Vít; Pleštil, Jan; Psota, Pavel; Steiger, Lukáš; Václavík, Jan; Tomáš, V.
2017 - English
The aim of this document is to describe the optical design of the Alignment Collimator for the NEOSTEL telescope. The document describes proposed optical and mechanical design. It consists of several parts: Optical design and its tolerance analysis, Ghost image analysis, Stray light analysis, Mechanical design and FEM analysis.
Keywords:
collimator; FEM; alignment; telescope; optical design
Available at various institutes of the ASCR
Neostel collimator realization detailed optical design
The aim of this document is to describe the optical design of the Alignment Collimator for the NEOSTEL telescope. The document describes proposed optical and mechanical design. It consists of several ...
Surface profilometry by digital holography
Psota, Pavel; Lédl, Vít; Kaván, František; Matoušek, O.; Mokrý, P.
2017 - English
This paper presents newly developed method for measurement of surface topography based on frequency scanning digital holography. Digital holography allows for direct computation of the phase field of the wavefront scattered by an object. A tuning of the light source optical frequency results in linear phase variation with respect to the optical frequency. Slope of the linear function in every single pixel corresponds to absolute measurement of optical path difference and thus topography map of the surface can be retrieved. Principle of this contactless method is introduced and experimentally verified. The method can be used for measurement of complex geometries of common manufacturing parts as well as for topography measurement of complex composite structures, and active acoustic metasurfaces.
Keywords:
Surface profilometry; Digital holography; Frequency scanning; Absolute measurement
Available at various institutes of the ASCR
Surface profilometry by digital holography
This paper presents newly developed method for measurement of surface topography based on frequency scanning digital holography. Digital holography allows for direct computation of the phase field of ...
CNT composite - polishing methods and metalic coating
Thoř, Tomáš; Václavík, Jan; Vápenka, David
2017 - English
This study summarizes R&D tasks done in order to develop technology for polishing and metallic coating of CNT composite for optical and radiofrequency applications. Development was done on two types of material samples:\n- Material for the MIRROR demonstrator\n- Material for the FEEDHORN demonstrator
Keywords:
polishing; cnt composite; metallic coating
Available at various institutes of the ASCR
CNT composite - polishing methods and metalic coating
This study summarizes R&D tasks done in order to develop technology for polishing and metallic coating of CNT composite for optical and radiofrequency applications. Development was done on two types ...
Mechanical properties of plasma sprayed layers of NiAl10 and NiAl40 on AZ91 alloy
Kubatík, Tomáš František; Brodil, R.; Ctibor, Pavel; Průša, F.; Brožek, Vlastimil
2017 - English
In this work, plasma coatings of NiAl10 and NiAl40 on magnesium alloy AZ91 substrate were prepared by the hybrid plasma spraying system WSP®-H 500. The both plasma sprayed coatings of NiAl10 and NiAl40 have metallurgical bond. The thicknesses of microstructures in the cross-section of NiAl10 and NiAl40 plasma sprayed coatings prepared by 9 passes were 374 and 440 μm respectively. Adhesion test of plasma sprayed layers was performed using a modified ASTM C 633 standard. The tensile adhesion strength values are 24.7 MPa for NiAl10 coatings and 12.3 MPa for NiAl40 coatings. Abrasion resistance according to Slurry Abrasion Response (SAR) test of NiAl40 layers had similar values (0.12 g/cm2)in a comparison with the uncoated AZ91 (0.126 g/cm2). Layers NiAl10 had greater weight losses (0.175 g/cm2) than uncoated AZ91. Microhardness of plasma coating of NiAl40 is several times greater than microhardnesses of plasma coating of NiAl10 and uncoated substrate AZ91
Keywords:
Adhesion strength; Nickel alloys; Plasma spraying; Wear resistance
Available at various institutes of the ASCR
Mechanical properties of plasma sprayed layers of NiAl10 and NiAl40 on AZ91 alloy
In this work, plasma coatings of NiAl10 and NiAl40 on magnesium alloy AZ91 substrate were prepared by the hybrid plasma spraying system WSP®-H 500. The both plasma sprayed coatings of NiAl10 and ...
Microwave reflectometry for density profile and turbulence measurements on the COMPASS tokamak.
Bogár, Ondrej; Bílková, Petra; Böhm, Petr; Hron, Martin; Pánek, Radomír; Silva, A.; Zajac, Jaromír; Varavin, Mykyta
2017 - English
Microwave reflectometry is an established radar technique to acquire various scientific results in plasma fusion research. Fast electron density profile measurements are crucial for the study of fusion plasmas and the operation of fusion devices. Operation capability and first results of the reflectometry on the COMPASS tokamak are presented in this contribution.
Keywords:
plasma; tokamak; COMPASS
Fulltext is available at external website.
Microwave reflectometry for density profile and turbulence measurements on the COMPASS tokamak.
Microwave reflectometry is an established radar technique to acquire various scientific results in plasma fusion research. Fast electron density profile measurements are crucial for the study of ...
Large displacement and deformation measurement by frequency sweeping digital holography
Psota, P.; Lédl, Vít; Kaván, František; Matoušek, O.; Doleček, R.
2017 - English
Recently, a digital holographic method called Frequency Sweeping Digital Holography (FSDH) for high precision measurements of surface topography of mechanical parts has been introduced. The greatest advantage of the presented FSDH is the fact that the measurement is absolute. i.e. optical path difference is independently retrieved in every single pixel. This approach can therefore be used also for measurement of large displacements and deformation. FSDH is particularly suitable in cases where the common digital holographic methods fail due to e.g. 2π unambiguity problem or speckle decorrelation. Measurement method principles, setup details, an some features of the method are discussed.\n
Keywords:
Digital holography; Digital holographic interferometry; Displacement measurement; Absolute measurements
Available at various institutes of the ASCR
Large displacement and deformation measurement by frequency sweeping digital holography
Recently, a digital holographic method called Frequency Sweeping Digital Holography (FSDH) for high precision measurements of surface topography of mechanical parts has been introduced. The greatest ...
Methodology of camera spectral response measurement
Melich, Radek; Václavík, Jan; Žídek, Karel
2016 - English
Spectral response of the camera will be measured using monochromator in conjunction with an integration sphere. Camera without objective will be placed in one port of the integrating sphere and light beam from monochromator will be fed into perpendicular port. Sensor of the camera sensor will be therefore uniformly illuminated by diffused light from monochromator. Proposed FWHM of the monochromator is 15 nm as a trade-off between light intensity provided by monochromator and deformation of spectral characteristic (Picture XY). Diameter of the integrating sphere has to be larger than 100 mm to ensure uniform illumination over sensor area.
Keywords:
Camera spectral response
Available at various institutes of the ASCR
Methodology of camera spectral response measurement
Spectral response of the camera will be measured using monochromator in conjunction with an integration sphere. Camera without objective will be placed in one port of the integrating sphere and light ...
Evaluation of selected parameters of a LIBA2000 glass melt according to ISO 12123.
Václavík, Jan
2016 - English
Measurement of refractive indices of samples, specifically refractive indicies nd, ne and Abbe numbers for spectral lines d and e. Assesment of refractive index variation, internal spectal transmitance and amount of striae in samples.\n
Keywords:
glass melt; ISO 12123; striae; refractive index; inhomogeneity
Available at various institutes of the ASCR
Evaluation of selected parameters of a LIBA2000 glass melt according to ISO 12123.
Measurement of refractive indices of samples, specifically refractive indicies nd, ne and Abbe numbers for spectral lines d and e. Assesment of refractive index variation, internal spectal ...
Device calibration.
Melich, Radek; Václavík, Jan; Žídek, Karel
2016 - English
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.
Keywords:
absolute brightness calibration
Available at various institutes of the ASCR
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 - English
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.
Keywords:
METIS M0 mirror
Available at various institutes of the ASCR
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.
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