National Repository of Grey Literature 7 records found  Search took 0.02 seconds. 
A Wide-Angle Photographic Camera of James G. Baker With the Paraboloidal Mirror
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan ; Vápenka, David ; Tomka, David ; Thoř, Tomáš ; Pintr, Pavel ; Macner, David
A field of view of the paraboloidal mirror is small. Dominant aberration which limits its angular diameter is coma. Using correctors consisting lenses and aspherical plates star images of the mirror systems can be radically corrected. In this paper we present optical design of such photographic camera computed by James G. Baker. His device is composed of a paraboloidal mirror, a cemented dublet in front of focus and an aspherical plate placed in entrance parallel beam.
Residual Aberrations of the Gajdušek Objective Lens of Diameter 200 mm and Focal Length 3480 mm of the Observatory in Hradec Králové
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan ; Vápenka, David ; Tomka, David ; Thoř, Tomáš ; Macner, David
The achromatic dublet of diameter 200 mm and focal length 3480 mm was manufactured by Professor ing. Vilém Gajdušek in Ostrava in 1954. The telescope with this objective is placed at the Observatory and planetarium in Hradec Králové. The objective was restored in the Institute of Plasma Physics, v.v.i.-Centrum Toptec in Turnov. During the process lens was measured and data were used for evaluation of its residual aberrations. We present the results of the measurement in this paper.
The Technology of Manufacture of a Positive Lens of Achromatic Dublet
Rail, Zdeněk ; Melich, Zbyněk ; Šrajer, Bohdan ; Šípová, Gabriela ; Ulrichová, Iva ; Franců, Helena ; Melich, Radek ; Vápenka, David ; Tomka, David ; Thoř, Tomáš
This paper deals with manufacturing of a positive lens of achromatic dublet. Diameter of the dublet is 158 mm and its focal length about 2500 mm. The glass material of the former lens was inhomogeneous and the dublet provided bad images. This is why we decided to manufacture new lens. The process was made by means of former machines of our workshop. The telescope with this dublet is placed at the Observatory of Turnov and serves for public astronomical observation.
Study on polishing of CaF2 plane-parallel elements
Procháska, František ; Thoř, Tomáš ; Šípová, Gabriela
Determination of technological procedure for processing of plane-parallel and plano-convex CaF2 optical elements. That includes optical polishing as well as preparation of samples for polishing, i.e. cementing and grinding.
CNT composite - polishing methods and metalic coating
Thoř, Tomáš ; Václavík, Jan ; Vápenka, David
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
NATAP – polishing of CNT composites
Thoř, Tomáš
Examined samples are of carbon composite material composed of a cyanoester resin (matrix), carbon fibers (in the form of a fabric) and a carbon nanotube layer (in the form of a piece of paper). The report contains a description of the development of polishing such material on a PU polishing pad in combination with a CeO2 slurry.
Study on polishing of ZnSe with diamond suspension
Procháska, František ; Thoř, Tomáš
Observe the effect of diamond slurries as polishing element on ZnSe, i.e. observe the change of surface of ZnSe as consequence to the series of polishing with the use of mentioned diamond slurries.

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