Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Veli-Pekka Viitanen"'
Autor:
Heini Harvela, Veli-Pekka Viitanen
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 360:566-570
The permeation rates through an ultrathin radiation entrance window membrane have been measured for several common detector gas components, as well as for some atmospheric gases, by collecting the permeated gas into a clean volume equipped with an ab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4758318b17b98c692994daaa49b3d76
https://doi.org/10.1016/0168-9002(95)00116-6
https://doi.org/10.1016/0168-9002(95)00116-6
Publikováno v:
Journal of X-Ray Science and Technology. 4:182-190
In order to fabricate entrance windows for soft x-ray detectors, various technologies have been developed. Depending on the x-ray-detector type and the environment in which the windows are used, entrance windows must meet several, often contradictory
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ef36ca8780ba72b25289b954dfde5dc5
https://doi.org/10.1016/s0895-3996(05)80056-4
https://doi.org/10.1016/s0895-3996(05)80056-4
Publikováno v:
Mutikainen, R & Nenonen, S 1994, ' Large-area pressure-enduring entrance Windows for soft X-ray regime ', Journal of X-Ray Science and Technology, vol. 4, no. 2, pp. 82-95 . https://doi.org/10.3233/XST-1994-4202
A technology capable of producing large-area pressure-tolerant x-ray entrance windows of submicrometer thickness is presented. It is based on successive tungsten griddings to support a multilayered membrane consisting of polyimide, aluminum, and alum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc4f39b748323d0529e21e0c19a14884
https://doi.org/10.3233/xst-1994-4202
https://doi.org/10.3233/xst-1994-4202
Autor:
Veli-Pekka Viitanen, Arttu Luukanen
Publikováno v:
SPIE Proceedings.
In the paper a novel passive submillimeter imaging system is presented. The operation is based on antenna-coupled microbolometer technology operating at room temperature. The demonstration system uses single pixel detector placed in the focus of a 60
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfb3a704e373010cb8036bbe9c64fd19
https://doi.org/10.1117/12.319403
https://doi.org/10.1117/12.319403
Autor:
Gerhard Ulm, Annesley C. Wright, Marcos Bavdaz, Peter J. Underwood, Peter Bulicke, Veli-Pekka Viitanen, Stefan Kraft, Roland den Hartog, A. Poelaert, Anthony J. Peacock, D. Fuchs, Frank Scholze
Publikováno v:
SPIE Proceedings.
Soft x-ray detectors for astronomical applications are often also sensitive to visible and UV photons. Filters of a new design have been developed, which could be used in future missions to suppress the flooding of x-ray detectors by low energy photo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::384de5eca0a393ec06806d9e24e96d22
https://doi.org/10.1117/12.256004
https://doi.org/10.1117/12.256004
Publikováno v:
Mechanical Properties and Deformation Behavior of Materials Having Ultra-Fine Microstructures ISBN: 9789401047753
Thin membrane structures based on polyimide-aluminum composites and beryllium are used as X-ray entrance windows. The membrane behaviour is characterized with structural simulations, pressurizations, and leak rate measurements.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::915faa814409dc70d7d70289dc064d9a
https://doi.org/10.1007/978-94-011-1765-4_21
https://doi.org/10.1007/978-94-011-1765-4_21
Autor:
Veli-Pekka Viitanen, Heikki Sipila, Panu Partanen, Seppo Arvo Anter Nenonen, Risto Mutikainen
Publikováno v:
SPIE Proceedings.
Several types of ultrathin entrance windows have been developed for applications in spaceborne X-ray instruments. Active area diameters up to 140 mm have been achieved. The latest windows developed have a transmission of > 20% at B K(alpha) and > 40%
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5ef4f292f4ece0b0d2fe13142eb492d
https://doi.org/10.1117/12.130686
https://doi.org/10.1117/12.130686
Publikováno v:
SPIE Proceedings.
Methods have been developed to make ultrathin low-leak x-ray entrance windows which can withstand atmospheric pressures. The first prototypes have been 6 mm or 20 mm diameter windows with film thicknesses 0.5 micrometers - 2.5 micrometers of polyimid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::076f280848486d322380aac48852447c
https://doi.org/10.1117/12.48324
https://doi.org/10.1117/12.48324
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