Vakuum in Forschung und Praxis

Aktuelle Ausgabe - Volume 30 Issue 3 (June/July 2018)

Titelbild

Editorial

Hauptsache dicht!

  • Lisa Kleinen
  • Seite 3-3

Inhalt

Magazin

Vakuum

Moderne Lecksucher mit Vakuumtechnik

Summary Modern leak detectors in vacuum technology In many areas of industrial manufacturing, quantitative leak tightness measurements are required in order to analyze product quality. This article examines three approaches to vacuum leak testing, which utilize different measuring principles and completely different working pressures. The processes are divided into “non‐gas selective”, “single gas selective” and “double...

  • Daniel Wetzig
  • Seite 16-20

Normen für Lecksuche und Dichtheitsprüfung

Summary Standards for leak detection and leak testing This article summarizes national and international standards of relevance for leak detection and tightness control. Content of regulations of special interest for vacuum technology is presented. In addition, regulations are introduced which are of relevance for industrial tightness control.

  • Rudolf Konwitschny
  • Seite 21-25

Bestimmung von Ausgas‐ und Desorptionsraten mittels Restgasanalysator

Summary Determination of Outgassing and Desorption Rates by Means of Residual Gas Analysis Especially when using plastic materials in vacuum chambers it is essential to know the amount of gases outgassing from the surface of those materials. Depending on the so‐called outgassing or desorption rate one can decide if the proposed plastic material is suited for the desired application and how the vacuum system has to be...

  • Heinz Barfuss, Frank Pfeifer
  • Seite 26-31

Plasma

Plasma jet cleaning of optics

Summary Optical components used in normal ambient conditions are usually contaminated by hydrocarbons from the ambient air in the course of time. This contamination gives rise to a decrease in the particular optical performance, i.e. the reflectance of mirrors or the transmittance of lenses and windows. In order to address this issue, the impact of ageing at ambient conditions as well as subsequent plasma cleaning on relevant...

  • Christoph Gerhard, Lars ten Bosch
  • Seite 32-35

Vakuum

Accelerated testing of powerful electrovacuum devices

Summary In this paper the factors influencing the service life of powerful generating lamps are considered. Possibilities of accelerated testing of the devices with the purpose of saving time and resources are described. The methodology and design of the research stand for accelerated testing are presented. Results of a study of the processes of mutual diffusion of the materials of the grid mesh and antiemission coating are shown....

  • A. A. Lisenkov, E. D. Pryalukhin, D. K. Kostrin
  • Seite 36-40

Dünne Schichten

Neutronen für die Analyse von Wasserstoff in Festkörpern

Summary Neutrons for the analysis of hydrogen in solids Recent advancement of renewable energy applications lead to increased focus in materials and surface science on hydrogen technologies. Neutron‐based analytical methods are wellsuited to detect structural sites and dynamics of hydrogen in solids. Because of its large incoherent scattering cross‐section, very small quantities of hydrogen are detectable. This article...

  • R. Foest, M. Schmidt, A. Kruth, D. Richter, S. M. Schmidt
  • Seite 41-47

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