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Autor*in

  • Beck, Uwe (312)
  • Reiners, Georg (35)
  • Hertwig, Andreas (29)
  • Weise, Matthias (29)
  • Sahre, Mario (28)
  • Hielscher, Stefan (20)
  • Lange, Thorid (19)
  • Lerche, D. (15)
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Erscheinungsjahr

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Dokumenttyp

  • Vortrag (123)
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Schlagworte

  • Haftfestigkeit (20)
  • Klebfestigkeit (15)
  • Ellipsometry (13)
  • Zentrifugentechnologie (12)
  • Oberflächentechnik (10)
  • Bonding strength (9)
  • Verbundfestigkeit (9)
  • Adhesive strength (8)
  • Ellipsometrie (8)
  • Oberflächenanalytik (6)
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Organisationseinheit der BAM

  • 6 Materialchemie (96)
  • 6.7 Oberflächenmodifizierung und -messtechnik (94)
  • 8 Zerstörungsfreie Prüfung (16)
  • 8.1 Sensorik, mess- und prüftechnische Verfahren (13)
  • 8.6 Faseroptische Sensorik (13)
  • 6.1 Oberflächenanalytik und Grenzflächenchemie (5)
  • 6.2 Grenzflächenprozesse und Korrosion (5)
  • 8.4 Akustische und elektromagnetische Verfahren (4)
  • 1 Analytische Chemie; Referenzmaterialien (2)
  • 1.5 Proteinanalytik (1)
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Comparative Study on Bonding and Adhesive Strength Testing vs. Centrifuge Test (2010)
Beck, Uwe
Imaging und Mapping von Oberflächen und Schichten in der Materialforschung und -prüfung (2010)
Beck, Uwe
Ellipsometrische Codierung & Fabry-Perot Schichtsysteme mit offenen, versteckten und forensischen Merkmalen zur Produkt-Authentifizierung (2011)
Hönig, D. ; Schneider, S. ; Domnick, R. ; Belzner, M. ; Beck, Uwe ; Hertwig, Andreas ; Stephanowitz, Ralph ; Weise, Matthias
Ellipsometric detection of gases with the surface plasmon resonance effect on gold top-coated with sensitive layers (2011)
Nooke, Alida ; Beck, Uwe ; Hertwig, Andreas ; Krause, Andreas ; Krüger, Hannes ; Lohse, Volkmar ; Negendank, Detlef ; Steinbach, J.
An ellipsometric gas sensor based on the surface Plasmon resonance (SPR) effect of ~ 43 nm thick gold layers was investigated. To protect the gold layer from contamination and to improve the detection limits, the gold layers were top-coated with 5–6 nm thick layers of organic a-C:H or with inorganic metal oxides TiO2 or ZrO2. The additional layers increased the long-term stability, whereas the metal oxide layers protect better than a-C:H. Furthermore, the additional layers decreased the detection limits by one order of magnitude in case of a-C:H and two orders of magnitude in case of the oxides. It could be shown that the detection limits also depend on the kind of preparation (sol–gel process or physical vapour deposition) of the additional layers.
On the application of gold based SPR sensors for the detection of hazardous gases (2010)
Nooke, Alida ; Beck, Uwe ; Hertwig, Andreas ; Krause, Andreas ; Krüger, Hannes ; Lohse, Volkmar ; Negendank, Detlef ; Steinbach, J.
A gas sensor system based on the surface plasmon resonance (SPR) effect in a 44 nm Au layer was studied. The usability of this sensor system was investigated for several analyte gases and gas mixtures which are interesting due to their flammability, toxicity or greenhouse effect. The SPR effect of gold was measured in nitrogen and compared with the gaseous alkane series which caused a shift of the position of the SPR effect. For in situ measurements, the phase shift Δ at the SPR angle (ψ minimum) in the analyte gas mixtures was measured for investigated gases in comparison with nitrogen. With this method, detection limits of different gases could be determined, which lie in a range interesting for safety engineering. Furthermore the aging effect of the gold layers which leads to loss in sensitivity of the sensor was investigated.
Fabry-Perot Based Laser Systems with Embedded Public, Hidden, and Forensic Information For Anti-counterfeiting Applications (2011)
Beck, Uwe
Verification and Authentication of Surface- and Layer-embedded information for Anti-counterfeiting Applications by Imaging Ellipsometry (2011)
Beck, Uwe
Funktionalisierung von Oberflächen mittels Mikro- und Nanotechnologien (2010)
Beck, Uwe
Quantitative adhesion testing of optical coatings by means of centrifuge technology (2011)
Beck, Uwe ; Reiners, Georg ; Lerche, D. ; Rietz, U. ; Niederwald, H.
Although adhesion testing of coatings is of fundamental interest for quality assurance, it is still a challenge regarding reliable quantitative results. Because of the huge variety of coating/ substrate systems in terms of materials and thickness range, adhesion tests display the same variety as coating/substrate systems. Some tests are qualitative, many are quantitative but except for the pull (DIN EN ISO 15870) and pull-off test (DIN EN ISO 4624) adhesion is not measured in terms of force per area. For optical coatings, the standardized tests according to ISO 9211-4 apply, i.e. abrasion tests (cheese cloth or eraser test) and adhesion tests (tape or cross-hatch test) with different degrees of severity. Instead of the adhesion strength, all these single-sample tests provide only quantitative information on the abrasion or adhesion resistance of a particular coating/ substrate system. The centrifuge test has manifold advantages. First, it can be easily run as multiple-sample test. Second, adhesion strength is measured in absolute numbers (N/mm2). Third, the centrifuge test requires only a one-sided sample support instead of a two-sided sample clamping as the pull- and pull-off test do. Fourth, it is much easier and faster than many other tests. Fifth, the centrifuge technology additionally enables tests under defined climates or harsh environments. Last but not least, versatile test conditions (alternating loads at various load rates) important to fatigue testing can be easily realized by varying the number of revolutions. The centrifuge test was applied to the testing of optical coatings on glass and CaF2. It could be shown that there are significant advantages compared to other tests. In particular, the centrifuge test was able to discriminate the adhesion strength for coating/substrate systems until failure which all passed the standardized tests of ISO 9211-4.
Haftfestigkeitsprüfung mittels Zentrifugenversuch (2011)
Beck, Uwe
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