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Freifeld mit Hochspannungsgenerator und Präzisionsspannungsteiler

 

Zur Unterstützung des Ausbaus neuartiger DC-Hochspannungsübertragungsnetze, z.B. für die geplanten Nord-Süd-DC-Hochspannungstrassen in Deutschland, wirkt die PTB maßgeblich an der Entwicklung von messtechnischen Lösungen mit. In einem ersten Schritt wurden dazu ein 2000 kV-Gleichspannungsgenerator und ein Spannungsmessteiler entwickelt und auf dem Freifeld der PTB im Sommer 2020 erfolgreich...

 

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Traceable, highly accurate calibration of wavefront sensors such as Shack–Hartmann sensors is a challenging task and an active field of research. We have developed a measurement system for the traceable calibration of wavefront sensors employing spherical wavefronts and a point light source in combination with a three-axis linear stage. We obtain an absolute calibration of sensor errors, including...

 

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The metrological support of the German and European industries in the development of EUV lithography for semiconductor manufacturing is a major activity of PTB at its Berlin-Adlershof site. The close cooperation with ZEISS since 1998 forms a significant basis for the continuous development of PTB's metrological capabilities in the extreme ultraviolet spectral range (EUV). Based on the use of...

 

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Wir berichten über die Charakterisierung der winkelabhängigen Abstrahlung von Einzelphotonenemittern basierend auf einzelnen Stickstofffehlstellen-Zentren (NV-Zentren) in Nanodiamanten bei Raumtemperatur. Ein theoretisches Modell zur Berechnung der winkelabhängigen Abstrahlung eines solchen NV-Zentrums nahe einer dielektrischen Grenzfläche wird präsentiert. Zum ersten Mal wurde die Orientierung...

 

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This paper reports on measurements of the transition frequency of a strontium-87 lattice clock with a record uncertainty of 1.5×10⁻¹⁶, by using two local caesium fountain clocks. This result is an important contribution to the decision processes concerning a redefinition of the SI base unit second based on optical clocks. With data spanning three years of observation, the authors set more...

 

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To ensure the traceability of high-pressure natural gas measurements, PTB has been collaborating with pigsar, which has been PTB's long-standing partner and part of the test-rig infrastructure of the OpenGrid Europe (OGE) gas transmission company for more than 25 years. At the beginning of 2021, pigsar will commission a new facility for gas meter calibration with high-pressure natural gas – the Cl...

 

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Line arrangement of the twisted pair cable

 

As part of an industrial cooperation, PTB recently set up a complete measurement uncertainty budget for symmetrically transmitted scattering parameters, the so-called mixed-mode scattering parameters, for the first time. This parameter is particularly relevant for differential line systems, such as those used for printed circuit boards or multi-wire transmission lines.

 

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Perovskite solar cells (CsPbI3-xBrx) with a low bandgap are an important ingredient in the development of highly efficient tandem solar cells, which layer a perovskite solar cell on top of a silicon solar cell to combine the light harvesting capabilities of both and reach high overall efficiency. The efficiency is vastly influenced by the crystal structure - phase composition and crystal...

 

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Quantum Hall resistance standard in sample socket

 

The Physikalisch-Technische Bundesanstalt (PTB) and the Bureau International des Poids et Mesures (BIPM, based near Paris) have agreed on a scientific cooperation in the field of metrology of the quantum Hall effect. As part of this cooperation, the PTB is supplying quantum standards to the BIPM for the realization of the unit of electrical resistance, the ohm.

 

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The growing number of infrasound sources (infrasound: frequencies below 20 Hz) in our environment is calling society's attention to infrasound exposure. Together with the Department of Experimental Audiology at the Otto von Guericke University Magdeburg, PTB has participated in the project titled "Infrasound and its relevance for audible sound". The project is funded by the Deutsche...

 

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Im Rahmen einer Promotionsarbeit soll die Zündquellensicherheit von Messgeräten, die hochfrequente Strahlung aussenden, in Hinblick auf den Explosionsschutz (Vermeidung einer Zündung von explosionsfähigen Gemischen durch HF-Strahlung) und des Absorptionsverhalten von Stoffen der Prozessindustrie im Frequenzbereich oberhalb 60 GHz untersucht werden. Dieses bezieht sich sowohl auf das Messgerät (als...

 

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Planar plasmonic lenses have attracted a great deal of interest over the last few years for their super-resolution focusing capabilites. These highly compact structures with dimensions of only a few micrometres allow for the focusing of light to sub-wavelength-sized spots with focal lengths reaching into the far-field. This offers opportunities for new methods in nanometrology; for example,...

 

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Photonic integrated circuits (PICs) are revolutionizing nanotechnology, with far-reaching applications in telecommunications, molecular sensing, and quantum information. PIC designs rely on mature nanofabrication processes and readily available and optimised photonic components (gratings, splitters, couplers). Hybrid plasmonic elements can enhance PIC functionality (e.g., wavelength-scale...

 

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New coaxial connector type 1.35 mm

 

As first national metrology institute worldwide PTB has set up traceable scattering parameter measurements with the new coaxial connector of type 1.35 mm. The connector covers frequencies up to 90 GHz and will be included in the next issues of the relevant IEEE and IEC standards. This is the result of a cooperation to develop a connector for E-band applications, in which PTB has been involved...

 

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In der PTB wurde eine neue Methode zur Bestimmung der Aktivität von Actinium-225 entwickelt. Die Methode basiert auf Flüssigszintillationszählern und die spezifische Aktivität einer entsprechenden Lösung wurde mit einer relativen Unsicherheit von nur 0,16 % bestimmt. Darüber hinaus wurden die Halbwertszeiten von Actinium-225 und Polonium-213 sehr genau gemessen.

 

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