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PTB News

Three times a year, PTB News provides topical information from the varied spectrum of activities of the Physikalisch-Technische Bundesanstalt (PTB) consisting of fundamental research, legal metrology and PTB's various activities in the service of the economy.

PTB News 2.2017 - Scientific News

PTB has succeeded in measuring the Boltzmann constant k independently. A fundamental condition laid down by the Consultative Committee for Thermometry (CCT) has thereby been met, so that all obstacles to the redefinition of the kelvin have been removed by fixing the value of the Boltzmann constant. The final measurements of k with a dielectric-constant gas thermometer were conducted with a...

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In the case of blood samples with pathologically modified blood cells, the hemolysis and staining methods used in routine diagnostics can lead to the wrong identification of certain cell populations or to an inaccurate determination of their concentration. In contrast to this, an AC impedance procedure, which was developed at PTB, allows whole blood samples to be analyzed without disturbing...

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Since the beginning of this year, the DFG has been promoting the establishment and operation of the Core Facility “Metrology of Ultra-Low Magnetic Fields” at PTB. In this way, PTB grants external scientists from universities, international metrology institutes and companies access to its know-how and its equipment for the measurement of extremely small magnetic fields which is unique worldwide.

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For many years, PTB has been leading in the development of current sensors on the basis of SQUIDs (Superconducting QUantum Interference Devices). Now, PTB's SQUID current sensors are used successfully as essential components of superconducting microcalorimeters to characterize novel single-photon emitters and microlasers for quantum optics.

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PTB has topped its own world record established a year ago where electric currents were generated with singleelectron pumps and their quantization was verified with the greatest accuracy by means of a special measuring amplifier. The new record (which was made possible by improving the experimental setup) is a relative measurement uncertainty of only 0.16 μA/A. Moreover, this result was achieved...

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Within the scope of a BMBF project, high-speed measurements with piezoresistive microprobes were investigated. Hereby, scanning speeds of up to 15 mm/s were successfully tested. An essential aspect of the investigations was the wear of the tip.

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PTB News 2.2017 - Technology transfer

To measure medium-sized forces (of approx. 10 kN) up to very high forces (higher than 10 MN), several calibrated force transducers can be connected to obtain a build-up measuring system. Due to increasing requirements, especially in the field of very large force transducers up to 50 MN, reducing the measurement uncertainty of these systems is gaining more and more importance. Due to its special...

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At PTB, a manufacturing procedure for monolayer graphene has been developed to produce a quantum standard for the electric unit of resistance. Thanks to its reliability and simplicity, this enhanced multi-step sublimation method allows the production of large-scale graphene structures. This also paves the way for the mass production of qualitatively highend monolayer graphene films. The produced...

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Ultrasound is used as a therapeutic modality in medicine for various applications including the removal of kidney stones or tumors. A new procedure developed by PTB now allows a traceable spatial calibration of, e.g., high-intensity therapeutic ultrasonic equipment. Based on thermochromic foils which change color in the event of heating induced by ultrasound, it is possible to determine...

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PTB News 2.2017 - Miscellaneous

Awards

Jan Wernecke was awarded the 2016 Ernst Eckhard Koch Prize of the Freundeskreis Helmholtz-Zentrum Berlin at the Technische Universität Berlin for his doctoral thesis entitled “When size does matter: Dimensional metrology of nanostructured layers and surfaces using Xrays”. This paper was developed in the X-ray Radiometry Working Group at the BESSY II electron storage ring in Berlin.

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Within the scope of the Collaborative Research Centre “Designed Quantum States of Matter” (DQ-Mat), with approx. 10 million euros of funding provided by the DFG, researchers from Leibniz University Hannover, from the Center of Applied Space Technology and Microgravity (ZARM) in Bremen and from PTB in Braunschweig have been collaborating to exploit special quantum-mechanical properties of...

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PTB's Department 8.5, “Metrological Information Technology”, has been accepted as a member of the faculty of the Helmholtz Research School on Security Technologies (HRSST). This is a joint program of the Technische Universität Berlin and the German Aerospace Center (DLR) which was initiated in 2010 and supports, among others, excellent doctoral candidates who deal with research on a secure and...

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euspen

Die European Society for Precision Engineering and Nanotechnology (euspen) veranstaltet einmal im Jahr an wechselnden Orten in Europa eine internationale Fachkonferenz mit Industrieausstellung, die als Forum für den Austausch über Innovationen, Forschung und Entwicklungen im Bereich der Präzisionsmess- und Fertigungstechnik dient. In diesem Jahr findet die Konferenz vom 29.5 bis 2.6 in...

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The International System of Units (SI) is being fundamentally reformed. In the fall of 2018, a large international conference is going to set the historical course for the future of the SI. The new SI will be based on fundamental constants instead of the seven base units as previously. PTB has accompanied this process by means of various large-scale research projects – among others the Avogadro...

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