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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 1.2018 - Scientific News

Photolithography is used in industry to manufacture semiconductor elements. Hereby, the nanostructures of the logic gates of a photomask are imaged optically on the semiconductor wafer. For process control, measuring fields consisting of nanostructures in a periodical arrangement are distributed at different points over the entire photomask. The space and funds available being limited, these...

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PTB has developed a method that can be used to manage the temperature of nanocircuits. The method is based on magnetic tunnel junctions and enables quantitative temperature measurements with a time resolution smaller than a nanosecond. Hereby, the tunnel junction acts as a calibrated thermometer by exploiting the temperature dependence of the tunnel resistance. The principle has been demonstrated...

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In cooperation with industrial partners, PTB has developed a pick-up coil for a novel imaging method called magnetic particle imaging (MPI). This coil has already been successfully implemented and tested at the MPI system in Berlin. The new coil considerably improves the sensitivity of the technique. Quantities of magnetic nanoparticles as small as a few nanograms can now be detected.

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The “new SI”, scheduled for May 2019, is based on fundamental constants which can be directly measured by means of macroscopic quantum effects. Verifying the theoretical fundaments of these effects experimentally with the greatest accuracy is one of the core tasks of metrology. In the case of the quantum Hall effect, this has now been successfully done for the first time for a state in which the...

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Investigations carried out at PTB’s QUEST Institute in a model system consisting of ion chains sliding over each other have provided fundamental findings on friction in nanostructures and biomolecules. In the event of defects in the lattice structure, a transition toward superlubricity has been observed and explained.

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In cooperation with the Institut für Arbeitsschutz
(IFA) of the Deutsche Gesetzliche
Unfallversicherung (DGUV),
the prototype of a portable measuring
system for airborne ultrasound has
been developed at PTB. It will allow the
determination and assessment of potential
workplace risks represented by
widespread ultrasonic machines which
can generate very high sound pressure
levels.

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PTB News 1.2018 - Technology transfer

For the exact processing of silicon wafers, it is necessary to identify the orientation of the crystal within the silicon wafer. An invention by PTB has improved the determination of the crystal orientation in <110>-wafers by additionally detecting incident light on special structures (see figure). These test structures are positioned on the surface and have enabled an automated determination...

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To date, two types of particulate matter or of fluid media (as encountered in exhaust gas measuring techniques) have been mixed by feeding one of the media laterally to the flowing direction of the other medium. These two media only mix homogeneously far way from the feeding point. A mixing module developed at PTB reduces the length of the section required for this process to take place, which can...

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Network analyzers with more than two ports must be calibrated daily for use in electronics, communication engineering and high-frequency technology. This calibration can currently be very time consuming. A new calibration method from PTB mitigates this situation. Here, novel multiport star circuit standards are characterized using a PTB reference calibration (see figure). The network analyzer is...

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PTB News 1.2018 - Miscellaneous

The International System of Units (SI) is being fundamentally revised. The foremost expert committee in the world of metrology, the International Committee for Weights and Measures (Comité international des poids et mesures, CIPM), issued its fundamental recommendation for this development at its recently concluded annual assembly. It is hoped that, at their general conference in November 2018,...

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Awards

 

Roman Schwartz

 On 11 October 2017, PTB's Vice President was elected President of the International Committee of Legal Metrology (CIML) for a term of office of 6 years. He had previously already been CIML Vice President for a long time.

Uwe Arz

 This staff member of Department 2.2, High Frequency and Electromagnetic Fields, has received the Best Oral Presentation Award of the 90th ARFTG...

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Topping-out ceremony for an extension to PTB’s Willy Wien Laboratory: The new building will provide laboratory and office space and will be directly connected to the neighboring electron-storage ring Metrology Light Source (MLS). With a gross floor area of approx. 1400 square meters, it will accommodate office, laboratory and seminar space as well as utility rooms. This extension has been...

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First groundbreaking for a highly specialized research building: the new Walther Meißner building will provide laboratory space as well as measuring and clean rooms to measure temperature with the greatest possible accuracy and for research activities relating to all aspects of superconductor sensors. The new building was designed by architects from Rohdecan in Dresden who came out as the winners...

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Representatives from 16 European institutions operating synchrotron radiation sources and/or free-electron lasers met in Brussels for the LEAPS (League of European Accelerator-based Photon Sources) consortium on 13 November 2017. This concentrated load of scientific excellence is to help take up challenges in the fields of energy, transportation, health, food safety and environmental protection....

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This year again, students are invited to take part in topical projects of PTB under the slogan “Dein genauester Sommer!” (Your most accurate summer) from 1 August until 28 September 2018. You are welcome to submit your application for the voluntary internship taking place within the scope of MetroSommer if you study a STEM subject at a German university between the third semester of a Bachelor’s...

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