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Stephan Weil mit Siliziumkugel

Einen prägnanten Eindruck von der großen thematischen Bandbreite der Physikalisch-Technischen Bundesanstalt (PTB) bekam Ministerpräsident Stephan Weil bei seinem Besuch der PTB am 11. April. Stephan Weil informierte sich sowohl über die Grundlagenforschung bei den Atomuhren als auch über die sehr anwendungsnahen PTB-Aufgaben auf dem Feld der Energiewende bei der Besichtigung des neuen Windenergiezentrums der PTB. Hauptsächlich ging es jedoch um wissenschaftspolitische Themen von beiderseitigem Interesse. „Ich bin überaus beeindruckt von den messtechnischen Leistungen und der wissenschaftspolitischen Weitsicht der PTB. Die Mitarbeiterinnen und Mitarbeiter leisten hier in Braunschweig exzellente Arbeit und tragen maßgeblich dazu bei, dass die PTB auf Landes- und Bundesebene zu den herausragenden Forschungseinrichtungen zählt“, so Stephan Weil beim Gespräch mit dem PTB-Präsidium. 

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The "Young Scientist Award", endowed with 1000 euros, was awarded for the first time within the scope of the 9th High Level Expert Meeting "Asphere Metrology", hosted by the Competence Center Ultrapräzise Oberflächenbearbeitung (CC UPOB e.V.). This award is intended to nurture and honour young scientists working in the fields of ultra-precise surface finishing. The nominated candidates presented the results of their research to the audience of experts in the form of short lectures and a poster. Jan-Henrik Hagemann, a doctoral candidate from PTB's Working Group 4.22, "Flatness Metrology", won first prize for his work on the interferometric measurement of the form of optical surfaces with partly coherent multi-source illumination.

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Aufbau der transportablen optischen Uhr

A European collaboration involving clock experts from the National Physical Laboratory (NPL), the Physikalisch-Technische Bundesanstalt (PTB) and the Istituto Nazionale di Ricerca Metrologica (INRIM) has used PTB's transportable optical atomic clocks to measure gravitation for the first time. The results of the experiment were published in Opens external link in new windowNature Physics.

Listen to a Opens external link in new windowNature Podcast (15 February) on this topic!

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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 of the competition organized by the Federal Institute for Research on Building, Urban Affairs and Spatial Development (BBR). The new Walther Meißner building will give fresh impetus to two research fields, namely the development and manufacturing of SQUIDs based on supraconductor thinfilm technology – a field in which PTB is the world leader – and the application of the best cryostat systems in thermometry, allowing PTB to calibrate thermometers for industry over a very wide temperature range with all related services coming from one provider....

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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 implemented by the Federal Institute for Research on Building, Urban Affairs and Spatial Development (BBR); its constructional completion is planned for 2019.

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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 Conference for his publication “Establishing Traceability for On-Wafer S-Parameter Measurements of Membrane Technology Devices up to 110 GHz”.

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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, the international community of signatories to the Metre Convention will heed the experts’ advice and provide the physical units with an especially firm foundation – one that consists of the set values of selected fundamental constants. The seven base units will thereby lose their prominent role. Instead, seven fundamental constants will be determined as defining reference entities from which all units can be derived.

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Links: Prof. Dr. h. c. mult. Hasso Plattner (Foto: SAP SE/Wolfgang Scheible).  Rechts: Prof. Dr.-Ing. Joachim Milberg (Foto: BMW)

Der Werner-von-Siemens-Ring, der die Lebensleistung bedeutender Ingenieure würdigt, bildet diesmal gleich zwei Zukunftsfelder ab: Mobilität und Digitalisierung. Auf ihren jeweiligen Gebieten gehören die Preisträger zu den ganz Großen ihres Fachs. Joachim Milberg als BMW-Chef und Hasso Plattner als Gründer von SAP haben den Wirtschaftsstandort Deutschland entscheidend geprägt. Und was der Jury mindestens ebenso wichtig war: Beide haben mit einer Fülle von Ideen immer wieder Brücken gebaut – zwischen Wissenschaft und Forschung, Industrie und Politik. 

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Einzelphotonenquellen sind vielversprechende Kandidaten als Standardquelle für die Radiometrie. Ziel ist es, solche Quellen für die effiziente Kalibrierung der Detektionseffizienz von Einzelphotonendetektoren zu nutzen, da ihre Photonenstatistik keinen Einfluss auf das Kalibriersignal hat. Momentan werden hierfür noch stark abgeschwächte Laser verwendet, welche eine gewisse Wahrscheinlichkeit zur Multi-Photon-Emission besitzen und die Messung daher korrigiert werden muss. Die Verwendung einer puren Einzelphotonenquelle würde eine solche Korrektur der Messung unnötig machen und das Messunsicherheitsbudget verringern.

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