Logo PTB
Gateway for politics

Politics

Here you will find the news as well as a short guide to PTB

News

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 einen solche Korrektur der Messung unnötig machen und das Messunsicherheitsbudget verringern.

[ more ]

This revolution has been a long time in the making. Behind it are metrologists working in their scientific laboratories, and scientific managers in their decision-making committees. Now the moment is approaching when many of the old quantities (specifically, the definitions behind them) will have to step down to make way for their successors, who are waiting in the wings. The quantities concerned are the kilogram, the mole, the ampere and the kelvin. 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 unequivocal recommendation for this development at its recently concluded annual assembly. It is hoped that, at their general conference next year, 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...

[ more ]

Opens internal link in current windowMore news   

A brief introduction to PTB

Entrance of PTB Braunschweig

Here in a nutshell are a few Opens internal link in current windowFacts about PTB, or read the current facts and figures from the Opens internal link in current windowAnnual Report. If you want more details, here you will find a Opens internal link in current windowDescription of Tasks of PTB. Furthermore, we recommend our general Info Sheet about PTB which you can download in the right-hand column as a pdf file.

Important research topics

The SI with its 7 base units
In the new International System of Units (SI), seven fundamental constants are determined as defining reference values. (Diagram: PTB)

We present you with an overview of PTB's diverse research landscape as well as some especially highlighted topics in the chapter l Opens internal link in current windowResearch & Development, including the key strategic points in European metrology research (Opens internal link in current windowChallenges and Prospects) as well as the various success stories surrounding Opens internal link in current windowPTB's Technology Transfer. How firmly PTB is integrated in the international research landscape you can see briefly, on the one hand, in the Opens internal link in current windowOverview and, on the other hand, we individually present the respective research institutes of the worldwide metrology landscape in the chapter Opens internal link in current windowInternational Affairs.

Evaluations

Evaluation report (in Geman only)
Stand: Januar 2012

In 2002, PTB as a whole was evaluated – with an excellent outcome. In 2008, an evaluation of PTB research followed, carried out by the Wissenschaftsrat (German Council of Science and Humanities) with a subsequent Implementation Report in 2012. You will find more about this at Opens internal link in current windowPTB in the World of Research or in the pdfs of the evaluation reports which you can download in the right-hand column.

The next evaluation will follow in 2016.