Metrology

News Metrology

• Groundbreaking method to map the interaction between atomically thin layers
  

  When two atomically thin layers of a material are stacked and twisted slightly on top of one another, they can develop radically different properties. They may become superconducting or even develop magnetic or electronic properties due to the interaction of their two layers. The challenge for scien more

• Original kilogram replaced
  

  In addition to Ampere, Kelvin, Mol and Co., the kilogram also is now defined by a natural constant. In concrete terms, this means that the original kilogram, which has been the measure of all things for 130 years, has now served its purpose in Paris. This is made possible by the single crystals grow more

• Power to the constants!
  

  If you come across someone who can tell you by heart and without cheating what a kilogram is after 20 May 2019, beware! It is probably a particular kind of scientist, a metrologist, who is still overly enthusiastic about the fundamental change experienced by the International System of Units, the SI more

Videos Metrology

Everything different, Nothing changes

During the last several years, Mettler-Toledo has been privileged to participate in several strategic partnerships that have contributed to the newly established and highly stable kilogram definition. This video explains the background of the 1 kg redefinition and the effect this change will hav ... more

White papers Metrology

• 1 kg Redefinition: Everything different, nothing changes
  

  A new definition of the kilogram was necessary, in order to ensure the measurement unit is independent from a physical object. more

Publications Metrology

• Entropy, Vol. 20, Pages 494: SIP-Based Single Neuron Stochastic Predictive Control for Non-Gaussian Networked Control Systems with Uncertain Metrology Delays

  Entropy, Vol. 20, Pages 494: SIP-Based Single Neuron Stochastic Predictive Control for Non-Gaussian Networked Control Systems with Uncertain Metrology Delays Entropy doi: 10.3390/e20070494 Authors: Xinying Xu Yalan Zhao Mifeng Ren Lan Cheng Mingyue Gong In this paper, a novel more

• Orientation-dependent stereo Wigner time delay and electron localization in a small molecule

  Attosecond metrology of atoms has accessed the time scale of the most fundamental processes in quantum mechanics. Transferring the time-resolved photoelectric effect from atoms to molecules considerably increases experimental and theoretical challenges. Here we show that orientation- and energy-res more

• Sensors, Vol. 18, Pages 1734: Reader Architectures for Wireless Surface Acoustic Wave Sensors

  Sensors, Vol. 18, Pages 1734: Reader Architectures for Wireless Surface Acoustic Wave Sensors Sensors doi: 10.3390/s18061734 Authors: Fabian Lurz Thomas Ostertag Benedict Scheiner Robert Weigel Alexander Koelpin Wireless surface acoustic wave (SAW) sensors have some unique fea more

q&more articles Metrology

• Natural constants take center stage
  

  The 20th of May 2019 is a special day. From that day on, the old definitions of what a kilogram, a mole, an ampere and a kelvin represent, are history. The future of the International System of Units will see natural constants play the star roles. more

• “Game over” for the Paris kilogram
  

  For about 200 years, any mass given in kilograms, grams and micrograms referred to a defined artifact accessible in only a single location on earth. A small metal cylinder had represented one kilogram since the metric system was introduced in France. Its successor became world famous as the “International Prototype of the Kilogram” (IPK). more

• The Best Measurement
  

  It is now more than 30 years since attempts started to find a way of defining the kilogram based on an atomic constant or a fundamental physical constant. Since then, two methods have advanced sufficiently far to make it likely that there will be a new definition within the coming years, namely the Watt balance ­experiment for determination of Planck‘s constant h and the Avogadro experiment for determining the ­Avogadro Constant NA. more

Authors Metrology

• Prof. Dr. Joachim H. Ullrich
  

  Joachim Ullrich, born in 1956, studied geophysics and physics at the University of Frankfurt where, after graduating in 1983, he also completed his doctorate in 1987 and qualified as a professor in 1994. From 1989 to 1997 he worked as a research assistant at the Gesellschaft für Schwerionenforschung more

• Dr. Peter Becker
  

  studied physics at the University of Münster and received his doctorate in 1974 from the Institut für Physik der Universität Dortmund (Dortmund University Institute of Physics). From there he moved to Physikalisch-Technischen Bundesanstalt (National Metrology Institute) in Braunschweig (Brunswick). more

• Dr. Martina Hedrich
  

  Martina Hedrich studied chemistry at Freie Universität Berlin (FUB), where she also received her doctorate in inorganic chemistry in the field of X-ray structure analysis. During her postdoc at the Hahn Meitner Institute in Berlin, she dedicated her work to trace analysis in human tissue samples bef more