Im Rahmen des BMBF-Projektes SiM4diM entwickelt die PTB zusammen mit den Firmen JCMwave und Carl Zeiss IMT sowie der Hochschule Aalen neue Verfahren zur vollständigen Modellierung mikroskopisch-bildgebender Messsysteme auf der Grundlage rigoroser Beugungsrechnungen. Ziel ist es, mit diesem „virtuellen Mikroskop“ die bildbasierte industrielle Messtechnik signifikant zu verbessern und die...

In order to achieve the smallest possible measurement uncertainty in the traceability of gear measurement quantities, the gears on coordinate measuring machines were previously calibrated in single-point probing mode. In recent years, numerous test measurements have been carried out in scanning mode on gears of different dimensions and gear parameters. An optimized measurement strategy has made it...

Das zweijährige Treffen des Subkomittees „DC and Quantum Metrology“ im technischen Komitee „Electricity and Magnetism“ von EURAMET (TC-EM) wurde am 2. und 3. Juni dieses Jahres erstmals als Online-Veranstaltung durchgeführt. Mit mehr als 90 teilnehmenden Experten aus nationalen Metrologieinstituten Europas, Amerikas, Asiens, sowie aus Australien und Neuseeland war die Beteiligung diesmal besonders...

A key component of calibration facilities for traceability tasks is a secondary calibration method, which provides a way to transfer the calibration results obtained in a well-equipped standard laboratory to practical devices in the field. At PTB a sound tube apparatus has been developed, which enables this transfer for measurement devices for airborne infrasound.

This contribution presents experimental and simulation results of a tiltable line scanning low coherence interferometer applied for form measurement of spherical and aspherical objects with a diameter of up to 300 mm.
The region of interest is sampled by multiple annular subapertures that are realigned employing stitching algorithms based on Cartesian- and Zernike polynomial fittings.
The paper...

The construction of a novel setup for hydrophone calibration was finalized by conducting extensive comparisons with further test sites at PTB. After publishing the results of these comparisons and conducting an internal audit, hydrophone calibration services up to 100 MHz can now be offered. Additionally, the results of primary calibrations are available to customers for the first time.

Nach Novellierung des Strahlenschutzrechts ist es soweit: Der Startschuss für die amtliche Dosimetrie der Augenlinse ist geglückt. Die ersten Baumusterprüfungen von Augenlinsendosimetern konnten in der PTB erfolgreich abgeschlossen werden.

Uncertainty quantification by ensemble learning is explored in terms of an application known from the field of computational optical form measurements. The application requires solving a large-scale, nonlinear inverse problem. Ensemble learning is used to extend the scope of a recently developed deep learning approach for this problem in order to provide an uncertainty quantification of the...

The EMPIR Project “Single and entangled photon sources for quantum metrology (SEQUME)” is set to start on June 1st, 2021, for a three-year funding period. The aim of SEQUME project is to develop bright entangled photon sources based on different application-oriented platforms and to exploit high-purity single-photon sources to demonstrate the quantum advantage achieved by using these sources for...

The EMPIR Project “Quantum sensors for metrology based on single-atom-like device technology (QADeT)” is set to start on June 1st 2021 for a three-year funding period. The aim of the QADeT project is to realize single-atom-like systems (SALSs) in suitable materials, e.g. diamond, capable to perform nanoscale, high-sensitivity (electro-magnetic (EM) fields, temperature, stress, etc.) measurements. ...

Das 318. PTB-Seminar „Aktuelle Fortschritte von Kalibrierverfahren im Nieder- und Hochfrequenzbereich“ fand diesjährig am 5. Mai coronabedingt als Online-Seminar statt. Mit insgesamt 130 Teilnehmern, 90 davon PTB-extern aus den Bereichen akkreditierter Kalibrierlaboratorien und industrieller Messgerätehersteller, stieß die Veranstaltung wie bereits in den vergangenen Jahren erneut auf große...

The aim of this project is to enable the SI-traceable measurement of column-integrated aerosol optical properties retrieved from the passive remote sensing of the atmosphere using solar and lunar radiation measurements.

High-energy density batteries play a crucial role for renewables, both as stationary storage system as well as for electric automotive applications. Every battery suffers under degradation effects leading to capacity and lifetime reduction. The understanding of the aging mechanism is mandatory for further cell improvement ...

In quantum communication systems, the precise estimation of the detector´s response to the incoming light is necessary to avoid security breaches. The typical working regime uses a free-running single-photon avalanche diode in combination with attenuated laser pulses at telecom wavelength for encoding information. We demonstrate the validity of an analytical model for this regime which considers...

Research results in the area of traceable 3D AFM metrology and its applications recently received best paper awards by the two scientific journals “Measurement Science and Technology” (MST) and “Surface Topography: Metrology and Properties” (STMP).

In scientific publishing, the publication form Open Access, which ensures immediate, free and permanent availability of scientific publications on the Internet, is becoming increasingly important.

Anni Röse from PTB was featured as DPG Physicist of the week in April, 2021. She studied physics in Göttingen, Germany and received her M.S. degree from the Georg-August University in 2018. Since 2019 she has been pursuing a Ph.D. degree in mechanical engineering at the Ilmenau University of Technology and is a part of the working group 5.42 “Multiwavelength interferometry for geodetic lengths” at...

On 16 November 2018, the 26th General Conference on Weights and Measures (CGPM) approved a revision of the International System of Units (SI). Since the new SI was introduced on 20 May 2019, all SI units have been based on the fixed numerical values of seven constants of nature. In this new system of units, the kilogram is derived from a fixed numerical value of Planck’s constant.

Josephson Arbitrary Waveform Synthesizer (JAWS) können als „quantengenaue“ Generatoren (Source) und Messsysteme (Measurement Unit) für elektrische Gleich- und Wechselspannungssignale eingesetzt werden. JAWS-SMUs sind konventionellen Systemen bezüglich Messunsicherheit und -geschwindigkeit deutlich überlegen und in einem breiten Anwendungsspektrum einsetzbar, so zum Beispiel für Messungen und...