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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 3.2022 - SCIENTIFIC NEWS

Picture of the blue fluorescent cloud of strontium atoms

In many areas of metrology, quantum sensors with cold, neutral atoms have been shifting the limits of what can actually be measured. The core piece of these setups is a magneto-optical trap for trapping and cooling down atoms by means of lasers. If the results of current research programs are to be utilized and marketed for applications, the setups have to become more compact and more robust. This...

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An example showing how the new device can be used

Due to the increasing number of industrial ultrasound devices, the airborne ultrasound exposure of employees needs to be measured more and more often. The high-frequency personal ultrasound exposimeter developed at PTB is the first device of this kind that can be worn directly by the person to be monitored and can determine the individual ultrasound exposure of this person.

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The sphere is located on a rotating stage and is measured at two opposing points by means of laser light.

Within the scope of the new definition of the kilogram – the SI unit of mass –, a procedure for manufacturing nearly perfectly round silicon spheres was developed at PTB. The form errors of these spheres only range from approx. 10 nm to 100 nm, and the spheres must be polished for several weeks. During this period, their form and roughness must be checked on a daily basis. A novel measuring device...

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carInternational e-voting network

Elections are the basis of a democratic society. In times of crises such as pandemics, war, and other catastrophes, casting a ballot at a polling place may not be possible. Electronic voting (e-voting) presents a solution to this challenge. PTB has developed an approach based on blockchain technology that allows voters to change their vote right up to the election deadline while ensuring that the...

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Graphene quantum Hall resistor developed and
manufactured at PTB and electrically connected
in its sample holder

Quantum Hall resistors made of graphene as primary impedance standards were optimized for AC voltage applications in a European metrology research project. They can now be operated with considerably less effort. This means that a larger number of metrology institutes and – beyond that – industrial calibration laboratories are now able to realize the units of resistance, capacitance and inductance.

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Hydrogen chloride gas (HCl) occurs as an impurity in biogas/biomethane, stack emissions from combustion processes and in the air of clean rooms and is harmful to health. In particular for legally prescribed measurements, SI traceability has been a problem to this day. The first spectroscopic HCl primary standard worldwide has now been developed and metrologically validated at PTB.

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A town called Dorsten and located in the northern part of the Ruhr area is now home to a new high-pressure calibration facility for gas meters. Closed Loop Pigsar is the largest facility of its kind in Germany. It enables testing in a closed circuit and provides enhanced measurement capabilities. This facility is traceable to the national high-pressure cubic meter. The first tests for customers...

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PTB-News 3.2022 - TECHNOLOGY TRANSFER

Laser interferometers are frequently used for high-precision length measurements on objects having structures in the nanometer range. If precision requirements are high, even slight changes of the refractive index of air have a negative impact. A measurement in vacuum would prevent this impact but is not possible for all measurement objects. Together with the Institut für Mikroelektronik- und...

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Ion trap of the “Opticlock” project

In trapped-ion quantum computers, light particles (photons) serve to read out the information stored in the ion qubits. Conventional ion traps are equipped with electrodes for generating the trap potential and with separate components for photon detection. With this novel PTB concept, these two components are being combined into an integrated unit for the first time. (Technology Offer 532)

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CAD representation of the gas-mixing device

The use of gas sensors and their calibration has become increasingly important for the monitoring of facilities and for health protection. For example, CO2 sensors are used for monitoring air quality in order to prevent virus transmission. To calibrate these sensors, test gas mixtures are required where the ratio of the relevant component can be dynamically adjusted, especially in the range from...

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PTB-News 3.2022 - MISCELLANEOUS

Awards

Frank Härtig

Vizepräsident der PTB, Frank Härtig

The vice president of PTB has been a member of the advisory board of the Deutsche Akkreditierungsstelle GmBH (DAkkS), to which representatives of the federal government and federal states belong, since 1 August 20

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The federal state of Lower Saxony is promoting the development of an enduring and effective structure to support the founding of deep tech companies in the field of quantum technologies in a program called “High Tech Incubator”. The program is supported by the Quantum Technology Competence Center of PTB together with partner universities from Hannover (Leibniz University) and Braunschweig...

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The existing optical fiber link for time and frequency transmission between PTB and Leibniz University Hannover is being upgraded to a test link for quantum communication. The project InterSync, which is receiving 1.5 million euros in funding from the German Research Foundation (DFG), is establishing a tap-proof data link between the two facilities which are more than 70 km apart. A team of...

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Up to 15 million euros in federal funding will be invested in Lower Saxony’s quantum technology in the coming three years. Special labs called “QVLS-iLabs-Labore” are to link the field of research to industry. The developers from the TU Braunschweig, Leibniz University Hannover and PTB intend to put a quantum computer into operation by 2025.

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The Braunschweig Integrated Centre of Systems Biology (BRICS) of the TU Braunschweig as well as PTB in Braunschweig have been officially collaborating since 1 June 2022. The objective requirements – units, limiting values and measurement methods – which are valid throughout the world for so-called “biologics” (biopharmaceuticals) are to be researched. This work is useful for cholesterol...

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