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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.

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 1.2019 - Scientific News

On the occasion of their 26th General Conference on Weights and Measures (CGPM) in November 2018 in Versailles, the signatory states of the Metre Convention decided to fundamentally reform the International System of Units (SI). This resolution stipulates that, in the future, all SI units will be based on the numerical values laid down for seven selected natural constants. In passing this...

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Within the scope of a cooperation project involving PTB and the Gigahertz- Optik company, a new compact array spectroradiometer was developed, characterized and field-tested. This new device can measure the direct spectral irradiance of the Sun on Earth with very little effort and at short intervals, thus allowing conclusions to be drawn as to the total ozone column of the Earth's atmosphere.

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The increasing complexity of nanostructured surfaces used in technological applications makes their metrological characterization challenging. The importance of highly complex nanostructures consisting of several materials is particularly noticeable in the semiconductor industry. At PTB's laboratory at the BESSY II electron storage ring, it has now been demonstrated on a Si3N4 nanostructure on a...

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Mercury is toxic for many organisms. In the environment, mercury occurs everywhere and in various chemical forms. These mercury compounds are then absorbed by organisms via food, water and air. To assess the risks exhaustively, all forms of mercury as well as their possible conversion products must be known and determined. A traceable analytical method has therefore been developed to enable the...

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In the laser materials processing of workpieces unwanted X-rays can occur. Their dose rate and spectral distribution have now been accurately determined for the first time.

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Magnetic resonance imaging (MRI) is an important imaging procedure in cardiology. To date, only qualitative imaging has been possible with MRI, since the measuring time is limited due to heart movements and breathing. A new image reconstruction procedure has now been developed at PTB. This method quantifies the biophysical parameters of the cardiac muscle with high spatial resolution and thus...

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PTB News 1.2019 - Technology transfer

Today, atomic force microscopy (AFM) is faced with the challenge of measuring 3D structures reliably. State-of-theart 3D measurements have been prone to errors since commercially available cantilevers (i.e. the measuring pins used in an AFM) do not react equally when exposed to forces from three spatial dimensions. At PTB, this problem has been successfully addressed by developing new cantilevers....

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Modern low-temperature systems increasingly make use of “dry” cryostats whose cooling effect is reached in vacuum solely by direct thermal contact. However, cables and electric wiring may impede the cooling process if they are not coupled thermally at suitable locations between room temperature and operating temperature. At PTB, two new designs have therefore been developed to thermally couple...

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Accurate measurements of high voltages in the range of 200 kV require the use of voltage dividers. These devices divide high voltages into smaller ones that can only then be accurately measured. The size of the signal is determined by the scale factor. Up to now, this factor had to be determined by regularly calibrating the voltage dividers against national standards. At PTB, a self-traceable...

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PTB-News 1.2019 - Verschiedenes

Awards

Frank Härtig

Dr. Härtig, the head of Division 1 “Mechanics and Acoustics” has been appointed President Elect of IMEKO following a unanimous vote in his favor. In the coming three years, he will coordinate 24 technical committees. In 2021, he will then take over the presidency of IMEKO for three years.

Gisa Foyer , Holger Kahmann

Mr. Kahmann, who works in Department 1.2 “Solid Mechanics” and...

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What can we expect from the revision of the International System of Units (SI), which was approved on 16 November 2018 and will enter into force on 20 May 2019? The answer depends on who you ask – an ordinary citizen, a student, a scientist or a metrologist in industry. The editorial staff of maßstäbe has asked this question – and gathered the answers in a new issue that is just as colorful and...

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“QuantumFrontiers” is a joint project of Leibniz University Hannover and TU Braunschweig that is realized in close collaboration with PTB. This project will become an excellence cluster and will thus receive several million euros of support within the scope of the excellence strategy of the Federal Republic of Germany and of the German federal states. This excellence strategy aims to promote...

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Dr. Gavin O’Connor was jointly appointed as a university professor by TU Braunschweig and the Physikalisch-Technische Bundesanstalt (PTB). He assumed this post on 1 September 2018. Dr. O'Connor is a 45-yearold chemist who specializes in mass spectrometry, especially in the field of biological measurements and chemical metrology. Prior to his appointment as a professor, Dr. O'Connor worked for the...

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