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Scientific news from division 1

Scientific news 2019

Fundamentals of Metrology

The sound emission of technical devices, machinery and equipment has to be declared for purposes of environmental protection, occupational health and consumer information. An upper limit for the sound emission is legally binding for some machines used outdoors. The descriptor for sound emission is the sound power level, which is measured by internationally harmonised methods. A disadvantage of...

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Within the scope of the EU joint project titled Ears II (EMPIR project No. 15HLT03), hearing tests were planned at PTB in order to investigate how humans perceive infrasound (frequencies f below 20 Hz) combined with sound in the "conventional" acoustic frequency range (i.e."audible sound" in the frequency range 20 Hz ≤ f ≤ 20 kHz). The first step consisted in developing a sound source system able...

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Metrology for Economy

Due to the redefinition of the kilogram and due to the new possibilities this offers to disseminate the unit kilogram for a practice-oriented and stable traceability chain, the demand of national metrological institutes, calibration laboratories and balance manufacturers for silicon spheres is very high. In this context, the "Si-kg" transfer project, together with the participating companies, has...

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When carrying out fatigue tests, the connected signal conditioning electronics must also be calibrated. One way of doing such a calibration is described in the international standard ISO 4965-2. The first part of the standard deals with the associated test systems. At PTB, a calibration of such a measuring amplifier has now been performed for the first time for a customer. The calibration...

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PTB is developing a measurement procedure to determine airborne ultrasound exposure at the workplace and is hereby pursuing an open-science strategy in order to make the research data and results freely available to the public. In this way, the development and testing of this procedure, which was designed for occupational safety and health, becomes transparent and comprehensible. Furthermore, it...

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Metrology for Society

PTB is developing a measurement procedure to determine airborne ultrasound exposure at the workplace and is hereby pursuing an open-science strategy in order to make the research data and results freely available to the public. In this way, the development and testing of this procedure, which was designed for occupational safety and health, becomes transparent and comprehensible. Furthermore, it...

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International Affairs

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