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Scientific news from division 1

The Rudolf-Martin-Ehrenurkunde is awarded annually by the DIN/VDI Standards Committee Acoustics, Noise Control and Vibration Engineering (NALS) for special achievements in standardisation. It is dedicated to the former Head of the Mechanics and Acoustics Division at PTB and Founding Chair of NALS Prof. Rudolf Martin. This year it returns to PTB in a way when it was awarded to Dr. Thomas Fedtke,...

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The intense discussions on noise disturbance, particularly in the vicinity of wind turbines, raise the public awareness to infrasound (sound with frequencies < 20 Hz). Of major importance, thereby, is the knowledge about infrasound perception under realistic conditions, e.g. with binaural hearing. The monaural and binaural loudness perception of infrasound was investigated in a study with...

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Like everywhere else, time does not stand still for water meters. The requirements change, be it due to technological progress or changes in drinking water consumption. The question is whether measurement accuracy is still given under the changed conditions. Metrological infrastructure and procedures to address this question were discussed at a workshop organized by the EMPIR-project MetroWaMet.

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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.

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