Scientific news from division 1

Zahlreiche Untersuchungen aus der Vergangenheit zeigen, dass das Trittschall-Normhammerwerk die Quelleigenschaften eines menschlichen Gehers ungenügend nachbildet. Die entsprechende Messnorm schlägt daher alternative Quellen vor, deren Eigenschaften in der PTB untersucht wurden. Es konnte gezeigt werden, dass die alternativen vibroakustischen Quellen den menschlichen Geher gut annähern.

As part of the Conformity Assessment Body of PTB, its “Mass” Department feels responsible for informing its clients both competently and in good time about the changes within the conformity assessment process and for preparing them for the resulting changes.

Since newborns and infants only react to relatively loud sounds, hereby demonstrating auditory perception, objective audiometric procedures are used when testing their hearing (e.g. measuring the brain waves evoked by acoustic stimuli). The acoustic stimuli are hereby transmitted via insert earphones. The reference hearing threshold levels necessary for this can, however, only be determined as...

The number of measuring systems that can detect more than one component of the vector physical quantities "force" and "torque" is increasing. Consequently, there is an increasing demand for traceability in the field of multi-component measurements. By means of an additional facility for torque generation, it becomes possible to generate – in addition to the realized force in the range from 20 kN...

The dynamic calibration of torque transducers requires the modelling of the measuring device and of the transducer under test. The transducer’s dynamic properties are described by means of model parameters which are to be identified from measurement data. To be able to do so, two transfer functions are calculated. In this paper, the transfer functions and the procedure for the model parameter...

Measuring amplifiers are used for transducer output signal conditioning in many dynamic measurement applications. For a traceable measurement, a calibration of all components of the measuring including the conditioning amplifiers is mandatory. In the following, methods for a dynamic calibration of different types of conditioning amplifiers are presented. Measurement uncertainties and calibration...

For the analysis of rotational damping measurements in the time domain, two different identification procedures were compared. The first procedure that was investigated incorporates a Hilbert transform of the data, which enables an analysis by means of a linear regression calculation. The second approach is a direct nonlinear approximation of a damped sine function to the measurement data. The two...

Due to the Measures and Verification Act  (MessEG dated 25 July 2013 [1]) and the Measures and Verification Ordinance (MessEV dated 11 December 2014 [2]), the handling of nationally regulated measuring instruments which are used in commercial and official dealings has changed fundamentally. This applies both to the area of essential metrological requirements made on these measuring instruments and...

Mit verschiedenen Techniken kann in Biogasaufbereitungsanlagen Biogas in Erdgas umgewandelt werden. Doch wie gut laufen die Prozesse in diesen Anlagen ab? Um dies zu untersuchen, wurde in dem Verbundprojekt MONA eine mobile Messanlage entwickelt, die den Abgasstrom dieser Anlagen autonom messen kann. Mit den Messgeräten der Anlagen lassen sich vor Ort und aus der Ferne der Durchfluss und die...

Das von der PTB neu entwickelte Lidar-System erlaubt die präzise Bestimmung des Windvektors in Höhen von 5 m bis über 200 m. Im Gegensatz zu konventionellen Wind-Lidar-Systemen, welche hierfür nahezu homogene Strömungsfelder voraussetzen, kann das von der PTB entwickelte Wind-Lidar auch in komplexen Geländestrukturen eingesetzt werden. Bei einem ersten Feldeinsatz wurden Vergleichsmessungen...

Taking the corrections into account which were determined by the BIPM for the national prototypes within the scope of the latest comparison measurements against the international prototype of the kilogram, the mass of two ²⁸Si spheres was determined at PTB with a standard uncertainty (k = 1) of 7 µg.

Noise by airborne ultrasound is increasingly polluting our daily environment and can be a risk to our health. There is a growing need for an understanding of the perception and the influence of ultrasound and for establishing consistent regulations. The EARS project has brought researchers of several disciplines together and combined neuroimaging and audiological measurements to create a basis for...

In our environment and at the workplace, technical sources produce low frequency sound, which is normally considered inaudible. Installations for the production of green energy are among those sources, namely wind turbines producing infrasound.

Ultrasound is used in medicine for several therapeutic purposes – besides other applications, ultrasound can be used to selectively and locally heat tissue, for example in order to destroy tumors by overheating them. The two most common methods for determining this increase in temperature are either not traceable and provide a poor temporal and spatial resolution (measurements with magnetic...

Noise is one of the fundamental environmental factors impairing health and well-being. Whereas in the hearing frequency range, the handling of noise is well grounded and regulated, in the infrasound and ultrasound range, not only the understanding of perception is missing but also fundamental requirements for measuring instruments as well as applicable, practice-related measurement instructions.

As part of the Conformity Assessment Body of PTB, its “Mass” Department feels responsible for informing its clients both competently and in good time about the changes within the conformity assessment process and for preparing them for the resulting changes.

The number of measuring systems that can detect more than one component of the vector physical quantities "force" and "torque" is increasing. Consequently, there is an increasing demand for traceability in the field of multi-component measurements. By means of an additional facility for torque generation, it becomes possible to generate – in addition to the realized force in the range from 20 kN...

Measuring amplifiers are used for transducer output signal conditioning in many dynamic measurement applications. For a traceable measurement, a calibration of all components of the measuring including the conditioning amplifiers is mandatory. In the following, methods for a dynamic calibration of different types of conditioning amplifiers are presented. Measurement uncertainties and calibration...

Mit verschiedenen Techniken kann in Biogasaufbereitungsanlagen Biogas in Erdgas umgewandelt werden. Doch wie gut laufen die Prozesse in diesen Anlagen ab? Um dies zu untersuchen, wurde in dem Verbundprojekt MONA eine mobile Messanlage entwickelt, die den Abgasstrom dieser Anlagen autonom messen kann. Mit den Messgeräten der Anlagen lassen sich vor Ort und aus der Ferne der Durchfluss und die...

Das von der PTB neu entwickelte Lidar-System erlaubt die präzise Bestimmung des Windvektors in Höhen von 5 m bis über 200 m. Im Gegensatz zu konventionellen Wind-Lidar-Systemen, welche hierfür nahezu homogene Strömungsfelder voraussetzen, kann das von der PTB entwickelte Wind-Lidar auch in komplexen Geländestrukturen eingesetzt werden. Bei einem ersten Feldeinsatz wurden Vergleichsmessungen...

Zahlreiche Untersuchungen aus der Vergangenheit zeigen, dass das Trittschall-Normhammerwerk die Quelleigenschaften eines menschlichen Gehers ungenügend nachbildet. Die entsprechende Messnorm schlägt daher alternative Quellen vor, deren Eigenschaften in der PTB untersucht wurden. Es konnte gezeigt werden, dass die alternativen vibroakustischen Quellen den menschlichen Geher gut annähern.

Since newborns and infants only react to relatively loud sounds, hereby demonstrating auditory perception, objective audiometric procedures are used when testing their hearing (e.g. measuring the brain waves evoked by acoustic stimuli). The acoustic stimuli are hereby transmitted via insert earphones. The reference hearing threshold levels necessary for this can, however, only be determined as...

Due to the Measures and Verification Act  (MessEG dated 25 July 2013 [1]) and the Measures and Verification Ordinance (MessEV dated 11 December 2014 [2]), the handling of nationally regulated measuring instruments which are used in commercial and official dealings has changed fundamentally. This applies both to the area of essential metrological requirements made on these measuring instruments and...

In our environment and at the workplace, technical sources produce low frequency sound, which is normally considered inaudible. Installations for the production of green energy are among those sources, namely wind turbines producing infrasound.

Ultrasound is used in medicine for several therapeutic purposes – besides other applications, ultrasound can be used to selectively and locally heat tissue, for example in order to destroy tumors by overheating them. The two most common methods for determining this increase in temperature are either not traceable and provide a poor temporal and spatial resolution (measurements with magnetic...

Noise is one of the fundamental environmental factors impairing health and well-being. Whereas in the hearing frequency range, the handling of noise is well grounded and regulated, in the infrasound and ultrasound range, not only the understanding of perception is missing but also fundamental requirements for measuring instruments as well as applicable, practice-related measurement instructions.

Die derzeitigen Eichfristen für Wasserzähler betragen 6 Jahre für Kalt- und 5 Jahre für Warmwasserzähler. Eine Verlängerung dieser Fristen ist unter festgelegten Bedingungen mittels spezieller Stichprobenverfahren möglich. Dennoch ist der wirtschaftliche Gesamtaufwand für die notwendigen Zählerwechsel, der den Endverbraucher zusätzlich zu den Kosten für den Wasserverbrauch selbst finanziell...

Wenn Fußböden in Gebäuden von Personen begangen werden, entsteht Lärm. Die Hersteller von Bodenbelägen sind daran interessiert, ihre Produkte mit einem Wert zu kennzeichnen, der besagt, wie laut eine Decke ist, die mit deren Bodenbelag versehen ist.