Im Rahmen eines Forschungsvorhabens mit einem Industriepartner wurden die Entwicklung, die Erprobung und die Anwendung von Messmethoden und Transfernormalen für die präzise Messung der Strahlungsleistung von Diodenlasern im Leistungsbereich bis zu 250 W untersucht. Nach Abschluss dieses Projektes können nun Laserleistungsmessgeräte bei den industrierelevanten Wellenlängen 915 nm, 940 nm und 980 nm...

Die PTB hat zusammen mit elf anderen nationalen Metrologieinstituten an einem Schlüsselvergleich zur Messung der mittleren Gitterkonstanten auf zweidimensionalen Gittern teilgenommen. Die in der PTB mit optischer Diffraktometrie ermittelten Messwerte stimmten mit dem internationalen Referenzwert innerhalb von 0,016 nm überein. Der vollständige Bericht ist unter der folgenden Internet-Adresse...

Thermal sensors developed at PTB can be favourably applied to the measurement of intensity profiles of modern diagnostic ultrasound devices and complement the conventional hydrophone measurement technique.

After the implementation of the new EU Directive 2003/10/EG regarding protection against noise at the work place, a sound insulation screen for orchestra musicians has been developed in a joint project of WG 1.72 "Noise Measuring Technology", the Städtische Bühnen Münster und the Accident Insurance North-Rhine Westphalia. The sound reduction values already determined in laboratory...

To calibrate torque transducers by means of the comparison procedure, so-called reference transducers are needed which furnish traceable torque reference values. These reference transducers, in turn, are calibrated in high-grade facilities in which the reference transducer are subjected to other – normally smaller - cross forces and bending moments than in the comparison procedure. The...

In Zusammenarbeit mit dem Fachbereich 6.3 „Strahlenschutzdosimetrie” wurde eine 120kV-Photonenbestrahlungsanlage konstruiert und gefertigt, die eine definierte Bestrahlung von Messgeräten (Orts- und Personendosimeter) zur Kalibrierung und Bauartzulassung im Rahmen des Strahlenschutzes sowie zur Darstellung von Photonen-Referenzstrahlungsfeldern ermöglicht.

E.Luiken, AG 5.511, E-Mail:...

Die Norm "Bestimmung der Explosionspunkte von Flüssigkeiten" wurde fertiggestellt. Die Aufgabe der Working Group 1 des CEN/Technical Committee 305, Bestimmungsverfahren für sicherheitstechnische Kenngrößen zu erarbeiten, wurde für den Bereich der Gase und Dämpfe damit erfüllt. Insgesamt stehen für diesen Bereich nun sechs europäische Normen zur Verfügung.

Es ist bekannt, dass die Dosis im Tumorvolumen durch Bestrahlung in einem magnetischen Feld signifikant erhöht werden kann, weil dieses die Spurverläufe höherenergetischer Primär- oder Sekundärelektronen beeinflusst. Inwieweit das Anlegen eines externen Magnetfeldes auch die Spurstruktur niederenergetischer Sekundärelektronen, die letztendlich den größten Anteil der Dosis bei einer...

PTB's white-spirit-operated mineral oil test rig is used to test and calibrate quantity and flow meters which are dedicated to the measurement of fluids other than water. Its operation modus (now also with direct pumping and "flying" start/stop operation) as well as its controlling are presently being radically extended. Within the scope of this extension, also one of the volumetric standards of...

Quantity and flow meters are tested and calibrated under reference conditions by means of stationary measurement equipment. This becomes a problem when the measurement conditions in the industrial application differ from these conditions, so that the behaviour of a flow meter changes and the measurement results are, thus, biased. Such problems can be avoided by using a patented method which...

The effort to determine impact sound reduction is high due to the use of a building acoustic test facility consisting of two rooms of about 50 m³ each. A compact measurement method was now developed at PTB where the complete two-room configuration is replaced by a desk-sized setup.

In the field of weighing technology, the first certificate for a special module for weighing instruments has been issued. This module realizes functions which make it possible to convert connected, simple weighing instruments which have no price-computing function into weighing instruments having a price-computing function. By connecting a label printer - in combination with suitable...

After having been in operation for more than ten years, the entire IT hardware and software of the hydrodynamic test field has been replaced by new, state-of-the-art computer hardware and the corresponding system and user software. In this way, the reliability, functionality and operability of the plant could be considerably improved.

For radiation biology and some leading-edge fields of radiation medicine, it is of great importance to understand the relationship between the microscopic structure of the particle track of ionizing radiation and its biological effectiveness. To advance the networking of important research groups within an interdisciplinary network at the European level, PTB organised the 249th PTB seminar...

The International Workshop "Calibration of storage tanks by optical scanning", which took place in Hamburg on June 17 and 18, 2009 and constituted, for the present, the conclusion of a very successful cooperation between PTB, the Verification Authority North and the Trimble Holdings GmbH (formerly CALLIDUS precision systems GmbH) in the development of a novel procedure for the laser-optical...

From March 24 to 26, 2009, the 14th Technical Discussion on the Monitoring of Environmental Radioactivity took place at the Albert Ludwigs University in Freiburg. Under the title "IMIS - Integrating system for environmental monitoring and emergency provisions" the status quo of the monitoring of radioactive substances in the environment, future developments and - partly in workshops especially...

Activity measuring procedures for Cu-64 have been established and used within the scope of a comparison in the International Reference System (SIR). In addition, the half-life and emission probabilities of the isotope could be determined.

Over 130 technical experts in gas volume measurement technology and legal metrology from China and Europe had the opportunity to exchange ideas on 3rd and 4th November 2008 in Beijing about the current developments in the gas sector.

On 24.3.2009 Volker Wittstock was awarded the Lothar Cremer Prize of the Deutsche Gesellschaft für Akustik (German Acoustical Society) on the occasion of the annual conference on acoustics in Rotterdam. The DEGA presents this prize once a year for outstanding work by young scientists.

Dose measurements in radiotherapy are carried out according to the German standard DIN 6800-2 or the international dosimetry protocol IAEA TRS-398 by means of ionisation dosimeters which have been calibrated to indicate the absorbed dose to water in the 60Co radiation field. If such an ionisation dosimeter is used in a radiation field having a different energy (e.g. in a photon field generated by...