News from the Annual Report 2003 (in German only)
• Fundamentals of metrology
	Mass determination for 1 kg silicon spheres with smallest possible uncertainty
	Testing of the world's largest torque calibration machine (1.1 MN m TCM) (1,1-MN·m-Dm-NME)
	Extension of the force scale from 1 mN to 5 N
	Progress in the Ion Accumulation Experiment
	New miniature bullets for velocities above 1 km/s
	Use of heterodyne modulation techniques in Doppler global velocimetry: new possibilities of investigating non-stationary flow fields
	Pipette test facility in new rooms
	The Hydrodynamic Test Field – quality assurance by supervision of the instrumentation and control for the measuring processes
	Primary procedures for free-field reciprocity calibration of microphones in the ultrasonic region
	Interference-optical ultrasound measurement in two spatial dimensions – another step towards the ultrasound measuring camera
	Membrane hydrophone with adaptable lateral resolution for the characterization of ultrasonic fields
	Light refraction on two superposed ultrasonic fields with the frequency ratio 1:2
	Participation in an intercomparison to determine the measurement uncertainty in noise measurements on fittings
	Uncertainties in the determination of the emitted sound pressure level
• Metrology for economy
	Voltage transducer for the monitoring of structures
	Multicomponent reference measuring facility
	Calibrations with peak shock acceleration values of 100 km/s²
	Impact forces traceably measured with laser Doppler interferometers
	New aspects of the qualification of anechoic rooms
• Metrology for society
	Chinese type approval of weighing instruments of German make"
	Parallel operation of traffic radars in bridge operation
	Sonic nozzles in high-pressure natural gas
	Dependence of the reference hearing threshold for brain stem audiometers on the repetition rate of clicks
	Improved sound field measurement on sonography devices
	Hearing damage due to cuddle toys? Toys as "sound sources close to the ear"
	Causes of deviating measurement results from standard sound reduction test facilities
	Project for the investigation of damping mechanisms in building acoustics
• International affairs
	CCM key comparison CCM.M-K1 (mass: 1 kg) and CCM.M-K2 (mass: 100 mg to 10 kg)
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© Physikalisch-Technische Bundesanstalt Page created: 2004-01-01, last update: 2005-01-02, Dirk Röske