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Proceedings Paper

Recent progress in accurate vibration measurements by laser techniques
Author(s): Hans-Jürgen von Martens; Thomas Bruns; Angelika Täubner; Wolfgang Wabinski; Uwe Göbel
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Paper Abstract

In order to create the scientific foundation of measurement, the national metrology institutes (NMIs) realize the units in compliance with the definition agreed on the international level and disseminate the units to the users through comparison. The PTB - as the National Metrology Institute of Germany providing scientific and technical services for Germany and other countries - has focused major activities to respond to the needs of manufacturers and users of laser vibrometers and of calibration systems applicable to laser vibrometer calibration and/or based on laser interferometry. Theoretical and experimental investigations and comparisons of different standard measuring devices (national standards of Germany) resulted in extended measurement ranges and increased accuracy. PTB has achieved, among other upgraded capabilities, primary calibration of laser vibrometer standards in the frequency range from 0.4°Hz to 20°kHz with a measurement uncertainty of 0.1°% to 0.2°% (frequency dependent, coverage factor k°=°2). This enabled one of the calibration laboratories in Germany, within the framework of the Deutscher Kalibrierdienst (DKD), to be accredited for the service of primary calibration of laser vibrometers in the frequency range of 0.4 Hz to 20 kHz with a best measurement uncertainty 0.25°% to 0.5°%. Improved methods and techniques of laser interferometry, and results of their experimental investigation will be presented. A survey will be given on proposed specifications of laser vibrometers and a first international standardization project for the calibration of laser vibrometers.

Paper Details

Date Published: 21 June 2006
PDF: 23 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 634501 (21 June 2006); doi: 10.1117/12.693092
Show Author Affiliations
Hans-Jürgen von Martens, Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (Germany)
Thomas Bruns, Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (Germany)
Angelika Täubner, Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (Germany)
Wolfgang Wabinski, Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (Germany)
Uwe Göbel, Physikalisch-Technische Bundesanstalt Braunschweig und Berlin (Germany)


Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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