Traceable vibration measurements--who needs them?

Norman H. Clark

doi:10.1117/12.307698

1 June 1998 Traceable vibration measurements--who needs them?

Norman H. Clark

Proceedings Volume 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1998) https://doi.org/10.1117/12.307698
Event: Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1998, Ancona, Italy

Abstract

Laser Doppler Velocimetry (LDV) is rapidly displacing accelerometer methods in many vibration measurement applications. Although the technique may be considered by some to give an 'absolute' measure of vibration amplitude, there are certain instances in which it may be necessary to show a rigorous traceability, to primary physical standards, of measured amplitudes. In particular, where vibration measurements are made in order to show compliance or non- compliance with a clause in a contract, the measurer must be able to state uncertainties at a specified level of confidence. In such cases the calibration component of uncertainty must be known, and traceability must be shown to primary standards of length, time and voltage. In other cases, eg mode studies, only amplitude linearity may be of interest. This paper discusses the various methods currently used in national measurement institutes for primary calibration of vibration-measuring transducers, and the uncertainties in these methods. The usefulness of portable calibrators is discussed, and the practicality of using reference accelerometers to calibrate LDV measuring systems. Finally, the paper discusses the possibility of an alternative path of traceability of vibration measurements, using a LDV reference instrument.

Citation Download Citation

Norman H. Clark "Traceable vibration measurements--who needs them?", Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); https://doi.org/10.1117/12.307698

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