MEASUREMENT UNCERTAINTY OF HIGH-SHOCK CALIBRATION SYSTEMS

Martin Brucke, Georg Siegmund, Christian Ehrmann, Uwe Bühn, Michael Mende

Abstract

Applications that require measurements of shock type acceleration in an amplitude range above 100 000 m/s² are becoming increasingly more important in the industry. Thus also an accurate calibration of accelerometers used for such measurements is compulsory. This paper focuses on appropriate reference standards and the influence variables that determine the measurement uncertainty of high shock calibration systems using Hopkinson-bar shock exciters up to amplitudes of 2 000 000 m/s². What are the main variables that determine the measurement uncertainty? How can the uncertainty contributions of different reference sensors (laser vibrometer and strain gauges) be verified?<BR />The paper aims to give an overview and also tries to identify where future research will be necessary to understand influence variables and optimize the measurement uncertainty of such high-shock calibration systems.

Keywords

shock calibration of accelerometers, measurement uncertainty, laser vibrometers, strain gauges

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IMEKO-WC-2012-TC22-O7.pdf

DOI

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IMEKO TC

TC22 - Vibration Measurement

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