The methods for the calibration of vibration pick-ups by laser interferometry: part V. Uncertainty evaluation on the ratio of transducer's peak output value to peak input acceleration in shock calibration

Abstract

This study describes the uncertainty of measurement about accelerometer sensitivity in shock calibration based on ISO 16063-13. The typical shock approximates to a sine-squared waveform with peak acceleration in the range from 200 to 5000 m s−2 and a pulse width of several milliseconds. The shocks are generated by a transient collision motion on contact with a rubber surface between two rigid bodies. A laser interferometer with a He–Ne laser measures the displacement change that is input to the accelerometer to be calibrated. The accelerometer sensitivity is evaluated in the time domain and defined by the ratio of the accelerometer's output peak value to the input acceleration peak value. The individual uncertainty components are assessed to formulate an uncertainty budget that includes an expanded uncertainty with a coverage factor of k = 2 at approximately 6.5 × 10−3.

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