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.

Design and Optimization of a Triangular Shear Piezoelectric Acceleration Sensor for Microseismic Monitoring

“…To test the performance of the designed sensor, a sensor experimental test device is built. According to international standards, when calibrating the piezoelectric acceleration sensor, it is necessary to adopt the vibration exciter to provide controllable excitation and record the output signal [36]. The setting of the piezoelectric acceleration sensor calibration experimental test device is shown in Figure 15.…”

A study of Savitzky-Golay filters for derivatives in primary shock calibration

“…The displacement waveform is calculated by computer simulation from the original acceleration waveform. The typical quadrature signals of the p and s waves are generated in accordance with this displacement waveform [7], including the effects of white noise and 16-bit quantization. Figure 4 presents a typical waveform of acceleration, displacement, and interferometric quadrature signals obtained for a low-shock with peak acceleration of 5000 m/s 2 and duration of 0.5 ms.…”

Investigating the transverse motion of a pneumatic shock exciter using two different anvil mounting configurations

“…A prominent component in the estimation of the standard uncertainty (UoM) in accelerometer calibrations is the effect of transverse motion (TM) [13]- [16]. As we are dealing with mechanical systems, this component of the UoM cannot be reduced to zero.…”