Do you need to do signal processing on an accelerometer?

Do you need to do signal processing on an accelerometer?

The data provided in these reports are typically presented as they were recorded – the only processing has been to convert the data to engineering prototype units and to attach some zero reference to each time history. Some signal processing will generally be necessary, especially for integrating accelerometer records.

Which is the best frequency to double integrate accelerometers?

The relative displacement time histories recorded by the linear potentiometers were compared to those obtained by double-integrating the accelerometers. The best average agreement between the potentiometers and accelerometers was obtained using a corner frequency of about 0.15 Hz.

What should the corner frequency of an accelerometer be?

The best average agreement between the potentiometers and accelerometers was obtained using a corner frequency of about 0.15 Hz. Figures 2 and 3 show comparisons of displacement time histories obtained by integrating acceleration time histories together with those recorded by linear potentiometers.

How does integration of accelerometers give relative displacement?

Integration of the accelerometers gives absolute displacements, and thus the relative displacement could be obtained by subtracting the two integrated time histories. The relative displacement time histories recorded by the linear potentiometers were compared to those obtained by double-integrating the accelerometers.

Why are high pass filters used in an accelerometer?

High-pass filters are generally included in the analog circuits to prevent drift in piezoelectric accelerometer signals. Analog high-pass filters remove low frequency information, but also corrupt the amplitude and phase of the signal near the filter corner frequency.

How are pair of accelerometers used in instrumentation?

Several instrumentation tests were performed where pairs of accelerometers were placed on opposite ends of a linear potentiometer that was measuring the relative displacement between two objects on the centrifuge.

What happens when you integrate accelerometer time histories?

Integrating accelerometer time histories without proper filtering will produce drift in the calculated velocities and displacements. The following information was taken from Wilson 1998 and from Wilson et al. 1998.