Are IPIs affected by vibration?

Vibration adds noise to the output of any accelerometer-based sensor. The noise degrades the precision of the data, but the mean value of the data can still be used to show trends. Filtering and averaging could possibly improve the data.

Strong vibrations can cause sensors to shift within the casing. The movement may be small, but the result is a change in tilt. The direction and magnitude of the shifts are random, so the resulting data values look erratic. One possible way to prevent shifting of the chain is to fill the casing with sand or soft grout.