Seismic vibration meter - with silicone oil filled cube monitored by three=dimensional light barriers

摘要

A vibration meter uses instead of a seismorgraph a trans-parent cube, filled with a coloured liquid (1), pref very low-viscosity silicone oil, within a vessel with three light emitters (2) and sensors (3), arranged in three planes at right angles to each other. Two water-levels (4) and three adjustments screws (5) are used to level up the cube. Power is supplied through a plug socket (6). ADVANTAGE - This permits the recording of seismic vibration of the soil in three dimensions and is simple to produce.