Optical interferometer IBIS-FS PLUS

The IBIS-FS Plus configuration is aimed at users who need to perform measurements in places characterized by largeground vibrations where the IBIS-FS is installed. These ground vibrations can be transmitted to the IBIS-FS tripod,aftecting the measurement results.For this purpose IBIS-FS Plus integrates an accelerometer on the radar head whose data is used for cancelling the self-induced vibrations transmitted to the radar from the ground. The blue line shows the frequency responsemeasured by IBIS-FS. The vibration of the radar headinduced from ground vibration) is measured by theintegrated accelerometer (red line) and subtracted, resultingin the green line which contains only the measurementtarget's frequencies.Shows the effect of the above subtraction procedureon the resulting displacemernt of the target. Spuriousdisplacements induced by soil vibrations are cancelled.