Seismic noise is one of the major sources of noise for Laser Interferometer Gravitational-wave Observatory (LIGO). Isolating the system (e.g. interferometer mirrors) from ground motion reduces the seismic noise. Different sensors such as inertial sensors are used to monitor these disturbances and take part in a feedback or feedforward control system. The tilt-horizontal coupling in inertial sensors is one of the major problems for seismic isolation in low frequencies. The signal of inertial sensors is dominated by tilt motion at low frequencies and our goal is to decouple the translational and tilt information. There are two broad categories of a solution:
Use inertial rotation sensors and subtract the tilt component from the signal of horizontal inertial sensors. But this solution is restricted by the noise level of rotational sensors.
Mechanically filter the tilt transmission to the sensor by suspending an inertial sensor.
This wiki contains relevant information that we wish to regularly access related to our work on a solution for the second approach.