Abstract:
I tested the performance of sensor correction of LVDTs.

Detail:
I tested sensor correction of IP LVDT by using ITMX.

First, I measured spectra of seismometer signals and LVDT signals to check their cross-calibration (fig1).
Coherence is high between 0.1 Hz to 0.6 Hz, so we can correct the LVDT signals with seismometer.
Also, tatio between LVDT signals and seismometer signals at correction band is almost 1, so cross-calibration seems fine.
After that, I set filters for sensor correction in SEISINF filter bank (fig2, the design is almost same as SRM's, which is probably designed by Terrence).

Then, I tested the sensor correction an compared the vibration isolation performance in several condition (fig3, out-of-loop geophone on IP).
Colors (red, blue, green, black) represents the configurations.
Solid line shows teh spectra and dashed line shows the RMS.
Sensor correction reduces the residual vibration at microseismic band a lot.
Also, inertial sensor reduces the high frequency noises a lot.
The best performances is the controls with both sensor-corrected LVDTs and geophones, which reduces the RMS above 0.1 Hz by a factor of 4 from the controls with only LVDT damping.