title: Modeling and experiment of the suspended seismometer concept for attenuating the contribution of tilt motion in horizontal measurements.
abstract: Tilt-horizontal coupling in inertial sensors limits the performance of active isolation systems such as those used in gravitational wave detectors. Inertial rotation sensors can be used to subtract the tilt component from the signal produced by horizontal inertial sensors, but such techniques are often limited by the sensor noise of the tilt measurement. A different approach is to mechanically filter the tilt transmitted to the horizontal inertial sensor, as discussed in this article. This technique does not require an auxiliary rotation sensor and can produce a lower noise measurement. The concept investigated uses a mechanical suspension to isolate the inertial sensor from input tilt. Modeling and simulations show that such a configuration can be used to adequately attenuate the tilt transmitted to the instrument, while maintaining translation sensitivity in the frequency band of interest. The analysis is supported by experimental results showing that this approach is a viable solution to overcome the tilt problem in the field of active inertial isolation.
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: F
authors.initials: F
authors.lastname: Matichard
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: M
authors.initials: M
authors.lastname: Evans
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: R
authors.initials: R
authors.lastname: Mittleman
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: M
authors.initials: M
authors.lastname: MacInnis
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: S
authors.initials: S
authors.lastname: Biscans
authors.affiliation: LIGO Laboratory, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: K L
authors.initials: KL
authors.lastname: Dooley
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: H
authors.initials: H
authors.lastname: Sohier
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: A
authors.initials: A
authors.lastname: Lauriero
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: H
authors.initials: H
authors.lastname: Paris
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: J
authors.initials: J
authors.lastname: Koch
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: P
authors.initials: P
authors.lastname: Knothe
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: A
authors.initials: A
authors.lastname: Carbajo
authors.affiliation: LIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: C
authors.initials: C
authors.lastname: Dufort