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Published June 2016 | Published + Submitted
Journal Article Open

Modeling and experiment of the suspended seismometer concept for attenuating the contribution of tilt motion in horizontal measurements


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.

Additional Information

© 2016 Published by AIP Publishing. Received 3 February 2016; accepted 19 May 2016; published online 9 June 2016. This work was carried out within the LIGO laboratory. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under Cooperative Agreement No. PHY-0757058. Advanced LIGO was built under Award No. PHY-0823459. This document has been assigned LIGO Laboratory Document No. LIGO-P1400061. This work would not have been possible without the outstanding support of the LIGO visitor program. The authors are very grateful to Brian Lantz for encouraging us and our community in finding solutions to mitigate tilt noise in active isolation systems, to Dan DeBra for his very useful advices on flexure mechanisms, and to Krishna Venkateswara and Vladimir Dergachev for many useful discussions on tilt sensing problems and instrumentation. We are very thankful to Camillo Cocchieri for carefully reviewing this manuscript.

Attached Files

Published - 1.4953110.pdf

Submitted - 1602.01494.pdf


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August 20, 2023
August 20, 2023