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A high precision, compact electromechanical ground rotation sensor

Dergachev, V. and DeSalvo, R. and Asadoor, M. and Bhawal, A. and Gong, P. and Kim, C. and Lottarini, A. and Minenkov, Y. and Murphy, C. and O'Toole, A. and Peña Arellano, F. E. and Rodionov, A. V. and Shaner, M. and Sobacchi, E. (2014) A high precision, compact electromechanical ground rotation sensor. Review of Scientific Instruments, 85 (5). Art. No. 054502. ISSN 0034-6748.

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We present a mechanical rotation sensor consisting of a balance pivoting on a tungsten carbide knife edge. These sensors are important for precision seismic isolation systems, as employed in land-based gravitational wave interferometers and for the new field of rotational seismology. The position sensor used is an air-core linear variable differential transformer with a demonstrated noise floor of 1×10^(−11)m/√Hz. We describe the instrument construction and demonstrate low noise operation with a noise floor upper bound of 5.7×10^(−9)rad/√Hz at 10 mHz and 6.4×10^(−10)rad/√Hz at 0.1 Hz. The performance of the knife edge hinge is compatible with a behaviorur free of noise from dislocation self-organized criticality.

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Additional Information:© 2014 AIP Publishing LLC. Received 11 December 2013; accepted 25 April 2014; published online 15 May 2014. The instrument mechanics was manufactured by Galli & Morelli, Acquacalda, Lucca, Italy on mechanical design produced by Mr. Gianni Gennaro, San Giuliano Terme Pisa. This work has been done by members of LIGO Laboratory in California Institute of Technology, supported by funding from United States National Science Foundation. 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 PHY-0757058. We have greatly benefited from comments and advice by Frank Seifert, Eric Gustafson, Virginio Sunnibale, and Randall D. Peters. We would also like to thank Brian Lantz, Fabrice Matichard, and Richard Mittleman. We are very thankful to Takanori Sekiguchi for comments and suggestions for the early draft of this paper. The work of E. Sobacchi was supported by INFN, Italy, in the framework of a student exchange program with NSF. This document has LIGO Laboratory document number LIGO-P1300160-v3.
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NSF Cooperative AgreementPHY-0757058
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LIGO Laboratory document numberP1300160-v3
Issue or Number:5
Record Number:CaltechAUTHORS:20140528-090001233
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Official Citation: A high precision, compact electromechanical ground rotation sensor V. Dergachev, R. DeSalvo, M. Asadoor, A. Bhawal, P. Gong, C. Kim, A. Lottarini, Y. Minenkov, C. Murphy, A. O'Toole, F. E. Peña Arellano, A. V. Rodionov, M. Shaner and E. Sobacchi Rev. Sci. Instrum. 85, 054502 (2014);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45928
Deposited By: Ruth Sustaita
Deposited On:28 May 2014 17:22
Last Modified:03 Oct 2019 06:38

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