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Passive and active seismic isolation for gravitational radiation detectors and other instruments

Robertson, N. A. and Drever, R. W. P. and Kerr, I. and Hough, J. (1982) Passive and active seismic isolation for gravitational radiation detectors and other instruments. Journal of Physics E: Scientific Instruments, 15 (10). pp. 1101-1105. ISSN 0022-3735. doi:10.1088/0022-3735/15/10/032.

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Some new passive and active methods for reducing the effects of seismic disturbances on suspended masses are described, with special reference to gravitational radiation detectors in which differential horizontal motions of two or more suspended test masses are monitored. In these methods it is important to be able to determine horizontal seismic accelerations independent of tilts of the ground. Measurement of changes in inclination of the suspension wire of a test mass, relative to a direction defined by a reference arm of long period of oscillation, makes it possible to carry this out over the frequency range of interest for earth-based gravitational radiation detectors. The signal obtained can then be used to compensate for the effects of seismic disturbances on the test mass if necessary. Alternatively the signal corresponding to horizontal acceleration can be used to move the point from which the test mass is suspended in such a way as to reduce the effect of the seismic disturbance and also damp pendulum motions of the suspended test mass. Experimental work with an active anti-seismic system of this type is described.

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Additional Information:© 1982 The Institute of Physics Received 26 February 1982, in final form 20 May 1982 We acknowledge the financial support of the University of Glasgow and the Science and Engineering Research Council. We wish to thank R V Pound, Harvard University, for helpful private communications on some aspects of the system and D Murray Smith, Glasgow University, for useful advice on control systems.
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University of GlasgowUNSPECIFIED
Science and Engineering Research Council (SERC)UNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:ROBjpe82
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1651
Deposited By: Archive Administrator
Deposited On:09 Feb 2006
Last Modified:08 Nov 2021 19:12

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