A V Gusev et al 2008 Class. Quantum Grav. 25 055006 doi:10.1088/0264-9381/25/5/055006
A V Gusev1, V N Rudenko1, S A Cheprasov1 and M Bassan2
Show affiliationsA gravitational resonant bar detector with a large scale Fabry–Perot (FP) cavity as an optical readout and a mechanical displacement transformer is considered. We calculate, in a fully analytical way, the final receiver bandwidth in which the potential sensitivity, limited only by the bar thermal noise, is maintained despite the additional thermal noise of the transformer and the additive noise of the optical readout. We also discuss an application to the OGRAN project, where the bar is instrumented with a 2 m long FP cavity.
Issue 5 (7 March 2008)
Received 11 July 2007, in final form 21 January 2008
Published 15 February 2008
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