a Laser Gyroscope System to Detect the Gravito-Magnetic Effect on Earth
A. Di Virgilio,K. U. Schreiber,André Gebauer,Jon-Paul R. Wells,Angelo Tartaglia,Jacopo Belfi,Nicolo' Beverini,Antonello Ortolan +7 more
TLDR
In this paper, the authors analyzed a system of two pairs of identical gyros (twins) with a slightly different orientation with respect to the Earth's axis, and the twin-gyro configuration has several interesting properties.Abstract:
Large scale square ring laser gyros with a length of four meters on each side are approaching a sensitivity of . This is approximately the regime required to measure the gravito-magnetic effect (Lense–Thirring) of the Earth. For an ensemble of linearly independent gyros each measurement signal depends upon the orientation of each single axis gyro with respect to the rotational axis of the Earth. Therefore at least three gyros are necessary to reconstruct the complete angular orientation of the apparatus. In general, the setup consists of several laser gyroscopes (we would prefer more than three for sufficient redundancy), rigidly referenced to each other. Adding more gyros for one plane of observation provides a cross-check against intra-system biases and furthermore has the advantage of improving the signal-to-noise ratio by the square root of the number of gyros. In this paper we analyze a system of two pairs of identical gyros (twins) with a slightly different orientation with respect to the Earth's axis. The twin-gyro configuration has several interesting properties. The relative angle can be controlled and provides a useful null measurement. A quadruple twin system could reach a 1% sensitivity after 3.2 years of data taking, provided each square ring has 6 m length on a side, the system is limited by shot noise and there is no source for 1/f-noise.read more
Citations
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Invited Review Article: Large ring lasers for rotation sensing
TL;DR: The first experimentally viable proposals to make terrestrial tests of general relativistic effects such as the frame dragging of the rotating Earth are proposed.
Journal ArticleDOI
Measuring Gravito-magnetic Effects by Multi Ring-Laser Gyroscope
Filippo Bosi,G. Cella,A. Di Virgilio,Antonello Ortolan,A. Porzio,Salvatore Solimeno,Massimo Cerdonio,J. P. Zendri,Maria Allegrini,Jacopo Belfi,Nicolo' Beverini,B. Bouhadef,Giorgio Carelli,I. Ferrante,Enrico Maccioni,R. Passaquieti,Fabio Stefani,Matteo Luca Ruggiero,Angelo Tartaglia,Karl Ulrich Schreiber,André Gebauer,Jon-Paul R. Wells +21 more
TL;DR: In this paper, an under-ground experiment to detect the general relativistic effects due to the curvature of space-time around the Earth (de Sitter effect) and to rotation of the planet (dragging of the inertial frames or lens-thirring effect) was proposed.
Journal ArticleDOI
A ring lasers array for fundamental physics
Angela Di Virgilio,Maria Allegrini,Alessandro Beghi,Jacopo Belfi,Nicolo' Beverini,Filippo Bosi,B. Bouhadef,M. Calamai,Giorgio Carelli,D. Cuccato,Enrico Maccioni,Antonello Ortolan,Giuseppe Passeggio,Alberto Porzio,Matteo Luca Ruggiero,R. Santagata,Angelo Tartaglia +16 more
TL;DR: The GINGER project as discussed by the authors is a ring-laser-based system for measuring de Sitter and Lense-Thirring effects in space-time, which uses a three-dimensional array of large-size ringlasers.
Journal ArticleDOI
Testing general relativity by means of ring lasers
TL;DR: In this paper, the optimal configuration of one or more ring lasers to be used for measuring the general relativistic effects of the rotation of the Earth, as manifested on the surface of the planet, is discussed.
Journal ArticleDOI
GINGER: A feasibility study
Angela Di Virgilio,Jacopo Belfi,Wei-Tou Ni,Nicolo' Beverini,Giorgio Carelli,Enrico Maccioni,Alberto Porzio +6 more
TL;DR: In this article, the authors proposed a configuration of two ring laser arrays, one at maximum signal and the other at horizontal, to measure the Lense-Thirring (LT) and de Sitter effects.
References
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Journal Article
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Journal ArticleDOI
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Posted Content
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Direct measurement of diurnal polar motion by ring laser gyroscopes
K.U. Schreiber,A. Velikoseltsev,Markus Rothacher,Thomas Klügel,G. E. Stedman,David L. Wiltshire +5 more
TL;DR: The first direct measurements of the very small effect of forced diurnal polar motion, successfully observed on three large ring laser gyroscopes, were reported in this article, which measured the instantaneous direction of Earth's rotation axis to a precision of 1 part in 108 when averaged over a time interval of several hours.
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