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Open AccessArticle

Rotation Sensing Lasers in General Relativity: Some Technical Notes and Current Advances

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Forschungseinrichtung Satellitengeodaesie Geodaetisches Observatorium Wettzell, Technische Universitaet Muenchen, 93444 Bad Koetzting, Germany
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Dodd-Walls Centre for Photonic and Quantum Technologies, University of Canterbury, PB4800, Christchurch 8140, New Zealand
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School of Physical and Chemical Sciences, University of Canterbury, PB4800, Christchurch 8140, New Zealand
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Author to whom correspondence should be addressed.
Universe 2019, 5(9), 190; https://doi.org/10.3390/universe5090190
Received: 26 July 2019 / Revised: 14 August 2019 / Accepted: 20 August 2019 / Published: 21 August 2019
(This article belongs to the Special Issue Rotation Effects in Relativity)
We review the current status of large ring laser gyroscopes having the potential to contribute to terrestrial measurements of general relativistic precessions. At this point in time, although these devices possess the raw sensitivity for such a measurement, they remain limited by long-term geometric instability, detection noise and imperfections in the physical models required to isolate geophysical effects. Furthermore, minute non-reciprocal biases provide a null-shift error and therefore no currently constructed laser system meets the requirement of absolute rotation rate sensing. Nevertheless, we are of the view that these are surmountable problems and the ability of ring laser gyroscopes to measure low frequency to DC signals has vastly increased in the last decade. View Full-Text
Keywords: Sagnac interferometry; ring laser gyroscopes; earth rotation sensing Sagnac interferometry; ring laser gyroscopes; earth rotation sensing
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Schreiber, K.U.; Gebauer, A.; Kodet, J.; Anyi, C.L.; Wells, J.-P.R. Rotation Sensing Lasers in General Relativity: Some Technical Notes and Current Advances. Universe 2019, 5, 190.

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