On the Influence of Known Diurnal and Subdiurnal Signals in Polar Motion and UT1 on Ring Laser Gyroscope Observations

Tercjak, Monika; Brzeziński, Aleksander

doi:10.1007/s00024-017-1552-8

Cited by 9 publications

(10 citation statements)

References 18 publications

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“…They are essential in estimating rotation rates relative to the local inertial frame in many contexts ranging from inertial guidance to angular metrology, from geodesy to geophysics. The Gross Ring "G"at the Wettzell Geodetic Observatory has obtained a resolution on the Earth rotation rate of about 15 × 10 −14 rad/s with 4 hours of integration time (3 × 10 −9 in relative units) [21,14]. Such an unprecedented sensitivity shows that this class of instruments is even suitable to probe the spatio-temporal structure of the local gravity field.…”

Section: Introductionmentioning

confidence: 99%

Analysis of 90 day operation of the GINGERINO gyroscope

et al. 2018

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Gyroscopes IN GEneral Relativity (GINGER) is a proposed experiment with the aim of measuring in a ground laboratory the gravitoelectric and gravitomagnetic effects foreseen by general relativity through an array of ring laser gyroscopes. GINGERINO is a square ring-laser prototype that has been built to investigate the level of noise inside the Gran Sasso underground laboratory. GINGERINO has shown the advantage of the underground location. Now it provides suitable data for geophysics and seismology. Since May 2017, it has continuously acquired data. The analysis of the first 90 days shows that the duty cycle is higher than 95%, and the quantum shot noise limit is of the order of 10(rad/s)/Hz. It is located in a seismically active area, and it recorded part of the central Italy earthquakes. Its high sensitivity in the frequency band of fraction of hertz makes it suitable for seismology studies. The main purpose of the present analysis is to investigate the long-term response of the apparatus. Simple and fast routines to suppress the disturbances coming from the laser have been developed. The Allan deviation of the raw data reaches some 10 after about 10 s of integration time, while the processed data show an improvement of 1 order of magnitude. Disturbances at the daily time scale are present in the processed data, and the expected signal induced by polar motion and solid Earth tides is covered by those disturbances.

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Section: Introductionmentioning

confidence: 99%

Analysis of 90 day operation of the GINGERINO gyroscope

et al. 2018

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“…Ring laser gyroscopes (RLGs) are inertial sensors based on the Sagnac effect [1][2][3]. They are largely used for inertial navigation, and applications in geodesy, geophysics and even for General Relativity, where tests are foreseen [4]. Since 2011 we are studying the feasibility of the test of Lense-Thirring dragging of the rotating Earth at the level of 1% with an array of large frame RLGs [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Identification and correction of Sagnac frequency variations: an implementation for the GINGERINO data analysis

et al. 2020

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Ring laser gyroscopes are top sensitivity inertial sensors used in the measurement of angular rotation. It is well known that the response of such remarkable instruments can in principle access the very low frequency band, but the occurrence of nonlinear effects in the laser dynamics imposes severe limitations in terms of sensitivity and stability. We report here general relationships aimed at evaluating corrections able to effectively account for nonlinear laser dynamics. The so-derived corrections are applied to analyse thirty days of continuous operation of the large area ring laser gyroscope GINGERINO leading to duly reconstruct the Sagnac frequency ω s. The analysis shows that the evaluated corrections affect the measurement of the Earth rotation rate Ω ⊕ at the level of 1 part in 1.5 × 10 3. The null shift term ω ns plays a non negligible role. It turns out proportional to the optical losses μ of the ring cavity, which are changing in time at the level of 10% within the considered period of thirty days. The Allan deviation of estimated Ω ⊕ shows a remarkable long term stability, leading to a sensitivity better than 10 −10 rad/s with more than 10 s of integration time, and approaching (8.5 ± 0.5) × 10 −12 rad/s with 4.5 × 10 5 s of integration time.

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“…Ring laser gyroscopes (RLGs) are inertial sensors based on the Sagnac effect [1][2][3]. They are largely utilised for inertial navigation, and applications in geodesy, geophysics and even for General Relativity tests are foreseen [4]. Since 2011 we are studying the feasibility of the Lense Thirring test at the level of 1% with an array of large frame RLGs [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Analysis of ring laser gyroscopes including laser dynamics

et al. 2019

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Inertial sensors are important at application level and also in fundamental physics. Ring laser gyroscopes, which measure angular rotation rates, are among the most sensitive ones. Large area ring laser reach sensitivities at the level of fractions of prad/s, allowing measurements of relevant geophysical signals. Improvements of a factor 10-100 would make these instruments able to measure general relativity effects; this is the goal e.g. of the GINGER project, an Earth based experiment aiming to test the Lense-Thirring effect with an accuracy of 1%. However, the laser induces non-linearities, effects larger in small scale instruments. We discuss a novel technique to analyse data, able to reduce nonlinear laser effects. We apply this technique to data from two ring laser prototypes, and compare the precision of the measurement of the angular rotation rate obtained with the new and the standard methods. We show that the back-scatter problem of the ring laser gyroscopes is negligible with a proper analysis of the data. These results not only allow to improve the performance of large scale ring laser gyroscopes but also pave the way to the development of small scale instruments with nrad/s sensitivity, which are precious for environmental studies and as inertial platforms.

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On the Influence of Known Diurnal and Subdiurnal Signals in Polar Motion and UT1 on Ring Laser Gyroscope Observations

Cited by 9 publications

References 18 publications

Analysis of 90 day operation of the GINGERINO gyroscope

Analysis of 90 day operation of the GINGERINO gyroscope

Identification and correction of Sagnac frequency variations: an implementation for the GINGERINO data analysis

Analysis of ring laser gyroscopes including laser dynamics

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