Analysis of 90 day operation of the GINGERINO gyroscope

Belfi, Jacopo; Beverini, N.; Carelli, Giorgio; Virgilio, A. Di; Giacomelli, Umberto; Maccioni, Enrico; Simonelli, Andreino; Stefani, Fabio; Terreni, G.

doi:10.1364/ao.57.005844

Cited by 19 publications

(25 citation statements)

References 20 publications

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“…The so far obtained long term instability is about 10 times larger than the scale factor changes induced by temperature variations considering 5 × 10 −6 / o C the thermal expansion coefficient of granite, the material used for the RLG frame, and 0.02 o C as typical temperature variation in the 30 day period. The obtained modified Allan deviation represents a fair improvement compared to the analysis in [12] (the improvement is around a factor 7) carried out by using available signals on a pure phenomenological basis, for instance the long time behaviour was cancelled using the DM signal.…”

Section: Reconstruction Of the Sagnac Frequency By A Linear Regressiomentioning

confidence: 76%

“…The general goal of the analysis is to evaluate the Sagnac frequency correcting systematics due to the laser nonlinear dynamics by using the available data: the measured beat note and the mono-beam signals [9,12]. Figure 1 shows a scheme of the experimental apparatus, where photodiodes collecting the relevant signals are indicated.…”

Section: The Analysis Scheme To Take Into Account Laser Dynamicsmentioning

confidence: 99%

“…We included also these data to show that, even in non ideal conditions, very high sensitivity and stability can be obtained. The data are acquired with our DAQ system at 5 kHz sampling rate [12]. The whole set of data has been analysed on a hourly base, and the terms ω m , ω ns /μ, and ω K 1 /M K (assuming μ = 10 −4 ) were evaluated and stored for offline analysis.…”

Section: The Selected Playground and The First Step Of The Analysismentioning

confidence: 99%

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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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Section: Reconstruction Of the Sagnac Frequency By A Linear Regressiomentioning

confidence: 76%

Section: The Analysis Scheme To Take Into Account Laser Dynamicsmentioning

confidence: 99%

Section: The Selected Playground and The First Step Of The Analysismentioning

confidence: 99%

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

et al. 2020

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“…GINGERINO is a square RLG with a side of 3.6 m developed after the first INFN prototype GPisa in operation since 2009 [18]. It is running inside the deep underground INFN laboratory of the Gran Sasso (LNGS) [5,17]. It aims to characterise the underground rotational seismic and anthropic disturbances so to validate the site in view of the GINGER apparatus.…”

Section: Earth Science and The Lngs Prototype Gingerinomentioning

confidence: 99%

GINGER - Toward an experimental test of General Relativity

Porzio¹,

Altucci²,

Capozziello³

et al. 2018

Proceedings of Corfu Summer Institute 2017 "Schools and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2017)

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GINGER (Gyroscopes IN General Relativity) is a proposal for measuring the Lense-Thirring effect using an array of ring laser-gyroscopes. Those are, nowadays, the most sensitive inertial sensors to measure the rotation rate of the Earth. The Lense-Thirring contribution to the Earth gravitational field marks itself as a tiny DC perturbation onto Ω, the Earth rotation rate. Its magnitude is 10 −9 × Ω so that to be able to discriminate it a very high sensitivity and long measurement times in order to move toward low frequency are required. For such an experiment, an underground location guarantees further isolation from anthropic as well as environmental disturbances. GINGERINO is a single axis ring laser located inside the the INFN Gran Sasso laboratory. It has demonstrated that the very high thermal stability of the cave allows continuous operation, and sensitivity well below fractions of nrad/s are feasible with duty cycle above 90% even without stabilisation of the scale factor of the ring laser. Here we show the GINGER experiment concept together with the first evaluation of the GINGERINO sensitiviy that shows how such a device can be of use also in earth science and related phenomena.

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“…To study this new idea and to validate the site, a square 3.6 m side ring-laser based on an heterolithic structure, named GINGERINO [6],has been mounted in the underground INFN Gran Sasso National Laboratories (LNGS). It showed that continuous data taking is feasible with high sensitivity and duty cycle over 95% [6,7]. In general the response of a RLG to a rotation is given by the Sagnac frequency f s :…”

Section: Introductionmentioning

confidence: 99%

Length measurement and stabilization of the diagonals of a square area laser gyroscope

Beverini

Carelli

Virgilio

et al. 2020

Class. Quantum Grav.

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Large frame ring laser gyroscopes are top sensitivity inertial sensors able to measure absolute angular rotation rate below prad/s in few seconds. The GINGER project is aiming at directly measuring the Lense-Thirring effect with an 1% precision on an Earth based experiment. GINGER is based on an array of large frame ring laser gyroscopes. The mechanical design of this apparatus requires a micrometric precision in the construction and the geometry must be stabilized in order to keep constant the scale factor of the instrument. The proposed control is based on square cavities, and relies on the length stabilization of the two diagonals, which must be equal at micrometric level. GP2 is the prototype devoted to the scale factor control test. As a first step, the lengths of the diagonals of the ring cavity have been measured through an interferometric technique with a statistical accuracy of some tens of nanometers, and they have been locked to the wavelength of a reference optical standard. Continuous operation has been obtained over more than 12 hours, without loss of sensitivity. GP2 is located in a laboratory with standard temperature stabilization, with residual fluctuations of the order of 1 • C. Besides the demonstration of the control effectiveness, the analysis of the Sagnac frequency demonstrates that relative small and low-cost ring lasers (around one meter of side) can also achieve a sensitivity of the order of nrad/s in the range 0.01−10 Hz in a standard environment, which is the target sensitivity in many different applications, such as rotational seismology and next generation gravitational waves detectors.

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Analysis of 90 day operation of the GINGERINO gyroscope

Cited by 19 publications

References 20 publications

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

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

GINGER - Toward an experimental test of General Relativity

Length measurement and stabilization of the diagonals of a square area laser gyroscope

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