Regular Article - Experimental Physics
Identification and correction of Sagnac frequency variations: an implementation for the GINGERINO data analysis
INFN Pisa, Largo B Pontecorvo 3, 56127, Pisa, Italy
2 Università di Pisa, Dipartimento di Fisica “E. Fermi”, Largo B Pontecorvo 3, 56127, Pisa, Italy
3 INFN-National Lab. of Legnaro, viale dell’Università 2, 35020, Legnaro, PD, Italy
Accepted: 18 January 2020
Published online: 21 February 2020
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 . The analysis shows that the evaluated corrections affect the measurement of the Earth rotation rate at the level of 1 part in . The null shift term plays a non negligible role. It turns out proportional to the optical losses of the ring cavity, which are changing in time at the level of within the considered period of thirty days. The Allan deviation of estimated shows a remarkable long term stability, leading to a sensitivity better than rad/s with more than 10 s of integration time, and approaching rad/s with s of integration time.
© The Author(s) 2020
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Funded by SCOAP3