Improved Algorithm for Mathematical Correction of the Zero Drift of the Zeeman Laser Gyro with Switching Longitudinal Mode of Generation

Authors: Kolbas Yu.Yu., Ivanov M.A. Published: 17.04.2019
Published in issue: #2(125)/2019  
DOI: 10.18698/0236-3933-2019-2-91-103

Category: Instrument Engineering, Metrology, Information-Measuring Instruments and Systems | Chapter: Navigation Instruments  
Keywords: laser gyroscope, Zeeman effect, zero drift, temperature dependence, temperature sensor

The paper addresses time and temperature zero drifts in Zeeman laser gyroscope (RLG) operating in the mode of periodic adjustment of RLG to the longitudinal mode of generation with the opposite circular polarization of the light wave. In such a gyroscope, the zero drift can be divided into magnetic and non-magnetic components having different nature and making a significantly different contribution to the final error. Algorithmic methods are proposed for mathematical compensation of RLG zero drift, both with and without using initial calibration. It is shown that the simultaneous use of reproducible dependencies of the magnetic and non-magnetic zero drifts due to RLG temperature changes allows solving the problem of RLG zero drift correction in the optimal way. The correction factors are calculated from the temperature of a Zeeman laser gyro at the moment of activation. At the same time, using the difference between the temperatures of the gyroscope and gyro case, where it is installed, it is possible to determine the temperature of the Zeeman laser gyroscope at the moment of switching on, thereby eliminating the problem of calculating the correction factors when the gyroscope is turned off and then on again. Experimental results for several Zeeman laser gyroscopes with typical values of zero drifts are presented


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