Zeeman Laser Gyro with Switching of Longitudinal Modes of Generation

Principles of development, construction, and accuracy characteristics of a Zeeman laser gyro are described. The gyro operates in the mode of laser switching to the longitudinal mode of generation with the opposite circular polarization of the light wave (in the so-called quasi-four-frequency mode). The optimal scheme of this gyro development is given; a physical principle of its operation is explained, a formula is deduced for the total error calculation based on partitioning the error of Zeeman laser gyro into the magnetic drift, the nonmagnetic drift, and the error in switching of generation modes. Methods to compensate for a false drift of the laser gyro at moments of the generation mode switching are considered including the usage of additional information and formulas of approximation. Experimental and theoretical results of parrying false readings of gyros at the moment of generation mode switching with different angular accelerations are compared. It is shown that the post-processing (that uses the gyro readings both before the switching and after it) allows the substantial reduction in the error arising with the generation mode switching. In this case the linear approximating function is most resistant to noise and angular accelerations.

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