The Parameter Optimization Design of the Dithering Frequency Bias Mechanism in a Mechanically Dithered Laser Gyroscope Based on Orthogonal Arrays

The mechanically dithered ring laser gyroscopes employ a dither mechanism for frequency bias control to address the lock-in phenomenon, where the structure of the dither mechanism is of critical importance with regard to the precision and performance of the frequency bias control. This study is concerned with the lock-in phenomenon, with a particular focus on the analysis of the operating principles of the dither mechanism and the development of a mathematical model that relates the dithering amplitude to the structural parameters. The evaluation criteria for structural parameter design were established through the implementation of the orthogonal verification method. To validate the method, finite element numerical simulations were conducted. The simulation results demonstrated that the orthogonal verification method allows for the optimal design of structural parameters, such as the length, thickness, installation position, and inner aperture of the piezoelectric ceramics. These optimizations enhance the peak dithering amplitude of the ring laser gyroscope, thereby improving frequency bias control and measurement accuracy.