Fig. 1. Triangular prism ring cavity

Fig. 2. Diagram of light path of ladder prism

Fig. 3. Structural diagram of finite element analysis model

Fig. 4. Diagram of mesh division of finite element model

Fig. 5. Additional displacement caused by stress field of model

Fig. 6. Stress field distribution of model

Fig. 7. Additional displacement corresponding to dash-and-dot line

Fig. 8. Stress field distribution corresponding to dash-and-dot line

Fig. 9. Precision and combined facula of TRPLG in normalgyro temperature change test. (a) Precision curve; (b) combined facula

Fig. 10. Precision and combined facula of TRPLG in abnormal gyro temperature change test. (a) Precision curve; (b) combined facula