Exploring Mode Hopping Performance of a Prism Laser Gyro

Abstract

In view of the poor mode hopping performance of prism laser gyros, the mode hopping performance of a prism laser gyro is systematically studied. A mathematical model of frequency stabilization actuating mechanism is established, and the mode hopping is analyzed theoretically. The functional relation between the incremental voltage of the mode hopping and its temperature and starting voltage is given, and the phenomenon that the gyro's pulses fluctuate greatly in the process of mode hopping is eliminated. The open closed-loop scanning mode of the prism laser gyro is further studied. The experimental results show that the shallow light limiting mode causes the competition between two longitudinal modes, resulting in the gyro's pulse hopping. Without changing the optical limiting parameters of the resonator, adjusting the light intensity reference voltage or feedback loop pre-amplification gain can make the open closed-loop scanning mode performance appropriate and avoid the gyro's pulse hopping. The analysis result improves the precision of the gyro, reduces the rework rate of the resonator and improves the production efficiency of the gyro.

Study of hydrothermal characteristics of large‐scale water conveyance trunk canals in seasonally frozen ground regions under the influence of different initial water contents

“…This partial differential equation represents the mathematical model of soil temperature distribution: (Hansson et al, 2004;Harlan, 1973;Tao, 2006).…”

“…This partial differential equation represents the mathematical model of soil temperature distribution: (Hansson et al, 2004; Harlan, 1973; Tao, 2006). $$$\rho C(\theta )\frac{\partial T}{\partial t}=\nabla [\lambda (\theta )\nabla T]+L\cdot {\rho }_{i}\frac{\partial {\theta }_{i}}{\partial t},$$$ where T is the temperature of the soil, °C; ρ and ρ i are the density of the soil and the density of ice, respectively, kg/m 3 ; c is the specific heat capacity of the soil, J/(kg·°C); λ is the thermal conductivity of the soil, W/(m·°C); L is the latent heat of change of the phase of the water; θ i is the amount of ice contained in the soil; where the value of the soil's specific heat capacity, c , and the value of the thermal conductivity of the coefficient λ , and the soil is the state of freezing or thawing related.…”

Study on thermal behavior of an improved motorized spindle with water-lubricated hydrodynamic spiral groove bearings

“…As the shaft is running at high speed, the end surface of shaft occur forced convection with the ambient air. According to experiments of rotating plate, the Nusselt number can be determined by [25] 0.5…”

“…Similarly, according to empirical equation, the Nusselt number between the circumferential surface of rotating shaft and ambient air can be determined by the following formula [25] In Eq. ( 24), U is the circumferential linear velocity of shaft surface; d is the diameter of shaft.…”