光纤陀螺用SLD启动特性及影响研究

Research on Characteristic of SLD Start-up Used in FOG and its Effect

摘要:

光纤陀螺的快速启动在军事、导航等领域极其重要，超辐射发光二极管（SLD）是光纤陀螺中启动速度最慢的器件。对SLD启动特性机理进行分析，采用高速数据采集卡对功率、驱动电流、温控电流和温度的变化情况进行了测试，得到了SLD的常温启动时间约为3~4s，启动时的最大功率波动误差为4.5%，上电瞬间驱动电流上升时间约为0.3s，SLD的制冷电流与热沉温度存在0.12s的延迟，环境温度与理想温度偏差越大，启动时间越长，而且高温启动时间要比低温启动时间长。分析了不同温度下SLD启动对光纤陀螺附加零偏的影响，增加前放增益可减小附加零偏。

Abstract:

Quick start of fiber optic gyro is extremely important in the field of military and navigation, while the start-up speed of SLD is the slowest in fiber optic gyroscope devices. In this paper, the analysis was performed on the mechanism of SLD start-up characteristics, and the changes of output power, driven current, temperature control current and temperature were tested by the high-speed data acquisition card. The start-up time of SLD is about 3~4s, power fluctuation error is 4.5% at room temperature, the rise time of the driving current is about 0.3s, and the cooling current has 0.12s delay compared to the temperature of heatsink. Larger deviation of environment temperature and ideal temperature reault in longer start-up time, and the start-up under high temperature is longer than that under low temperature. The effects of SLD start-up characteristic on fiber optic gyro bias were obtained, and increasing the preamplifier gain can reduce the additional zero bias.