RFOG中LD光源驱动电路设计

谐振式光纤陀螺具有良好的发展前景,光源在系统中有着很重要的作用.由于惯导系统工作在多变的外界环境下,环境因素引起的LD输出光功率不稳定会对陀螺的精度产生极大影响.为减小这种不稳定造成的检测误差,给出了一种恒流+温控的驱动电路来稳定光源输出功率,实验测定恒流电路的电流稳定性优于0.12％.激光器组件内包含的热敏电阻阻值随温度变化而改变,通过测量温控条件下热敏电阻两端电压,计算得到温度波动为±0.05℃.同时,实验还测量了在30C时,LD光源的输出功率标准差为0.0165mW.

Design of Driving Circuit for LD Used for RFOG

The resonator fiber optical gyro (RFOG) has an outstanding future,light source plays a very important role in RFOG system.As the navigation system often works in complex environment,the output power would be unstable,which decreases the precision of RFOG.To reduce the error of measurement,this article engages a driving circuit of "constant current source+ temperature controlling circuit" to stable the output light power.In the experiments,the stability of constant current is 0.12％.The resistance of the thermistor in the LD module changes due to temperature variation.Under the condition of temperature controlling,the temperature fluctuation is ±0.05℃,by measuring the voltage of the thermistor.At the same time,the standard deviation stability of the light source power is 0.0165mW.