超荧光光源温度动态特性的分析及控制

Control of temperature dynamic characteristics of SFS light source

针对高精度光纤陀螺对光源稳定性的需求,提出了一种以32位数字信号处理器TMS320F2812为核心的掺铒超荧光光纤光源（SFS）的数字化温控方案.以该光纤光源（SFS）为研究对象,分析了现有的光源温度控制技术的优缺点;在模拟控制方案的基础上,提出了”数字恒流源＋数字温控”的方案.研究了热电制冷器（TEC）的工作特性、SFS泵浦源的内部结构和传热机理,建立了SFS光源管芯温控系统的数学模型.设计了相应的连续域超前-滞后校正网络,并进行控制器的离散化处理,得到了PID数字补偿控制算法.最后,实验验证了SFS光源的数字化温控系统的温控精度.结果表明,在20～90℃,系统温控精度优于±0.05℃,满足了光纤陀螺低功耗、小型化等要求.

According to the demand of a high precision optical fiber gyro for the light source＇s stability, the digital thermal control scheme for an erbium-doped super fiber source（SFS） was proposed based on the 32-bit digital signal processor TMS320F2812. By taking the erbium-doped SFS as the study ob- ject, the advantages and disadvantages of the existing light source temperature control technologies were analyzed, and the program of the ＂numeric constant current source q- digital thermostat＂ meth- od was deve Electric Coo oped according to the analog control scheme. The operating characteristics of a Thermo er （TEC）, the internal structure and heat transfer mechanism of the SFS pump source were studied, and a mathematical model of the die temperature control system of the SFS light was es tablished. Furthermore, a corresponding continuous domain lead-lag correction network was de signed, the controller was diseretized and a PID digital compensation control algorithm was realized.Finally, the control precision of the digital temperature control system for the SFS light source was verified experimentally. Obtained results show the precision is better than ＋ 0.05 ℃ in 20-90 ℃ and meets the requirements of optical fiber gyros for low power consumption and miniaturization.