激光供能半导体激光器环境温度自适应控制技术研究

Research on Environment Temperature Adaptive Control Technology for LDs in Laser Energy Supply Systems

凭借能实现高低压间的电隔离和抗电磁干扰等优点,半导体激光器(LD)是有源电子式直流测量系统常用的供能光源。由于有源电子式直流测量系统工作在室外环境,LD的工作温度也会受环境影响,从而影响LD的输出功率,最终对系统测量结果产生影响,因此需对LD进行环境温度自适应控制,以保证其工作在正常温度范围,使有源电子式直流测量系统输出的测量数据稳定。针对有源电子式直流测量系统中LD的环境温度自适应控制技术进行了深入研究。探究了LD的温度控制原理,通过多物理场建模仿真研究了环境温度、管芯温度和热电制冷器(TEC)驱动电流之间的关系;在此基础上提出了一种环境温度自适应温控算法,将根据环境温度进行的稳态调控和根据管芯温度进行的瞬态调控相结合,可以提高管芯温度调控过程的整体稳定性;最后基于Keil MDK软件和STM32开发板进行了实验研究,研究结果表明提出的环境温度自适应温控算法可以改善LD瞬时功率稳定性,LD瞬态功率波动从0.72%下降为0.38%,验证了方案的可行性。

Semiconductor lasers(LDs)are commonly used as power sources in active electronic DC measurement systems due to their advantages of electrical isolation and electromagnetic immunity.Due to the fact that the active electronic DC measurement system often operates outdoors,the working temperature of the LDs will be affected by the environment,leading to the measurement errors of the system.Therefore,it is necessary to perform environmental temperature adaptive control on the LDs to ensure that it operates within the normal temperature range and the system obtains stable measurement.In this paper,a study of environment temperature adaptive control technology for LDs in active electronic DC measurement system is carried out.Based on the principle of temperature control for LDs,the relationship between environmental temperature,tube core temperature,and thermoelectric cooler(TEC)driving current was simulated and studied through multiple physical fields.Then an environment temperature adaptive PID control algorithm,which combines steady-state regulation based on environment temperature with transient regulation based on core temperature,is proposed to improve the stability of the core temperature.Experimental research is also conducted using Keil MDK software and an STM32development board.The results indicate that the proposed control algorithm can decrease the transient power fluctuation of LD from 0.72% to 0.38%,confirming the viability of the proposed solution.