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温度是影响半导体激光器性能指标之一,为了实现快速稳定的温度控制,研究了系统的温度控制硬件和算法。系统以MSP430低功耗微控制处理器为核心,采用自动调节制冷片电压和脉冲宽度调制(PWM)输出脉冲方式相结合的驱动电路,根据系统的机械控制热平衡模型和装置的高低温实验建立了自适应温度调节算法。经过高低温实验研究,从-40~50℃控制到温度为23℃时,激光器温度稳定所消耗的时间分别为2 min 30 s和1 min 30 s,其中控制精度为0.2℃。对激光器功率稳定性进行实验分析,控温前后激光功率的稳定性,从5%提高到1%以内,满足人眼安全对激光功率密度的要求,该方案的设计对于小功率、快速稳定的激光系统的设计具有可借鉴意义。
Temperature is one of the performance index of the semiconductor laser. In order to achieve a fast and stable temperature control, the system temperature control hardware and algorithm are studied. The system uses the MSP430 low-power micro-control processor as the core and adopts a drive circuit that automatically adjusts the voltage of the cooling chip and the output pulse of the pulse width modulation (PWM). According to the system’s mechanical control thermal balance model and the high and low temperature experiment of the device Adaptive temperature adjustment algorithm. After high and low temperature experiments, when the temperature is controlled to -40 ℃ from -40 ℃ to 50 ℃, the time of laser temperature stabilization is 2 min 30 s and 1 min 30 s, respectively. The control precision is 0.2 ℃. Experimental analysis of the laser power stability, the stability of the laser power before and after temperature control from 5% to 1%, to meet the human eye safety requirements of the laser power density, the program design for low-power, fast and stable laser The design of the system can be used for reference.