基于DSP2812的半导体激光器恒功率系统

doi:10.3969/j.issn.1000-1093.2020.11.014

摘要/Abstract

摘要： 针对样机陀螺仪中由于半导体激光器功率变化带来的寻北精度降低问题，设计一种基于位置敏感探测器控制的稳恒功率控制系统。其原理是：在阈值电流以上，激光器的输出功率具有与驱动电流呈正比的特性，设定基准电流，以测定电流与基准电流的差值作为反馈信号；在满足设计要求情况下，尽量减少元器件等硬件的使用，提高系统可靠性；软件设计上利用差值电流实现负反馈。通过软件与硬件结合的方式实现对激光器功率的稳恒控制。实验结果表明：与不增加功率稳恒电路相比，新的控制方式使激光器输出功率稳定度提高了50%，基本保持在4.65 mW；陀螺仪寻北精度提高大约70%，极大改善了陀螺仪的寻北性能。

关键词: 半导体激光器, 恒功率控制, 负反馈, 陀螺寻北

Abstract: For the reduction in north-seeking accuracy caused by the power change of semiconductor laser in a gyroscope prototype, a constant power control system based on DSP control is designed. Its principle is that the output power of the laser is proportional to the driving current above the threshold current, and the reference current is set. The difference between the measured current and the reference current is used as the feedback signal. The use of components in hardware is minimized to improve the reliability of the system while meeting the design requirements. In the design, the differential current is used to realize negative feedback. The constant control of laser power is realized through the combination of hardware and software. The experimental results show that the proposed control method can be used to improve the output power stability of the laser by 50% compared with the control method without power stabilization circuit. The output power stability of the laser is basically kept at 4.65 mW. The north-seeking accuracy of gyroscope is improved by about 70%, which greatly improves the north-seeking performance of gyroscope.

Key words: semiconductorlaser, constantpowercontrol, negativefeedback, gyronorthfinding

中图分类号:

TN365

谭立龙，王鹏，仲启媛，张翠. 基于DSP2812的半导体激光器恒功率系统[J]. 兵工学报, 2020, 41(11): 2266-2273.

TAN Lilong， WANG Peng， ZHONG Qiyuan， ZHANG Cui. Constant Power System for Semiconductor Laser Based on DSP2812[J]. Acta Armamentarii, 2020, 41(11): 2266-2273.

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