为了使半导体激光器辐射波长和发光强度的稳定性不受环境温度的影响, 设计了一款高精度半导体激光器温控系统。采用AD620和LTC1864芯片设计了温度采集电路, 用MAX1968和LTC1655设计了温度控制电路, 而用TMS320F2812实现对整个系统的精确控制;提出了自适应模糊比例-积分-微分控制策略并完成了软件实现。在环境温度约15℃时, 分别设定25℃和20℃进行试验, 温度控制精度达±0.05℃。结果表明, 该温控系统响应速度快、稳定性高。

To solve the problem that stability of radiation wavelength and luminous intensity of a laser diode were affected easily by temperature, a high precision laser diode temperature control system was designed. Temperature acquisition circuit was designed by means of AD620 and LTC1864 and temperature control circuit by MAX1968 and LTC1655. The whole system was controlled accurately by a TMS320F2812 controller. Adaptive fuzzy proportion-integration-differentiation control strategy was proposed and the software was achieved. At the environmental temperature around 15℃, control precision of temperature was up to ±0.05℃ when the target temperature was set to 25℃ and 20℃ respectively. Experimental results show that the temperature control system has the advantages of fast response and high stability.