DFB激光器的高精度高稳定性前馈PID温控设计  

DFB laser's high-precision and high-stability feedforward PID temperature control

作　　者：刘欣 吕铁良[3] 刘建翔 李绍鹏[1,2] 薛莹 

机构地区：[1]山东省机器人与制造自动化技术重点实验室,济南250014 [2]山东省科学院自动化研究所,济南250014 [3]山东大学(威海),山东威海264209

出　　处：《激光杂志》2017年第9期23-27,共5页Laser Journal

摘　　要：为使分布式反馈(DFB)激光器输出的激光更好的稳定在所需频率处,提高激光器抑制干扰能力,设计了一种多级温度控制硬件结构,结合温控结构制定了前馈PID温度控制方案。检测系统中使用的DFB激光器输出波长易受温度影响偏离气体的中心吸收峰处,造成气体检测限降低。设计了两级温度控制硬件结构,使用一级温度控制结构的半导体制冷器(TEC)进行级联温控,将一级温度作为前馈量引入二级温度结构(激光器本身)进行控制。经测试,前馈多环路PID控制比原有的单回路PID控制使激光器温控的抑制干扰能力提高了约2-2.5倍。经实际使用证明,该控制结构和控制方式能有效提高温度的抗干扰能力,实现温度的精确控制,提高激光输出频率的稳定性,处于各种复杂的环境中时,都能有较强的鲁棒性。In order to stabilize the laser output from the distributed feedback laser at the desired frequency and to improve the interference immunity of the laser, a multi-stage temperature control hardware structure was designed. Combining with the structure of temperature control, a feedforward PID temperature control scheme was designed. The distributed feed back laser is susceptible to temperature and can cause the output wavelength easily depart from the center of the gas absorption peak so the gas detection limit reduced, we developed a multi-loop PID temperature feed-forward control scheme. A cascading temperature control is used in which the first level temperature is introduced to the second level temperature as a feedforward quantity. Feedforward multi-loop PID control increases the laser＇ s temperature interference suppression about 2-2. 5 times than the original single-loop PID control, which realized the accurate control of temperature and improved the stability of laser output frequency, and also had stronger robustness in various complex environment.

关 键 词：激光器 前馈 比例积分微分控制 多级温控 气体检测 

分 类 号：TN247[电子电信—物理电子学]