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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 make the laser output by distributed feedback (DFB) laser better stabilize at the required frequency and improve the ability of laser to suppress interference, a multilevel temperature control hardware structure is designed. Combining the temperature control structure, a feedforward PID temperature control Program. The output wavelength of the DFB laser used in the inspection system is susceptible to temperature deviations from the central absorption peak of the gas, causing the gas detection limit to decrease. A two-stage temperature control hardware structure is designed. A tem- perature-controlled (TEC) semiconductor temperature controller is used to conduct cascade temperature control. The first temperature is introduced as a feedforward into the second temperature structure (the laser itself) for control. Tested, the feedforward multi-loop PID control than the original single-loop PID control of the laser temperature control suppression interference increased by about 2-2.5 times. The actual use of proof that the control structure and control methods can effectively improve the temperature anti-interference ability to achieve accurate temperature control, improve the stability of the laser output frequency, in a variety of complex environments, can have a strong Lu Great.