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由于分布反馈式(DFB)激光器的工作温度会影响其激射波长,降低无自旋交换弛豫(SERF)原子磁力仪的磁场测量灵敏度,以TMS320LF2812为核心控制器,采用数字比例-积分-微分(PID)控制技术,设计并研制了一种高精度、高稳定性DFB激光器温度控制系统。在硬件电路设计方面,由温度控制前向通路和温度采集后向通路组成,构成完整的闭环温度控制结构。软件设计中,采用ZieglerNichols工程整定方法,实现对P、I和D三个参数的整定。以中心波长为852 nm的DFB激光器为被控对象,利用该温度控制系统对其进行了温度控制实验。实验结果表明:系统的有效控温范围为5~60℃,控温精度为±0.02℃,稳定时间为20 s。并且在长时间(220 min)测试中,DFB激光器工作温度稳定性优于7.9×10~(-4)(RMS),为其在SERF原子磁力仪的实用化方面提供了性能保障。
Since the working temperature of DFB lasers affects the lasing wavelength and decreases the magnetic field measurement sensitivity of the SERF atomic magnetometer, the TMS320LF2812 is used as the core controller. The digital proportional-integral-derivative (PID) control technology, a high precision and high stability DFB laser temperature control system was designed and developed. In the aspect of hardware circuit design, the forward path and the temperature are collected by the temperature control and then formed into a path to form a complete closed-loop temperature control structure. Software design, using ZieglerNichols engineering tuning method to achieve the P, I and D parameters of the three tuning. The DFB laser with the center wavelength of 852 nm is the controlled object, and the temperature control experiment is carried out by using the temperature control system. The experimental results show that the effective temperature control range of the system is 5 ~ 60 ℃, the temperature control accuracy is ± 0.02 ℃ and the settling time is 20 s. And the DFB laser is more stable than 7.9 × 10 -4 RMS at long time (220 min), which guarantees its practical application in SERF atomic magnetometer.