用于SERF原子磁力仪的DFB激光器温度控制系统

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Ziegler-Nichols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7.910-4（RMS），为其在SERF原子磁力仪的实用化方面提供了性能保障。

Temperature controller for DFB laser utilized in SERF atomic magnetometer

As the working temperature can affect emitting wavelength of distributed feedback(DFB) laser and reduce measurement sensitivity of magnetic field of Spin-Exchange-Relaxation-Free(SERF) atomic magnetometer, a DFB lasers' temperature controller with high-precision and high stability was designed and developed by using digital proportional-integral-differential(PID) control technology, which is based on TMS320LF2812 core controller. In terms of hardware design, the temperature controller consists of temperature control forward pathway and temperature acquisition backward pathway to form a complete closed-loop temperature control structure. In consideration of software design, the three parameters P, I and D are determined by using Ziegler-Nichols engineering setting method. Using the aforementioned temperature controller, a temperature controlling test was performed on a DFB laser with a center wavelength at 852 nm. Experimental results indicate that, the control scale is 5-60℃, the accuracy is 0.02℃, and the control procedure is 20 s. Meanwhile, the stability of working temperature is better than 7.910-4(RMS) during long term(220 min) running, which provides performance guarantee for SERF atomic magnetometer in practical application.