用于光纤电流传感器SLD光源的温度控制系统

为减小高压电网中光纤电流传感器超辐射发光二极管（super luminescent diode，SLD）光源温度特性对测量准确度的影响，提出了一种模拟温度控制系统对光源温度进行恒温控制。根据设计要求，介绍了各重要环节的设计过程。分析了通过搭建合适的温度采集电桥，可以得到与温度近似成线性关系的输出差分信号。在频域上建立了系统的数学模型，计算了系统的传递函数，得到了比例-积分-微分（proportional-integral-derivative，PID）控制器各参数对时域上输出的影响。在实验室中搭建了用于光纤电流传感器SLD 光源的温控系统，对温控系统进行了定温与温度循环实验，实验结果表明:该控制系统可以实现对温度的实时控制，使光纤电流传感器测量准确度满足0.2 级工业要求。

Temperature control system for SLD optical source of FOCS

To lower the influence of optical source temperature property on the precision of fiber optic current sensor(FOCS) in high voltage grid, an analog temperature control system was proposed to control the optical source working temperature. According to the designed goal, design process of each key section was introduced. A proper temperature signal bridge was analyzed which could obtain a linear relationship between the output differential voltage and temperature. The mathematical model of the system was established in the frequency domain; the transfer function of the system was calculated; and the parameters of proportional-integral-derivative (PID) controller were analyzed in the time domain. A temperature controller used for FOCS super luminescent diode (SLD) optical source was designed, which was verified by fixed temperature test and temperature cycle test. The results show that by means of the real time temperature control, the accuracy of FOCS is up to 0.2 level which reaches industry requirements.