基于STM32恒流恒温超辐射光源系统设计

Design of Constant Current and Constant Temperature System of Super Luminescence Diode Based on STM32

随着光纤传感、光纤陀螺等技术的飞速发展,超辐射发光二极管(SLD)运用场所也是越来越多,SLD光源的稳定性对光纤传感系统性能有及其重要的影响,为了提高光纤传感的精度设计了一种基于STM32的恒电流恒温度超辐射光源系统。该系统采用了运算放大器作为放大器件的恒流源电路技术方案确保电流稳定性,使用了PID算法确保温度控制电路稳定性,具有良好触摸屏控制的人机界面。文中对超辐射光源系统的硬件和软件进行了具体阐述。测试结果证明,该系统在正常温度下一定工作时间内都能保证SLD输出功率稳定在±0.01d Bm范围内,能够很好符合相关需求。

With the rapid development of optical fiber sensor and optical fiber gyro, there is a widely need of super lumines- cence diode （SLD）. The stability of SLD light source has important influence on the performance of optical fiber sensing system. A constant current and constant temperature system based on STM32 was designed in order to improve precision of the system. The method of taking operational amplifier as device for constant current source circuit technology was used to ensure the current stable. And the PID controller was used to ensure the stability of the temperature. The system also had well touchscreen-controlled human interface. This paper made a specific description about the hardware and software of the constant current and constant temperature system. The experimental results prove that the system can ensure the output power of the SLD within the scope of ±0.01 dBm in the appropriate temperature , thus meeting the correlation requirements well.