纳秒级窄脉冲QCL高精度驱动电源

High-precision Drive Power Supply for Nano-second and Narrow Pulsed QCL

为了能够利用郎伯-比尔定律和红外光谱法基本原理应用于中红外一氧化碳气体检测,设计了一种纳秒级窄脉冲量子级联激光器(QCL)高精度驱动电源。本系统主控制器模块以TMS320F28335处理器为核心微控制器,硬件电路以双闭环控制系统来提高驱动电源的精度和稳定性,软件算法采用数字PID来实现频率、占空比、幅值均可调节的恒定驱动电流。利用本驱动电源对中心波数为4.65微米的QCL激光器进行驱动实验。结果显示,该系统线性度为99.95%,长期输出电流稳定度达到8×10-5,可应用于中红外一氧化碳气体检测。

In order to be able to utilize the Lambert-Beer's law and the basic principle of infrared spectroscopy to detect carbon monoxide gas detection,a high-precision drive power supply for nano-second and narrow pulsed quantum cascade laser( QCL) is designed. The main controller module of the system is the micro-controller of the TMS320F28335 processor as the core. Hardware circuit with double closed-loop control system to improve the accuracy and stability of the drive power supply. The software algorithm uses the digital PID to realize the constant driving current which can adjust the frequency,the duty cycle and the amplitude. The driving experiment of QCL laser with4. 65 micron center wave number is made by using the power source. The results show that the linearity of the system is99. 95% and the long term output current stability is reached 8 × 10-5,which can be applied to the detection of carbon monoxide gas.