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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 use the basic principles of Lambert-Beer law and infrared spectroscopy for mid-infrared carbon monoxide gas detection, a nanosecond narrow pulse quantum cascade laser (QCL) high-precision driving power supply was designed. The main controller module to TMS320F28335 processor as the core microcontroller, the hardware circuit to double closed-loop control system to improve the accuracy and stability of the drive power, the software algorithm using digital PID to achieve the frequency, duty cycle, amplitude can be Adjust the constant drive current. The driving power is used to drive the QCL laser with a center wave number of 4.65 microns. The results show that the system has a linearity of 99.95% and a long-term output current stability of 8 × 10-5. It can be used for the detection of mid-infrared carbon monoxide gas.