用于TDLAS甲烷检测的激光器电流驱动与温控系统  

A laser drive current and temperature control system for TDLAS methane detection

作　　者：姜建国[1] 赵宇[1] 刘松斌[1] 

机构地区：[1]东北石油大学电气信息工程学院,黑龙江大庆163318

出　　处：《重庆大学学报（自然科学版）》2018年第2期53-60,共8页Journal of Chongqing University

基　　金：黑龙江省自然科学基金(E2016013)~~

摘　　要：为了满足激光器在甲烷气体检测中对输出波长稳定的需求,自主设计以STM32F103RCT6为微处理器核心的电流驱动系统和温控系统,包括信号发生电路、滤波电路、温度采集与控制电路等,运用信号发生芯片生成锯齿扫频信号、正弦调制信号、直流偏置信号,把他们叠加作为激光器注入电流,同时对激光器整体构建二级制冷系统,通过温度和电流的调谐使激光器发出的波长在甲烷气体吸收峰1 653.72nm附近扫描,以使气体充分吸收。经验证,整个系统工作稳定,可持续工作时间超过36h,温度误差为±0.008℃,电流驱动误差≤0.09mA,波长误差在千分位,满足设计需求。In order to satisfy the requirements of laser on the output wavelength stability in the methane gas detection, a current driving and temperature control system is designed with taking STM32F103RCT6 as the microprocessor core, including signal generating circuit, filter circuit, and temperature acquisition and control circuit, etc. The signal chip is used to generate sawtooth frequency sweep signal, sine modulated signal and DC bias signal, and all the signals are stacked as laser injection current. At the same time, a secondary cooling system for laser is built to make the laser wavelength scan near the methane gas absorption peak（1 653.72 nm） through the tuning of temperature and current, and thus the gas can be fully absorbed. Experiments show the whole system works stably, and it can work sustainably more than 36 h with temperature error of ± 0.008 ℃, current drive error of 0.09 mA or less and wavelength error in micrometer level, which meets the design requirements.

关 键 词：激光器 电流驱动 温控系统 抗积分饱和PID 

分 类 号：TN248.2[电子电信—物理电子学]