TDLAS氨气检测系统VCSEL激光器驱动电路设计  

Design of driving circuit for VCSEL laser of NH3 gas detector based on TDLAS technology

作　　者：鹿洪飞 王彪[1] 范兴龙 张国军 李奥奇[1,3] 许玥 LU Hongfei;WANG Biao;FAN Xinglong;ZHANG Guojun;LI Aoqi;XU Yue(Changehun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院大学,北京100049 [3]中国科学技术大学,合肥230026

出　　处：《激光杂志》2019年第1期22-25,共4页Laser Journal

基　　金：国家重大科研仪器研制项目(No.61727822);吉林省科技厅重大科技招标专项(No.20160203015GX)

摘　　要：采用STM32F407为主控芯片,设计了一款应用于NH3气体TDLAS检测系统的VCSEL激光器驱动电路。该驱动电路通过驱动DAC8560和AD9852产生的低频锯齿波扫描信号及高频正弦波信号,两路信号的频率最大误差分别为0. 29%、0. 18%。该电路通过OP77进行信号叠加,经LT1001电压-电流转换电路进行电压信号到电流信号的高精度转换,实际转换误差小于0. 3%,该电流信号可实现对VCSEL激光器的驱动,电路整体误差小于0. 3%。此外,主控芯片可通过程序进行参数更改及波形控制,该驱动电路还可以推广到其他气体检测应用。STM32 F407 is used as the main control chip to design a driving circuit for VCSEL laser. The driving circuit produces the low-frequency sawtooth scanning signal and high-frequency sine signal by driving DAC8560 and AD9852,and the maximum frequency error of the two signals is 0. 29% and 0. 18%. The circuit carries out signal superposition by OP77,and then the high precision conversion of voltage signal to current signal is carried out by LT1001 voltage-current conversion circuit,and the actual conversion error is less than 0. 3%. The current signal can drive the VCSEL laser,and the overall error of the circuit is less than 0. 3%. In addition,the main control chip can be programmed to change the parameters and control the waveform,and the driver circuit designed can be extended to other gas detection applications.

关 键 词：TDLAS VCSEL激光器驱动电路 NH3气体检测 STM32F407 

分 类 号：TN249[电子电信—物理电子学]