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.
作者
鹿洪飞
王彪
范兴龙
张国军
李奥奇
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)
出处
《激光杂志》
北大核心
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)
