摘要
为了满足可调谐半导体流光吸收光谱(TDLAS)气体测量的需求,设计了以STM32F103RCT6为主控芯片的分布反馈式(DFB)激光器驱动及温控系统,包括正弦波与锯齿波信号发生电路、温度采集电路和温度控制电路等,使用直接数字合成(DDS)芯片和STM32片上DAC分别生成正弦波和锯齿波信号,二者叠加后控制恒流源驱动激光器,同时对激光器内部温度进行采集和控制。驱动中心波长1653.7 nm DFB激光器对甲烷气体进行验证,实验证明,该系统能产生稳定激光驱动信号并实现温度精确控制,温度控制精度可达±0.015℃,设计满足TDLAS气体检测系统对激光器驱动及温控的需求。
In order to satisfy the requirements of tunable diode laser absorption speotrometry(TDLAS)gas measurement,the DFB laser drive and temperature control system is designed with taking STM32 F103 RCT6 as the main control chip,including sine wave and sawtooth signal generation circuit,temperature acquisition circuit and temperature control circuit,etc.The sine wave and the sawtooth wave signal are respectively generated by using the direct digital synthesis(DDS)chip and the STM32 on-chip DAC,and the two are superimposed to control the constant current source to drive the laser.At the same time,the internal temperature of the laser is collected and controlled.The DFB laser with a center wavelength of 1653.7 nm is used to verify the CH4.The experiment proves that the system can generate stable laser driving signals and achieve precise temperature control.The temperature control accuracy can reach±0.015°C.The design satisfies the requirements of TDLAS gas detection system for laser driving and temperature control.
作者
熊佳慧
卜雄洙
杨昊青
宋扬
Xiong Jiahui;Bu Xiongzhu;Yang Haoqing;Song Yang(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《电子测量技术》
2020年第9期161-165,共5页
Electronic Measurement Technology
