用于激光TDLAS检测系统的模块化驱动单元电路设计  

Design of Modularized Laser Driver Unit Circuit for Laser GasD etection based on TDLAS

作　　者：房思超 刘昱峰 王彪[1] 

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

出　　处：《激光杂志》2016年第5期52-55,共4页Laser Journal

基　　金：国家自然科学基金项目(61306060);吉林省科技厅重点项目(20150204048SF)

摘　　要：TDLAS(Tunable Diode Laser Absorption Spectrometry)——可调谐半导体二极管激光吸收光谱技术是国际上逐渐兴起的一项新型气体检测技术。该技术使用激光束穿过气体后的衰减进行检测,但激光束只被"特定频率"的气体所大幅吸收,因此具有更高的检测灵敏度和更优的单一气体选择性,而且反应速度快、抗干扰能力强、工作稳定性高。本文主要设计了一种用于CO_2气体检测的激光器驱动模块电路。采用ARM7系列的LPC2148作为主控芯片,驱动DAC7513E来产生锯齿扫描信号,同时驱动AD9851产生调制所需的特定频率的正弦波,通过OP27进行两者信号叠加,用以驱动激光器,之后将各节点信号通过AD7928进行采样回传监控。该模块电路可以使用RS485通讯来控制相关参数及数据回传,不仅可以用于CO_2气体检测,还可以推广应用到其他气体检测。TDLAS（ Tunable Diode Laser Absorption Spectrometry） is a high-end technique for gas detection. This technique is based on measuring laser spectrum that formed by the laser energy is absorbedselectively by gas molecules,tomeasurethe gas concentration. Ithashigher detection sensitivity and better single gas selectivity,fast response speed,and high stability.In this paper,we design a kind of laser driver module circuit for CO_2 gas detection. We adopt LPC2148 which is in series of ARM7 as the main control chip,to drive DAC7513 E to generate the sawtooth sweep signal,to drive AD9851 to generate the required specific frequency sine wave for modulation at the same time,use OP27 to superimpose two above signal to generate the driver signal for laser.Then in each node,signal is sampled by AD7928 to feedback for monitoring.This module circuit can use RS485 protocol communication to control the related parameters and senddatafeedback,Itnot only can be used in CO_2 gas detection,but also can be applied to other gas detection.

关 键 词：TDLAS LPC2148 气体激光检测 激光调制 

分 类 号：TN271.5[电子电信—物理电子学]