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单片机控制的光声光谱气体检测系统的设计
吴琼 1,2
,刘先勇 1
,袁长迎 1
郝张红 1
(1 西南科技大学 信息工程学院,绵阳 四川 621010;
2 宿迁学院 计算机科学与技术系,宿迁,江苏 223800)
摘要:根据 HITRAN 数据库中甲烷分子近红外吸收谱线,选用波长 1651nm 二极管激光器
作为光源,研制了一种新型近红外光声光谱甲烷气体浓度检测系统.以单片机 AT89C52 为
核心处理器,融合了模/数转换电路、通信电路 显示电路、看门狗监控电路等组合技术,可
进行声、光报警,具有通信功能.实验表明,该系统的稳定性和灵敏性都大大提高,实现了
对甲烷浓度的检测和显示,检测的灵敏度为 1460 ppm/m.在煤矿瓦斯监测、大气环保监测、
天然气泄漏监测等方面都具有广泛的应用前景.
关键词:光声光谱;甲烷;气体;单片机;近红外光声光谱
中图分类号:TP212.14 文献标识码:A
Design of Photoacoustic Spectroscopy Based on single-chip computer
WU Qiong1,2
,LIU Xian-yong1
, YUAN Chang-ying1
,HAO Zhang-hong1
(1 School of Information Engineering, South-west University of Science& Technology,
Mianyang 621010, China;
2 Department of Computer Science and Technology Su Qian College,Su Qian,JiangSu,223800,
China)
Abstract:Based on the analysis of the near infrared spectral absorption of methane in HITRAN
Database, A 1651 nm Laser Diode is used as a light source. A novel methane gas-sensitive sensor
Near-infrared Photoacoustic Spectroscopy is developed by using the combination of single-chip
computer AT89C52, A/D transform circuit, communication circuit, display circuit, Canmengou
monitoring circuit, etc. The concentration of methane can be monitored and displayed on the
screen. A sensitivity of 1460 ppm/m has been achieved with this instrument. It also has the
function of the sounding the alarm bell and communication. The study shows that the stability and
the sensitivity of the sensor have been greatly improved. It is possessed of wide application in the
areas of monitoring of coal mine gas, atmosphere environment, leakage of natural gas.
Key Words:photoacoustic spectroscopy;methane;gas;single-chip computer;near-infrared
photoacoustic spectroscopy;
0 引言利用光声光谱法检测气体一直是研究的热点.光声光谱法是一种新的简单、灵敏而又不
破坏样品的分析测试手段.它的基本原理是基于 1880 年,美国科学家,贝尔电话公司的创

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