摘要
研究了一种基于光谱吸收的光纤甲烷远程实时在线监测系统,分析了该系统在瓦斯抽采中的应用。该系统以1665nm波长半导体激光器作为光源,以单片机C8051F410为核心处理器,采用锯齿波信号实现了气体激光吸收光谱的波长调制,结合A/D转换电路、通讯电路和显示电路,可进行声光报警、LCD液晶显示等。利用内置参考池对激光波长漂移进行自适应调整,可以实现甲烷吸收线的锁定。该系统已在国内外建立多个示范工程,试验表明,该系统具有很好的稳定性,在0%~100%量程实现了分布式多点甲烷气体浓度的实时在线监测和显示,监测的灵敏度可达ppm量级,在煤矿瓦斯抽采领域具有广泛的应用前景。
An optical fiber distributed multi-point methane real-time monitoring system based on the methane spectral absorption characteristic is researched,and it＇s application in methane extraction is presented.An 1665nm distributed feedback（DFB） laser is used as the light source by taking the triangular signal to modulate the light frequency of the DFB laser.Using the combination of single-chip computer C8051F410,A/D transform circuit,communication circuit,display circuit,etc,the concentration of methane can be monitored and displayed on the screen.And the function of sounding the alarm bell and communication are achieved.The laser wavelength shift is carried out with adaptive adjustment by the built-in gas calibration pond so as to realize the locking of a methane absorption line.Several field tests have been founded at home and abroad.The results show that the system has good performance in stability and sensitivity.The distributed multi-point methane concentration monitoring is realized in the range of 0%-100%.A sensitivity of ppm order of magnitude has been achieved.It possesses of wide application in methane extraction.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2010年第10期2857-2860,共4页
Spectroscopy and Spectral Analysis
基金
国家科技支撑计划项目(2009BAK54B01)
山东省科技发展计划项目(2007GG20006007)
山东省重大专项(2006ZZ13)资助
关键词
光谱吸收
瓦斯抽采
光纤传感器
甲烷监测
单片机
Spectral absorption
Methane extraction
Fiber sensor
Methane monitor
Single-chip computer
