摘要
利用光声光谱技术对CO2进行浓度检测过程中的精度问题进行研究,提出光纤光路石英增强光声光谱系统方案,利用与CO2光声中心频率范围内的激光器发射的激光产生声波,使石英音叉晶振产生谐振,通过石英音叉的压电效应检测到电信号并通过锁相放大器进行信号放大,利用互相关法抑制过程噪声,达到检测微量级CO2高精度浓度的目的。实验结果表明,石英晶体的光声光谱法检测CO2浓度达到了ppm量级。
By using photoacoustic spectroscopy technology detect the concentration of CO2 of the accuracy problem,puts forward the optic quartz enhanced photoacoustic spectroscopy system scheme, use and frequency range of CO2 in the center of photoacoustic laser emitted by the laser generated acoustic waves, make the quartz tuning fork crystal resonant, through the piezoelectric effect of quartz tuning fork to detect electrical signals and by lock-in amplifier for signal amplificatio, using cross-correlation method inhibits the process noise, achieve high accuracy detection of trace level CO2 concentration objective. Experimental results show that the concentration of photoacoustic spectroscopy detection of CO2 quartz crystal to the order of ppm.
出处
《沈阳理工大学学报》
CAS
2015年第2期61-64,共4页
Journal of Shenyang Ligong University
关键词
锁相放大器
光声光谱
石英音叉
压电效应
互相关法
phase-lockedamplifier
photoacoustic spectroscopy
quartz tuning fork
piezoelectric effect
cross-correlation method
