摘要
工作环境是光声光谱气体检测系统在工业现场应用的重要影响因素。实验发现,待测气体湿度对电容式微音器灵敏度影响显著,导致现有光声光谱气体检测系统测试结果漂移。文章提出一种气体湿度影响消除方法,在光声腔中安装扬声器,以扬声器信号幅值作为声感应器件灵敏度的自适应表征,对光声信号幅值作自行修正,有效克服电容式微音器声信号检测中灵敏度变化的问题。基于该方法,利用半导体激光器、共振光声腔和锁相放大器构建了一套光声光谱实验装置,对不同湿度的样本进行了对比测试,实验结果表明该方法切实可行,能有效消除气体湿度对光声光谱检测系统的影响,增强了检测系统的环境适应性。
Environmental influence is the important factor in a photoacoustic spectroscopy gas detection（PASGD） system when it is applied in the industrial field.The experiments show that the sensitivity of condenser microphone is affected mostly by the humidity of the gas under test,leading to the PASGD＇s result drift.The present paper puts forward a method to eliminate the influence of gas humidity.A speaker is fixed in the photoacoustic cell,whose amplitude is regarded as the sensitivity self-adaption characterization of sound sensor,used to correct the photoacoustic signal amplitude.Thus the problem of sensitivity changing in sound detection with condenser microphone is solved.Based on this method,a photoacoustic experimental setup,equipped with a diode laser,a resonant photoacoustic cell and a lock-in amplifier,was applied to compare the test for different humidity samples.The results show that this method is useful to eliminating the gas humidity influence and enhancing environmental adaptability of PASGD system.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2011年第7期1819-1822,共4页
Spectroscopy and Spectral Analysis
基金
西南科技大学与四川省煤炭产业集团重大合作项目(07zh0164)
国防预研基金(A3120060267)
四川省教育厅重大培育项目(07zz039)
四川省安监局项目(07zd0103)资助
关键词
光声光谱
电容式微音器
气体检测
Photoacoustic spectroscopy
Condenser microphone
Gas detection
