摘要
为准确快速地检测气体浓度，对可调谐激光吸收光谱法进行了分析。从理论分析可知，偶次谐波分量在谐振位置有最大值，且幅度逐次下降，因此采用二次谐波检测的方法来获取气体浓度。建立了气体浓度检测实验系统，对浓度在0％-15％之间的甲烷气体试样进行了实验研究。理论分析及实验结果表明，二次谐波的幅度值与气体浓度值之间的线性相关度可达0．994，说明通过二次谐波可以准确获得气体的浓度信息。
The tunable diode laser absorption spectroscopy is adopted for quick and precise gas concentration measurement. Theoretical analysis shows that the even harmonics reach maximum at the resonant location and its am- plitude drops successively, and therefore the concentration of gas can be obtained by the second harmonic detection method. An experimental system is established to detect the concentration of 0% - 15% CH4 gases. Theoretical a- nalysis and experimental results show that the linear dependency between the amplitude of second harmonic and the concentration value of gas can reach 0. 994, indicating that accurate concentration value of gas can be obtained by second harmonic.
出处
《电子科技》
2013年第12期107-109,共3页
Electronic Science and Technology
基金
德州市科技发展计划基金资助项目(2011B03)
关键词
光谱学
可调谐激光光谱
谐波分析
浓度检测
spectroscopy
tunable laser spectroscopy
harmonic analysis
concentration detection
