基于LabVIEW与气体特征吸收光谱的甲烷浓度检测系统

Design of Methane Concentration Monitoring System Based on LabVIEW and Characteristic Absorption Spectrum

根据甲烷气体的特征吸收光谱与浓度变化之间的关系,结合虚拟仪器技术,提出了一种基于差分吸收原理的红外甲烷浓度检测系统设计方案。系统采用主从结构设计,通过软硬件功能的合理分工,实现了数据采集与数据分析功能的分离,大大简化了系统设计,降低了生产成本。试验结果表明:该系统利用FFT与Savitzky-Golay滤波算法,有效抑制了系统的噪声干扰,提高了甲烷浓度检测的精确度和灵敏度,具备了不同环境下实际应用的基础。

According to the relationship between the characteristic absorption spectrum of methane and the changes of gas con- centrations, coupled with the virtual instrument technology, a design scheme of methane concentration monitoring system was put forward in this article based on the principle of infrared differential absorption technique. The system adopted a master-slave struc- ture, and achieved the separation of data collection and data analysis through the rational allocation of hardware and software fea- tures. This approach simplified the system design greatly and reduced the cost of production effectively. The experiment results show that the system suppressed the system noise productively by using FFT and Savitzky-Golay filtering algorithm, and improved the ac- curacy and sensitivity in methane detection. It has the basis of practical application in different environments.