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本文设计了一套汽油挥发气远程监测系统,利用汽油挥发气在中红外波段的吸收光谱进行浓度检测,研究了现场测试条件下检测系统的性能参数对测量结果的影响.文中采用功率加权法计算吸收光谱的吸光度值,并通过仿真和实验分析了采样过程中影响气体浓度监测的相关因素.结果表明,气体流量对平衡时间和测量浓度的影响较小,在达到平衡后测量误差小于7%;而采样距离对结果影响较大,在15 m时,误差达到了18%,修正后误差可控制在4%以内;真空度与浓度之间呈现良好的线性度.通过实验和仿真数据分析,可以对实际测量的浓度进行修正,减小测量误差,为现场测试提供数据参考.
In this paper, a remote monitoring system of gasoline volatilization gas is designed to detect the concentration of gasoline volatilization gas in the mid-infrared absorption spectrum, and the influence of the performance parameters of the detection system on the measurement results under field test conditions is studied. Absorbance spectroscopy was used to absorb the absorbance value of the sample and the related factors of gas concentration monitoring during sampling were analyzed by simulation and experiment.The results showed that the gas flow had less influence on the equilibrium time and concentration and the measurement error was less than 7% While the sampling distance has a great influence on the result. At 15 m, the error reaches 18%, and the corrected error can be controlled within 4%. The linearity between the vacuum degree and the concentration shows good linearity.According to the experimental and simulation data analysis, The concentration of the actual measurement to be amended to reduce the measurement error, provide data for the field test reference.