摘要
CS_2气体是一种大气恶臭污染物,也是全封闭气体绝缘组合电器故障诊断的重要特征气体。但检测环境的温度变化直接影响监测数据的准确性。研究利用CS_2在紫外波段有明显的特征吸收特性,采用连续光源以及差分吸收光谱技术对不同浓度的CS_2气体,在不同温度环境下进行监测。CS_2气体浓度的反演采用最小二乘法,并对反演结果进行最小二乘法拟合得到温度补偿公式。实验结果显示CS_2气体差分吸收强度随温度的上升呈二次曲线式减小,导致浓度误差逐渐增大,在气体浓度较低时尤为明显。将温度补偿公式用于实际浓度的测量,实验浓度的误差由补偿前的最大17%降至5%以内。
CS_2 gas is not only an atmospheric odor pollutant,but also a crucial characteristic gas for fault diagnosis of Gas Insulated Switchgear.However,the temperature change in the detection environment directly affects the accuracy of the monitoring data.The paper uses CS_2 gas to have noticeable characteristic absorption characteristics in the ultraviolet band.Continuous light sources and differential absorption spectroscopy techniques are utilized to monitor different concentrations of CS_2 gas at different temperatures.The inversion of the CS_2 gas concentration is carried out by the least squares method,and the inversion result is subjected to least squares fitting to obtain a temperature compensation formula.The experimental results show that the UV differential absorption of CS_2 gas decreases with the increase of temperature into a quadratic curve,resulting in a gradual increase in concentration error.This is particularly noticeable when the gas concentration is low.The temperature compensation formula is used for the measurement of the actual concentration,and the error of the experimental concentration was reduced to within 5% from the maximum 17% before compensation.
引文
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