管理分析的选择性

V. Kozubovskyy
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摘要

在传统的可燃气体总浓度分析仪(可燃气体浓度的混合物)中,混合物中每个成分的信号值的依赖性由其浓度确定。该信号应包含在LEL的0.5%至50%的范围内。该分析仪的校准是在该范围内的一些气体上进行的。通常甲烷或丙烷用于此目的[1,2]。本文考虑了通过对气体分析仪光路中的有用信号进行负过滤[3]的方法来控制气体成分分析的选择性的可能性。有许多分析任务需要对测量的气体成分实现相同的灵敏度。例如,在上述分析仪中,空气中可燃气体的总浓度。事实上,不同的可燃气体可能会产生类似的影响,并且不可能确定每种气体的浓度。最常见的是易燃气体,如甲烷、丁烷、丙烷。当然,希望燃烧气体报警器对这些气体具有相同的灵敏度,并且不对干扰(例如CO2)作出响应。
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Manage the Selectivity of the Analysis
In the traditional analyzers of the total concentration of combustible gases (a mixture of concentrations of combustible gases), the dependence of the signal value for each component of the mixture is determined by from their concentrations. This signal should be enclosed in the range from 0.5% LEL to 50% of the LEL. The calibration of this analyzer is carried out on some gas that lies within the this range. Usually methane or propane is used for this purpose [1,2]. In the article the possibility of controlling the selectivity of the analysis of gas components by the methods of negative filtration [3] of the useful signal in the optical path of the gas analyzer is considered. There are many analytical tasks for which it is necessary to achieve the same sensitivity to the measured gas components. For example, in the analyzer mentioned above, the total concentration of combustible gases in the air. Indeed, different combustible gases can lead to similar effects and it is not possible to determine the concentration of each. The most common are flammable gases such as methane, butane, propane. Of course, it is desirable that the combustion gas alarm has the same sensitivity to these gases and does not respond to interfering, such as CO2.
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