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Light scattering by aerosol particles and air in the molecular condensation nuclei (MCN) detector

机译：分子凝聚核（MCN）检测器中气溶胶颗粒和空气的光散射

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摘要

The principal foundations, specific features and application fields of the advanced highly sensitive method of gas impurities detection - molecular condensation nuclei (MCN) method are discussed. MCN method is based on the conversion of impurity molecules to condensation nuclei of much larger size followed by the nuclei enlargement in the supersaturated vapor of specially selected low-volatile organic substances and detection of produced aerosol particles using an optical (nephelometric) method. The light scattering properties of the aerosol particles and air in the photometer of an MCN detector as well as sensitivity of the photometer's photodetector are investigated. We have determined that the light scattering by aerosol particles is interferometric by nature and is comparable within an order of magnitude with light scattering by the air inside a photometer. The threshold sensitivity of fotointegrator was reduced a level where the detection limit for the gas analyzer target component is determined by the background level of spontaneous condensation and not by the sensitivity of the detector's photoreceiver.
机译：讨论了先进的高灵敏度气体杂质检测方法-分子缩合核（MCN）方法的主要基础，特点和应用领域。 MCN方法基于将杂质分子转化为尺寸更大的缩合核，然后在特殊选择的低挥发性有机物的过饱和蒸气中使核扩大，并使用光学（比浊法）检测产生的气溶胶颗粒。研究了MCN检测器的光度计中气溶胶颗粒和空气的光散射特性以及光度计的光检测器的灵敏度。我们已经确定，气溶胶颗粒的光散射本质上是干涉测量的，并且在一个数量级内可与光度计内部空气的光散射相媲美。摄影积分器的阈值灵敏度降低了一个水平，在该水平上，气体分析仪目标组分的检测极限是由自然冷凝的背景水平决定的，而不是由探测器的光接收器的灵敏度决定的。

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