气溶胶粒子数浓度.冷凝粒子计数器的校准

[中文适用范围]： 本国际标准描述了确定凝结粒子计数器（CPC）在粒子数浓度范围在 1 cm-3 和 105 cm-3 之间的检测效率的方法，以及相关的测量不确定度。 一般来说，检测效率取决于颗粒数量浓度、颗粒尺寸和颗粒成分。 本国际标准中描述的方法涵盖的粒径范围约为 5 nm 至 1000 nm。 因此，这些方法既可用于确定在检测效率相对恒定（平台效率）的较大颗粒尺寸范围内应用的 CPC 校准因子，又可用于表征小颗粒尺寸下 CPC 检测效率的下降，接近检测下限。 这些参数在附录 A 中有更详细的描述。 这些方法适用于入口流量约为 0.1 l/min 至 5 l/min 的 CPC。 本国际标准描述了一种估计根据本国际标准进行的 CPC 校准的不确定度的方法。 [外文原描述]： ISO 27891:2015 describes methods to determine the detection efficiency of condensation particle counters (CPCs) at particle number concentrations ranging between 1 cm -3 and 10 5 cm -3 , together with the associated measurement uncertainty. In general, the detection efficiency will depend on the particle number concentration, the particle size, and the particle composition. The particle sizes covered by the methods described in this International Standard range from approximately 5 nm to 1 000 nm. The methods can therefore be used both to determine a CPC calibration factor to be applied across the range of larger particle sizes where the detection efficiency is relatively constant (the plateau efficiency), and to characterize the drop in CPC detection efficiency at small particle sizes, near the lower detection limit. These parameters are described in more detail in Annex A. The methods are suitable for CPCs whose inlet flows are between approximately 0,1 l/min and 5 l/min. This International Standard describes a method for estimating the uncertainty of a CPC calibration performed according to this International Standard.