采用过滤称重法配合激光消光法对两种粒度的磷酸铵盐微粒灭火剂在杯式燃烧器中的灭火浓度进行了研究，得出了激光测定磷酸铵盐微粒灭火剂的质量浓度标定曲线和微粒灭火剂的灭火浓度。结果表明，在该实验条件下，平均粒度分别为6.0 μm和13.7 μm的磷酸铵盐微粒灭火剂其激光吸收发散系数K值分别为0.353 0 m²/g和0.257 3 m²/g，平均灭火质量浓度分别为32.9 g/m³和41.6 g/m³，前者的灭火效能比后者高出25 % ～ 30 %，且前者采用激光消光法测定时相对误差较小。

Extinguishing concentration measurement experiments in the cup burner on two kinds of superfine ammonium phosphate extinguishing agents with different particle sizes had been done by means of filtering and weighing method combined with laser attenuation measurement. The fitting curves of particle concentration with laser attenuation rate and the extinguishing concentration of superfine particle agents had been got. The extinguishing mass concentration of two super fine agents were measured in cup burner. The results showed that when the median particle size of two kinds of extinguishing agents were 6.0 μm and 13.7μm, their laser absorption coefficients were 0.353 m²/g and 0.257 3 m²/g respectively and their mean extinguishing concentration were 32.9 g/m³ and 41.6 g/m³ respectively. Extinguishing ability of the former was 25 % to 30 % higher than that of the latter. The laser attenuation measurement relative errors were less when the former agent was used in experiment.