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    • 62. 发明授权
    • Particle analyzing method and apparatus
    • 粒子分析方法和装置
    • US4383171A
    • 1983-05-10
    • US207135
    • 1980-11-17
    • Mahadeva P. SinhaCharles E. GiffinDavid D. NorrisSheldon K. Friedlander
    • Mahadeva P. SinhaCharles E. GiffinDavid D. NorrisSheldon K. Friedlander
    • G01N1/22G01N15/14G01N30/72H01J49/16B01D59/44
    • H01J49/164G01N30/72H01J49/0445G01N1/2208G01N2001/2223G01N2030/7226G01N30/724G01N30/7293
    • A system is provided for analyzing the particles in aerosols, as in making air pollution studies, which enables the making of rapid chemical analyses of particles. The system includes an apparatus for producing a controlled stream of individual particles to be analyzed from an environment, and an apparatus for vaporizing and ionizing the particles while they move in free flight, for analysis by a mass spectrometer. The apparatus for producing a stream of particles includes a capillary tube through which the air with suspended particles moves, a skimmer device having a small opening spaced from an end of the capillary tube to receive particles passing through the tube, and a vacuum pump for pumping air out of the space between the tube and skimmer. The vacuum pump serves to remove much of the gas from around the particles, while also creating an inflow of air and particles through the capillary tube. The particles passing through the skimmer opening can be simultaneously vaporized and ionized while in free flight, by a laser beam of sufficient intensity that is directed across the path of the free flying particles.
    • 提供了一种用于分析气溶胶中的颗粒的系统,如进行空气污染研究,其能够进行颗粒的快速化学分析。 该系统包括用于从环境产生待分析的单个颗粒的受控流的装置,以及用于在颗粒自由飞行中移动并使其离子化并使其离子化的装置,用于通过质谱仪进行分析。 用于生产颗粒物流的装置包括:毛细管,悬浮颗粒的空气通过该毛细管移动,具有与毛细管的端部间隔开的小开口的分离器装置,以接收穿过该管的颗粒;以及抽真空泵 空气从管和撇渣器之间的空间排出。 真空泵用于从颗粒周围除去大部分气体,同时还产生空气和颗粒通过毛细管的流入。 通过分离器开口的颗粒可以在自由飞行中同时被蒸发并离子化,并通过被引导穿过自由飞行颗粒的路径的足够强度的激光束进行离子化。