| 摘要 |
1389482 Uses of luminescence W DITTRICH 29 Feb 1972 [5 March 1971] 9242/72 Heading C4S [Also in Division G2] Apparatus for counting and characterizing small particles by their fluorescence includes a tubular measuring chamber, an inside wall thereof having at least one flat surface region which is occupied by a multi-fibre light conductor (e.g. glass or quartz), means for emitting light from some fibres and receiving it by others, means for directing a dispersion stream of the particles through the measuring chamber and arranging that at any optical reflections of the dispersion stream from any light reflecting surface regions of the inside wall of the measuring chamber, the ratio between reflected and incident light at each reflection is substantially less than 1. In Fig. 1, the particle-containing stream 5 is enveloped by another fluid, and is illuminated from fibres 7. Fibres 8 receive light from the particles. The other walls, e.g. 6 are light-absorbing. In Fig. 2, the particle-containing stream occupies the whole of the chamber. Fibre bundle 9 both emits and receives light, and wall 10 is light-absorbing. The stream may be inspected by a microscope. Applications are given, and operational provisions discussed. |
