| 摘要 |
PURPOSE:To permit easy selection of pulse signals to be counted by projecting laser light on the sample water flow which is adjusted in the flow rate in the central part higher than the flow rate in the peripheral part and screening and counting the impulsive scattered light from the fine particles contained in the sample water according to pulse widths. CONSTITUTION:The laser light flux from a light source 1 is expanded 2, 3 in diameter and is converted to a flat luminous flux 4 which is absorbed through a detecting cell 5 in a trap 9. Part of the sample water rises in a cylindrical body 6 and spouts upward from the upper aperture of a funnel-shaped injection nozzle 7 when said water is force-fed into a transparent cylindrical body 6 forming a detection cell 5 from the lower part thereof. The remaining water leaks from hole gaps 8 of the side wall of the nozzle 7 and rises between the side wall of the cylindrical body 6 and the side wall of the nozzle 7. The flow rate of the sample water in the central part of the body 6 can be thereby increased to an extremely high flow rate with respect to the flow rate in the peripheral part. The fine particles existing in the central part among the fine particles existing in the sample water, therefore, pass the laser light flux together with the sample water and generate the impulsive scattered light of the extremely small width. The fine particles existing in the peripheral part where the flow rate is low generate the pulse scattered light of the wide width.
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