| 摘要 |
<p>The invention relates to an optical particle detector. A light beam is transmitted through a spatial filter which includes a spatially distributed pattern of varying transmittances. On the back side of the filter the shadow of the low transmittances of the varying transmittances forms a spatially distributed pattern of varying light intensities in the. A particle which passes the spatially distributed pattern of varying light intensities generates a variation in light intensity of scattered or transmitted light. The scattered or transmitted light is measured and analyzed in order to determine properties particles in a fluid.</p> |
