METHOD AND DEVICE FOR DETERMINING THE SIZE OF A TRANSPARENT PARTICLE
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Feb 17, 2014
filing date -
Aug 17, 2011
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Abstract
A method is described for determining the size of a transparent particle (2), wherein the particle (2) is illuminated with light from a light source (6), wherein using a radiation detector (7) a time-resolved intensity curve of light from the light source (6) scattered on the particle (2) is measured at a preselectable scattering angle θs, wherein characteristic scattered light peaks are determined in the intensity curve, and wherein the size of the particle (2) is determined on the basis of the time difference between two scattered light peaks, characterized in that, with the help of two radiation detectors (7) or light sources (6), a first and a second time-resolved intensity curve of scattered light, scattered on the particle (2) in the forward direction, are measured; a transmission peak (12) and a reflection peak (11) are determined from the first intensity curve and from the second intensity curve; a first time difference between the transmission peaks (12) is determined, and a second time difference between the reflection peaks (11) is determined; a characteristic variable α is determined from the ratio of the first time difference and the second time difference; and a size determination is performed for the particles (2) for which the characteristic variable α corresponds to a preselectable value.
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