| 摘要 |
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. |
| 主权项 |
1. A method for determining the size of a transparent particle, wherein the particle is illuminated with light from a light source, wherein a time-resolved intensity curve of light from the light source scattered on the particle is measured at a preselectable scattering angle θs using a radiation detector, wherein characteristic scattered light peaks are determined in the intensity curve, and wherein the size of the particle is determined on the basis of the time difference between two scattered light peaks, wherein either (i) a first and a second time-resolved intensity curve of light from the light source, scattered on the particle in the forward direction, is measured using two radiation detectors arranged on both sides of an optical axis of the light source, spaced a distance apart in the direction of the particle trajectory, or (ii) the particle is illuminated with two light sources spaced a distance apart from one another in the direction of the particle trajectory and arranged on both sides of an optical axis of the radiation detector, and the time-resolved intensity curve of light scattered in the forward direction, measured with the radiation detector, is broken down into a first intensity curve, caused by the first light source, and a second intensity curve, caused by the second light source; a transmission peak and a reflection peak are each determined from the first intensity curve and from the second intensity curve; a first time difference between two different transmission peaks and/or reflection peaks and a second time difference, which is different from the first time difference, between two different transmission peaks and/or reflection peaks, are 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 only for the particles for which the characteristic variable α corresponds to a preselectable value. |
