METHOD AND DEVICE FOR DETERMINING CHARACTERISTIC PROPERTIES OF A TRANSPARENT PARTICLE

摘要

The invention relates to a method for determining the size d of a transparent particle, according to which method the particle is illuminated with light from a light source, a radiation detector measures a time-resolved intensity profile of light of the light source scattered by the particle, a reflection peak (10) and a refraction peak are determined in the intensity profile and the size d of the particle is determined based on a time difference between the reflection peak (10) and the refraction peak. The method according to the invention is characterized in that the time-resolved intensity profile is measured at a definable scattering angle θs, a first second-order refraction peak (11) and a second second-order refraction peak (12) having a mode different from that of the first refraction peak (11) being determined, a characteristic variable γ being determined as the ratio of a first time difference Δt01 between the reflection peak (10) and the first refraction peak (11) and of a second time difference Δt02 between the reflection peak (10) and the second refraction peak (11), and the size of only those particles being determined for which the characteristic variable γ corresponds to a definable value.

主权项

1. A method for determining characteristic properties of a transparent particle, wherein the particle is illuminated with light from a light source, wherein a time-resolved intensity profile of light from the light source that is scattered at the particle is measured by a radiation detector at a predefinable scattering angle θs, wherein characteristic scattered light peaks are determined in the intensity profile, and wherein a size of the particle is determined based on a time difference between two scattered light peaks,
wherein a first time difference is determined between a first pair of scattered light peaks and a second time difference is determined between a second pair of scattered light peaks, a characteristic variable is determined from the ratio of the first time difference and the second time difference, and a determination of size is carried out only for those particles for which the characteristic variable lies within a predefinable value range.