Patent ID: 7610822

Claim:
A method for measuring parameters which describe a particle size distribution of particles in a liquid, which method comprises the steps of: performing a series of particle reflection measurements, in each of which a signal beam is generated in the liquid and a measured value (A) of a property of a reflection of the signal beam by a particle in a path of the signal beam in the liquid is measured; performing a maximum likelihood estimation of the parameters in view of a combination of the measured values (A), based on an expression for a probability of the measured values as a function of the measured values, which expression contains a first factor (P) for a probability of a particle reflection measurement of which a reflection with the measured value forms a part, corrected with a second factor (Q) for a probability that there is not also a particle reflection in the liquid with a dominating value of the property, which would mask the measured value, forming part of the particle reflection measurement.