Patent ID: 11906412
Assignee: MALVERN PANALYTICAL LIMITED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. An apparatus for characterising particles, comprising: a light source, a sample cell, a detector and a processor; wherein
the light source is operable to illuminate a sample within the sample cell with a light beam so as to produce scattered light by interactions of the light beam with the sample;
the detector is configured to detect the scattered light and produce a time series of measurements; and
the processor is configured to:
obtain a scattering measurement comprising a time series of measurements of the scattered light from the detector;

identify contaminated scattering measurements, in which a contaminant was contributing to the scattered light; and
determine a particle characteristic from scattering measurements that have not been identified as contaminated scattering measurements by:
determining an autocorrelation function for each scattering measurement that has not been identified as a contaminated scattering measurement;
combining the autocorrelation functions to produce an average autocorrelation function from which the particle characteristic is derived.