Patent ID: 6970243

Claim:
A particle size distribution measuring apparatus comprising: a sample cell for receiving a plurality of particles; a light source section for irradiating a first light having a first wavelength onto the sample cell, and for irradiating a second light having a second wavelength onto the sample cell; a detector section comprising two or more detectors for measuring the intensity of the first light scattered by one or more particles in the sample cell to generate first light intensity measurements, and for measuring the intensity of the second light scattered by one or more particles in the sample cell to generate second light intensity measurements; and a processor for receiving the first light intensity measurements and determining a first low sensitivity region for a particle size, and for receiving the second light intensity measurements and determining a second low sensitivity region for a particle size, wherein the processor determines a particle size distribution by combining the first light intensity measurements and the second light intensity measurements such that the first low sensitivity region and the second low sensitivity region are eliminated in the resulting combined data.