Particle size distribution measuring method, device, and program for compensating for particle concentration

In a particle size distribution device for measuring the size of particles by irradiating the particles in a carrier medium with radiation and detecting the influence of the particles on the radiation, the improvement of enabling a compensation for the amount of particles in the medium, comprising:

• a concentration level adjusting unit for changing a relative amount of particles to an amount of carrier medium to enable measurements of an influence of particles on the radiation that are substantially free from an effect relating to a level of concentration of particles to the carrier medium;
• and
• a correction unit for generating a proportional relationship between the amount of particles in the carrier medium and the output of the detectors, substantially free from an effect relating to the level of concentration of particles to the carrier medium, based on measurements form the concentration level adjustment unit to enable a calculation of concentration correction constants.

A particle diameter distribution measuring method for measuring the particle diameter distribution of a measuring sample, based on the detection values of plural detectors provided for detecting at predetermined angles diffracted light and/or scattered light generated when light is applied to the measuring sample comprising the steps of:

• storing the output of the respective detectors at different concentrations of the measuring sample;
• determining concentration correction constants for correcting the detection values of the respective detectors at different concentrations of the sample;
• correcting detection values of the respective detectors by using the concentration correction constants, and determining the particle diameter distribution by using the corrected detection values of the respective detectors.

A particle diameter distribution measuring device for measuring particle diameter distribution of a measuring sample, based on the detection values of plural detectors provided for detecting at predetermined angles diffraction light and/or scattered light generated when light is applied to the measuring sample, comprising:

• a storage part which stores the detection values of the detectors separately for each concentration of measuring sample and carrier fluid when the measuring sample is diluted to different concentrations;
• and
• an arithmetic processing part for generating concentration correction constants to remove an influence of error resulting from the concentration of the measuring sample separately for each detector by analyzing the detection values of the detectors stored in the storage part in association with the concentrations of the measuring sample.

A particle diameter distribution measuring device for measuring the particle diameter distribution of a measuring sample, based on the detection values of plural detectors provided for detecting at predetermined angles diffraction light and/or scattered light generated when light is applied to the measuring sample, comprising:

• a storage part which stores concentration correction constants obtained by finding the amount of correction in the detection values of the detectors in accordance with different concentrations of the measuring sample, based on the detection values of the detectors measured a plural number of times by changing the concentration of the measuring sample in a carrier fluid;
• and
• an arithmetic processing part which corrects the detection values of the detectors in accordance with the concentrations of the measuring sample by using the concentration correction constants, and then calculates the particle diameter distribution by using the corrected detection values.

A measuring program executed by a particle diameter distribution measuring device for measuring the particle diameter distribution of a measuring sample, based on the detection values of plural detectors provided for detecting at predetermined angles diffraction light and/or scattered light generated when light is applied to the measuring sample, comprising measuring a measuring sample diluted to different concentrations and storing the detection values of the detectors separately for each concentration with a detection value grabbing program module;

• and
• analyzing the detection values of the detectors in association with the concentrations of the measuring samples and finding the concentration correction constants for each detector which removes the influence of error resulting from concentration with a correction constant generation program module.