Particle size measuring device

Details Particle size measuring device Particle size measuring device

1993-09-20

1995-01-03

Rosenberger, Richard A.

Optics: measuring and testing

For size of particles

By particle light scattering

356343, 250574, G01N 1502

Patent

active

053791134

ABSTRACT:
A particle size measuring device which includes a laser and photo-sensors for measuring the spatial intensity distribution of diffracting and scattering light upon the specimen. An arithmetic unit is provided for calculating particle size distribution on the basis of the measured spatial intensity distribution, and a first judging device for monitoring outputs from selected photo-sensors so as to see if the monitored outputs exceed a first reference so as to know that the specimen is present in the optical system. A second judging device is use for storing the outputs of all the photo-sensors when the specimen is present in the optical system, and seeing if a maximum value of the outputs falls within a range defined by a second and third reference so as to know that the concentration of the specimen is optimal for measuring. A storage device is provided for storing the outputs of all the photo-sensors as effective data only when the maximum value falls within the reference range, and a third judging device is provided for seeing if predetermined sets of effective data have been stored in the storage. The arithmetic unit is operated when it is found that the predetermined sets of effective data are stored in the storage.

REFERENCES:
patent: 4188121 (1980-02-01), Hirleman, Jr. et al.
patent: 4288162 (1981-09-01), Sakamoto et al.
patent: 4595291 (1986-06-01), Tatsuno
patent: 5105093 (1992-04-01), Niwa
patent: 5164787 (1992-11-01), Igushi et al.

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