Measurement of statistical parameters of a distribution of suspe

Details Measurement of statistical parameters of a distribution of suspe Measurement of statistical parameters of a distribution of suspe

1975-01-06

1977-10-04

Wise, Edward J.

Boots, shoes, and leggings

356102, 356103, 350162SF, 364525, G01N 2100, G06F 1520, G02B 520

Patent

active

040526003

ABSTRACT:
A rotating mask having three spatial filters is placed in the light path after a laser beam is passed through a sample having a collection of particles. The mask sequentially filters the light scattered by each particle to produce at a detector receiving the filtered light a response which is in accordance with the second, third and fourth power of the particle diameter. The detector integrates the response to all particles in the laser beam and the signal resulting from the integration of the response due to the individual filters is used to calculate statistical parameters. The mean of the area distribution is calculated as the third power response divided by the second power response. The mean of the volume distribution is calculated as the fourth power response divided by the third power response and the standard deviation of the area distribution as the square root of the product of the mean of the area distribution and the difference between the mean of the volume distribution and the mean of the area distribution.

REFERENCES:
patent: 3488106 (1970-01-01), Lohmann
patent: 3612689 (1971-10-01), Liskowitz
patent: 3809478 (1974-05-01), Talbot
patent: 3830569 (1974-08-01), Meric
patent: 3835315 (1974-09-01), Gravitt, Jr.
patent: 3869208 (1975-03-01), Lorenz
patent: 3873206 (1975-03-01), Wilcock

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