Method and apparatus for measuring particles in a fluid

Details Method and apparatus for measuring particles in a fluid Method and apparatus for measuring particles in a fluid

1995-03-20

1997-04-15

Gonzalez, Frank

Optics: measuring and testing

For size of particles

By particle light scattering

356338, 356339, 356352, G01N 1502

Patent

active

056215231

ABSTRACT:
A particle-containing fluid in a sample cuvette is irradiated by a laser beam from a light source section. The scattered light thus produced passes through converging lenses and a mask and impinges on an etalon interferometer. The etalon only transmits scattered light (Rayleigh scattered light) that is of the same wavelength as the light emitted by the laser light source. The transmitted scattered light components impinges on a photomultiplier, and based on the intensity of the light a calculating section sorts the particles according to size and calculates the number of particles per unit flow amount, the particle size distribution and so forth. To enable adjustments to be made to compensate for the environmental dependency characteristics of the etalon, a control unit is provided which consists of a photodiode and mirrors.

REFERENCES:
patent: 3909132 (1975-09-01), Barrett
patent: 4035080 (1977-07-01), Yamaguchi
patent: 4071298 (1978-01-01), Falconer
patent: 4195931 (1980-04-01), Hara
patent: 4830494 (1989-05-01), Ishikawa et al.
patent: 5041779 (1991-08-01), Hales
patent: 5262644 (1993-11-01), Maguire
patent: 5305077 (1994-04-01), Grego et al.

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