Device and method for measuring a particle flow in a fluid

Details Device and method for measuring a particle flow in a fluid Device and method for measuring a particle flow in a fluid

1997-07-10

1998-09-29

Font, Frank G.

Optics: measuring and testing

By particle light scattering

With photocell detection

356339, 356442, 250574, 359232, 359233, G01N 2100, G02B 2602

Patent

active

058152652

ABSTRACT:
For simplifying the optical measurement of a particle flow in a fluid and in particular for eliminating errors, in a device for measuring a particle flow in a fluid with at least one illumination system having a diaphragm and at least one receiver system having a diaphragm, the invention provides for a diaphragm (6a, 11a) to have an aperture (6, 11) with an edge (6b, 11b) constructed convexly towards the interior of the diaphragm aperture (6, 11). According to a method, the particle flow is illuminated and/or observed through a diaphragm aperture with an edge constructed convexly towards its interior and the maximum intensity of the particle flying through a first optical measuring range is measured and account is only taken of the particle if the intensity on flowing through a second measuring range exceeds a specific minimum percentage of the maximum intensity measured for this particle.

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