Apparatus for investigating particles in a fluid, and a method o

Details Apparatus for investigating particles in a fluid, and a method o Apparatus for investigating particles in a fluid, and a method o

1996-08-26

1999-03-09

Hardy, David B.

Optics: measuring and testing

For size of particles

By particle light scattering

356 73, 356 39, G01N 3348

Patent

active

058808353

ABSTRACT:
In order to investigate particles in a fluid, a flow cell causes the fluid to flow past a sensor which receives light from a continuous light emission system. When the sensor detects a change in light, a particle detector is triggered, which in turn triggers a pulse generator and hence an intermittent light emission system. Light then illuminates the flow cell to allow a CCD camera to photograph the particle. The photographs taken by the CCD camera are analyzed by an image processor. In order to obtain an accurate particle concentration measurement, it is necessary to modify the initial concentration measurement derived from the analysis of particle images by the image processor by a compensation coefficient. This operation is carried out by a concentration compensator. The result may then be displayed. Additional analysis may be carried out by changing the magnification of the CCD camera, or by selecting for analysis only those particles of a selected size or type.

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patent: 5521699 (1996-05-01), Kosaka et al.

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