Method and apparatus for balancing particle detecting signals ge

Details Method and apparatus for balancing particle detecting signals ge Method and apparatus for balancing particle detecting signals ge

1976-09-29

1978-03-07

Rolinec, Rudolph V.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Erosion

235 92PC, 128 2G, G01N 2700

Patent

active

040782115

ABSTRACT:
In multiple aperture electronic particle detecting apparatus, there are variations in the physical construction of the apertures intended to be identical, as a result of which the signals produced by the identical sized particle, if passed through all of the apertures, will not be identical. Each apparatus in which a multiple aperture arrangement is used requires many adjustments to be made in balancing the apparatus to compensate for the variations in the signals produced. A method and electronic circuit are disclosed which enable simplified balancing of the detecting means of the apparatus without the need for the many adjustments required heretofore. Particles of unknown size in suspension are passed through the apertures and the current supplied to all but one of the apertures is adjusted to render the signals produced of equal amplitude. The detecting means may be balanced by passing particles of a known suspension, which have a known size, through the apertures and adjusting the current supplied to all but one of the apertures to render the signals produced of equal amplitude. It is immaterial whether the particles are monosized or have a moderately broad size distribution.

REFERENCES:
patent: 3549994 (1970-12-01), Rothermel et al.
patent: 3567321 (1971-03-01), Hogg
patent: 3836850 (1974-09-01), Coulter
patent: 3882385 (1975-05-01), Coulter et al.
patent: 3949197 (1976-04-01), Bader

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