Cell breakdown

Details Cell breakdown Cell breakdown

1982-05-03

1985-06-25

Karlsen, Ernest F.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

324 714, G01N 2707

Patent

active

045256667

ABSTRACT:
A particle analyzing apparatus for studying a stream of membrane-sheathed particles in liquid suspension wherein, for a given particle, a first particle pulse signal is obtained from a first sensing aperture having a first low frequency electrical field with an intensity below that causing particle electrical breakdown; a second particle pulse signal is obtained from a second sensing aperture having a second low frequency electrical field with an intensity equal to or greater than that causing particle electrical breakdown; a third particle pulse signal is obtained from one of the sensing apertures by having a high frequency electrical field therein or, alternatively, from a third sensing aperture having a third low frequency electrical field with a second and different intensity equal to or greater than that causing particle electrical breakdown. The three signals are correlated on a cell by cell basis and are used to determine the particles' apparent breakdown field intensity size and opacity, which in turn can yield particle volume, shape and internal conductivity.

REFERENCES:
patent: 3502974 (1966-05-01), Coulter et al.
patent: 3549994 (1970-12-01), Rothermal et al.
patent: 3793587 (1974-02-01), Thom et al.
patent: 3821644 (1974-06-01), Gohde et al.
patent: 4220916 (1980-09-01), Zimmermann et al.

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