Particle detector independent of errors caused by changes of ele

Details Particle detector independent of errors caused by changes of ele Particle detector independent of errors caused by changes of ele

1976-03-11

1977-04-19

Rolinec, Rudolph V.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Erosion

324 64, G01N 2700

Patent

active

040191346

ABSTRACT:
For use in a particle analyzer of the well known type, in which a microscopic aperture-defined sensing zone separates two bodies of electrolyte and particles in the electrolyte are caused to pass through the sensing zone; a first pair of sensing electrodes and a second pair of power electrodes are positioned with one electrode of each pair being on opposite sides of the aperture. A feedback circuit measures the constant D.C. voltage component between the sensing electrodes and feeds same back to the power electrodes, to cause the analyzer to be independent of power electrode polarization. The sensing electrodes are coupled to an output circuit, including a high input impedance voltage detecting amplifier, to enable the analyzer to operate accurately independent of changes in electrolyte conductivity. The connections to the sensing electrodes permit only negligible current to flow in them and thereby minimize their polarization.

REFERENCES:
patent: 3745455 (1973-07-01), Haigh
patent: 3924180 (1975-12-01), Salzman et al.
Bebyakov, A.W., "Physicochemical Measurement," . . . USSR Journal - Izmeritel naya Tekhnika, No. 8, Aug., 1972, pp. 58-60.

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