Method and apparatus for determining the quality of a colloidal

Details Method and apparatus for determining the quality of a colloidal Method and apparatus for determining the quality of a colloidal

1994-07-21

1996-06-18

Regan, Maura K.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

355203, 324705, G01R 2708, G01N 2700

Patent

active

055281338

ABSTRACT:
A method and apparatus for determining the quality of a colloidal suspension. According to the method of the present invention, an oscillating input electrical signal is applied simultaneously to a sample of the colloidal suspension to be tested and to a reference resistor. The reference resistor has a predetermined impedance value that is substantially identical to the colloidal suspension. The input signal causes charge particles and molecules within both substances to move, thereby, giving rise to electrical currents. Thus, a test current is extracted from the colloidal suspension and a reference current is extracted from the reference resistor. Thereafter, a differential output current is derived by subtracting the reference current from the test current. The average value of the differential output current and the peak value of the test current are measured. Based on the peak value of the test current and the average value of the differential output, the quality of the colloidal suspension is determined.

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