Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1993-03-18
1994-03-15
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324709, 324713, 324452, G01R 2714
Patent
active
052948919
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 solution. The reference solution is substantially identical to the colloidal suspension except that the colloidal particles have been removed. 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 solution. Thereafter, a differential output current is derived by substracting the reference current from the test current. The peak-to-peak magnitude of the differential output current is measured, and the phase of the output current is compared to the phase of the input signal to determine the difference in phase between the two signals. Based on the peak-to-peak value and the phase difference, the quality of the colloidal suspension is determined.
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Lloyd William A.
Saklikar Arvind R.
Brown Glenn
Fernandez Dennis S.
PowerPrint Technologies, Inc.
Truong Phong K.
Wieder Kenneth A.
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