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In this paper, a novel adaptive front-end circuit for measuring liquid conductivity is proposed. To deal with the chemically active environment around the sensor electrodes, the dc component of the excitation signal is set to be zero. The proposed system is able to generate a symmetrical excitation signal with a single power supply even when one terminal of the sensor electrode is grounded. The use...
The progressive improvement in the purification techniques of dielectric liquids renders the measurement of their resistivity more and more difficult, sometimes impossible (especially at room temperature) with conventional AC bridges (SCHERING bridge, transformer ratio bridge) they are not sensitive enough to detect losses (tanδ) or conductance G of a cell of capacitance C filled with a liquid of...
D.C. measurements of the conductivity of semi-insulating polar liquids are notoriously difficult to make; almost undetectably small quantities of impurities act as the current carriers, and for many liquids it is not possible to assign a specific value to the conductivity. Very often the current flowing in a conductivity cell falls in a quasi-exponential manner when a constant direct potential is...
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