Abstract
This article deals with a new pressure sensing method by use of magnetic fluids. In a magnetic fluid placed in a magnetic field, fluid-magnetic pressure appears, which is a function of magnetic field. When a differential pressure is applied to the ends of such a magnetic fluid plug, and the differential pressure is in equilibrium with the fluid-magnetic pressure so that the plug cannot move, then the magnitude of the magnetic field maintaining the fluid-magnetic pressure becomes a measure of the differential pressure. We made a small setup and measured differential pressures up to about 100 Pa by measuring the coil current of an electromagnet.
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