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Title: A New Pressure Sensor
Source: 1990 International Symposium on Fluid Flow Measurement
Year Published: 1990
Abstract: This paper proposes a new sensing method of small differential pressure by use of magnetic fluid. When a magnetic fluid plug is used as a leak proof seal, its characteristic is analyzed with the Bernoulli equation. The result shows the differential pressure is a function of magnetic field. The authors put a magnetic fluid plug to seal a small pressure difference. They measured the displacement of the magnetic plug caused by the pressure difference, or the current deviation of electromagnetic coil to hold the magnetic fluid plug. Their experiments show above mentioned displacement or current could be a measure of the differential pressure.

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