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. Their experiment shows above mentioned displacement could be a measure of the differential pressure.
