| 摘要 |
a first coil(109) wound around the cylinder(1) to generate magnetic flux using AC current; a second coil(110,111) wound around the first coil at the right and left sides to induce induction voltage; a piston(104) causing inductive electromotive force proportional to the displacement of the piston; an amplifier amplifying each signal from the second coil(110,111); and a phase detector detecting the inductive electromotive force and determining the position of piston.
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