FIELD: physics.
SUBSTANCE: fibre-optic position sensor has a magnetic or electromagnetic element, a broad-band light source, optical fibre, at least two sensors in form of a fibre-optic Bragg grating made from optical fibre, at least one segment of magnetostrictive material, a rod made from magnetic field impermeable material. At least one of the two sensors is attached to the segment of the magnetostrictive material, where at least one of the segments of magnetostrictive material is attached to the rod. The magnetic or electromagnetic element and the rod are superposed in such a way that they experience displacement only along the axis of the rod. Said displacement causes changes in the dimensions of the segment of magnetostrictive, which leads to changes in the length of waves reflected by the sensors in form of a fibre-optic Bragg grating.
EFFECT: ensuring safety when using the sensor in explosion hazard zones owing to absence of electrical signals in the immediate proximity of the measurement point.
16 cl, 11 dwg
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