Fiber optic torsion angle sensor and method of detecting a torsion angle

摘要

There is provided a fiber optic torsion angle sensor for detecting torsions of a measuring object, the torsion angle sensor comprising an optical sensor fiber having a first light coupling end and a second light coupling end, at least one light source adapted for coupling linearly polarized light into the first and / or second light coupling ends the sensor fiber; a first detector configured to detect a first polarization rotation of linearly polarized light output at the second light coupling end; a second detector configured to detect a second polarization rotation of linearly polarized light output at the first light coupling interface end; and an evaluation unit, which is designed to determine a torsion angle of the measurement object based on the detected first and second polarization rotations.