Patent ID: 7450792

Claim:
A fiber-optic sensor head for an optical current or magnetic-field sensor, comprising: an optical fiber having a magnetooptically active sensor fiber that is optically connected to at least one polarization-defining element, the sensor head being flexible in an area of the sensor fiber, wherein the sensor fiber is arranged in the form of a coil around a conductor which carries the current to be measured or in a magnetic field to be measured, with the sensor fiber coil defining a coil plane with a surface normal, with the at least one polarization-defining element having a marked axis; and an adjustment means for adjustment of at least one predeterminable angle between the marked axis and the surface normal or for adjustment of predeterminable angles between the marked axes and the surface normal, wherein the sensor fiber is a fiber which has not been thermally treated at at least the softening temperature of the sensor fiber material, and wherein the adjustment means contains a mount body, to which the at least one polarization-defining element is fixed, and the mount body is a flexibly deformable mount body.