Displacement Sensor Device

A displacement sensor device (1) comprising

• a fibre bragg grating sensor (2) for sensing displacements in the surrounding environment where the displacement sensor device (1) is fastened,
• a downshift unit (3) for downshifting the displacements towards the fibre bragg grating sensor (2) which the displacement sensor device (1) is affected by when installed, wherein the downshift unit (3) is connected to the fibre bragg grating sensor (2),
• a first (4) and a second fastening device (5) for fastening of the displacement sensor device (1) in the surrounding environment, wherein the first fastening device (4) is connected to the downshift unit (3), and the second fastening device (5) is connected to the fibre bragg grating sensor (2),
• a container (6) enclosing the fibre bragg grating sensor (2), the downshift unit (3), at least partially the first (4) and the second fastening device (5), and at least partially an optical fibre (7),
• characterised in that the sensor device (1) comprises
• at least one fixing component (8), for holding the fastening devices (4, 5) in position so that a predefined distance between the fastening devices (4, 5) is fixed, wherein the at least one fixing component (8) is arranged between one of the fastening devices (4, 5) and the container (6), further wherein the at least one fixing component (8) is arranged to break or deform when a force applied to the displacement sensor device (1) is greater than a predefined value.