Abstract: A displacement sensor device (1) comprising a fibre bragg grating sensor (2) and a downshift unit (3). The downshift unit (3) is connected to the fibre bragg grating sensor (2), a first (4) and a second fastening device (5). 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). Furthermore the sensor device (1) comprises at least one fixing component (8). The at least one fixing component (8) is arranged between one of the fastening devices (4, 5) and the container (6).

Abstract: An induction heating device (1) comprising an electromagnetic coil (2) connectable to a power supply (3). The electromagnetic coil (2) comprises a coil protection insert (4). The coil protection insert (4) protrudes from a first side (5) of the coil (2) towards a surface (6) of a work piece (7) to be heated by the induction heating device (1) when the induction heating device (1) is used for heating the work piece (7). The coil protection insert (4) preventing contact between the coil (2) and the surface (6) of the work piece (7).