Detection device, detection system and production line

The invention discloses a detection device, a detection system and a production line. The detection device comprises a base which is provided with an avoiding groove and a first via hole communicated with the avoiding groove; the detection assembly is mounted on the base; the detection assembly comprises a mounting seat and a roller rotationally connected with the mounting seat; the mounting seat is provided with a second via hole, and the first via hole and the second via hole are arranged to allow an optical fiber to pass through; wherein at least part of the mounting seat is located in the avoiding groove, the roller wheel is provided with a detection surface, the detection surface is used for being in contact with a to-be-detected component, and the roller wheel can move relative to the avoiding groove in the radial direction so as to convert the radial movement of the roller wheel into deformation of the optical fiber. The detection device can convert the movement of the roller along the radial direction