| 摘要 |
The device has a light source for emitting a radiation beam that is divided into two partial radiation beams by a dividing grid (41). The partial beams are reintegrated into a resulting radiation beam. A detection unit (40) produces displacement-dependent scanning signals from the resulting beam. A reflector is arranged in optical paths of the partial beams, where polarization effects of the reflector are changed periodically with polarization periods along movement degree of freedom of a measuring rod (20). The polarization periods are larger than dividing periods of the grid. |
