| 摘要 |
The device (34) has a transmitting device (18) for light and a receiving device (20), which are attached to an arm (36). A reflector device (22) for the light is attached to another arm (38). Distance of the latter arm to the former arm and/or an angular position of the latter arm to the former arm is adjusted by an adjusting device (60) in a determined manner. The latter arm is connected with the former arm by a bridge device (40) and is aligned parallel to the former arm. A polarization filter is upstream to the receiver device. |
