| 摘要 |
The device (30) has a housing in which a sender and a receiver are arranged, where the receiver comprises a pre-determined reception range corresponding to a radiation range of the sender. The radiation range or reception range has a pre-determined spatial relationship with respect to two light reflecting sections. The spatial relationship of the radiation or reception range prevents that the receiver receives an echo from an object, based on reflection of a laser pulse by one of the light reflecting sections, when the laser pulse sent by the sender is reflected by one of the sections. |
