Opto-electronic detection device and method for sensing the surroundings of a motor vehicle by scanning
The invention relates to a scanning opto-electronic detection device and a method for sensing the surroundings of a motor vehicle 1 by scanning by means of an opto-electronic detection device 2 . The detection device 2 comprises a transmission and reception optical system 4 that outputs electromagnetic rays and maps reflected rays on a detector, wherein the detector is of multiline design and comprises a plurality of detector cells for providing electrical received signals on the basis of received reflected rays, which detector cells are lined up in a detector cell stack and are evaluable in parallel measurement planes. The detection device furthermore comprises a mirror carrier 7 having mirror faces 9, 10 that are averted from one another and that are arranged in a manner tilted at a tilt angle with respect to an axis of rotation 8 of the mirror carrier 7 and map different vertical sensing regions for reflected rays onto the detector. In order to allow the surroundings of a motor vehicle to be sensed with little physical outlay by means of an opto-electronic detection device having as large a sensing region as possible, the invention provides for determined tilt angles α of the mirror faces 9, 10 that are such that the sensing regions 14′, 14″ intersect in a central section of a total sensing region 16.
1. A scanning opto-electronic detection device comprising a laser scanner for a motor vehicle, the detection device comprising:
a transmission and reception optical system that outputs electromagnetic rays and maps rays that are reflected from a target object in surroundings of the motor vehicle onto a detector; and
a mirror carrier configured to be driven in rotation and that, for the purpose of deflecting the transmitted rays and the reflected rays, is associated with the transmission and reception optical system and has mirror faces that are remote from one another,
wherein the detector is of multiline design and comprises a plurality of detector cells for providing electrical received signals on the basis of received reflected rays, said detector cells being lined up in a detector cell stack and being evaluable in parallel measurement planes, wherein the mirror faces are arranged in a manner tilted only by a tilt angle with respect to an axis of rotation of the mirror carrier and map different vertical sensing regions for reflected rays onto the detector, wherein
tilt angles for the mirror faces are such that the sensing regions partially overlap in at least one section of a total sensing region.
2. The detection device according to claim 1 , wherein each of the mirror faces is arranged at particular tilt angles with respect to the axis of rotation of the mirror carrier.
3. The detection device according to claim 2 , wherein the mirror faces are situated parallel and the mirror carrier is arranged at a tilt angle with respect to its axis of rotation.
4. The detection device according to claim 1 , wherein the tilt angles of the mirror faces are such that the sensing regions are mapped onto at least one common detector cell.
5. The detection device according to claim 1 , wherein the detector cells are arranged at intervals from one another to form intermediate spaces, wherein the mirror faces are arranged at a tilt angle that is such that each mirror face maps the detector cells in the intermediate spaces of the mapping of the respective other mirror face.
6. A method for sensing the surroundings of a motor vehicle by scanning by means of an opto-electronic detection device comprising a laser scanner, the method comprising:
outputting, by a transmission and reception optical system, electromagnetic rays; and
mapping, by the transmission and reception optical system, rays reflected from a target object in surroundings of the motor vehicle onto a multiline detector having a plurality of detector cells lined up in a detector cell stack,
wherein a rotating mirror carrier having mirror faces that are averted from one another and tilted at particular tilt angles in relation to an axis of rotation of the mirror carrier deflects transmitted rays onto the scene to be surveyed and/or reflected rays to the transmission and reception optical system and determines different vertical sensing regions of the detector in accordance with the tilt angles,
wherein the detector cells take the received rays as a basis for producing electrical received signals that are assigned to parallel measurement planes within the sensing regions of the detector, and
wherein from the measurement planes of both sensing regions a total sensing region is ascertained for two successive scanning processes with the respective mirror faces, wherein
the mirror faces are set, and deflect rays, at tilt angles with respect to the axis of rotation are such that the sensing regions partially overlap.
7. The method according to claim 6 , wherein the received signals of the detector cells are assigned to respective sensing regions of the mirror faces.
8. The method according to claim 6 , wherein the received signals of the detector cells are each assigned, during the scanning processes of both mirror faces, to parallel measurement planes at a height that is dependent on the tilt angle, and the parallel measurement planes of two successive scanning processes are projected onto the total sensing region in coplanar fashion.