Device for monitoring spatial areas
A monitoring device for spatial areas comprises a receiver, to which an anamorphotic optical system, is assigned. The monitoring device also has a transmitter which scans a field of view assigned to the receiver using radiation pulse beams. A distance image of an object in the field of view can be produced by way of a radiation transit time determination with short-term integration carried out in an evaluation unit.
1. A device for monitoring a space, comprising:
a transmitter emitting light with temporal intensity changes;
a receiver having one-dimensional resolution, said receiver being formed by a row of sensor elements with a multiplicity of sensor elements disposed next to one another;
an optical system, for assigning to said receiver a field of view, disposed in a radiation path in front of said receiver;
said receiver receiving radiation pulses emitted by said transmitter into the field of view;
an evaluation unit connected to said receiver and to said transmitter, said evaluation unit serving to determine a transit time of the radiation pulses;
said transmitter subjecting the field of view to radiation pulse beams and mounting a light curtain in a direction of the space to be monitored, and thus to delimit a defined spatial area;
said evaluation unit determining the transit time of the radiation pulse beams upon an entry of an object through the light curtain and into the defined spatial area, and thereby being provided information about a position of the object in the light curtain; and
an anamorphotic optical system disposed to compress the field of view onto said receiver.
2. The device according to claim 1 , wherein said receiver has a plurality of sensor elements and the field of view is divided into field of view segments each assigned a respective said sensor element of said receiver.
3. The device according to claim 1 , wherein said transmitter is configured to sequentially illuminate the field of view with radiation beams.
4. The device according to claim 3 , which comprises a mirror device for emitting the radiation pulse beams in different directions.
5. The device according to claim 1 , wherein said transmitter is configured to simultaneously illuminate the field of view with different radiation pulse beams emitted in different directions.
6. The device according to claim 1 , wherein said receiver comprises a line of sensors with a row of sensor elements disposed next to one another for light transit time measurement.
7. The device according to claim 6 , wherein the field of view is divided into field of view strips.
8. The device according to claim 1 , wherein the radiation pulse beam is a ring-segment-shaped beam.
9. The device according to claim 1 , wherein an intensity of the radiation pulse beams varies from one to another.
10. The device according to claim 1 , wherein light curtains, formed one behind another, are designed as object illumination.
11. The device according to claim 1 , configured for a motor vehicle collision protection system.
12. The device according to claim 1 , configured for early detection of accidents involving motor vehicles.
13. The device according to claim 1 , configured for controlling automatic doors.
14. The device according to claim 1 , configured for automatic access control.
15. In combination with a motor vehicle, the device according to claim 1 .