System and method using a multi-plane curtain

1. A scanning system, comprising:

a range scanner mounted to a structure and set at a height above a ground surface, the range scanner disposed at an angle between 0 degrees and 90 degrees with respect to a vertical axis, and configured to output a laser scanning beam in a plurality of directions; and

a mirror block mounted to the structure and having a plurality of reflective surfaces externally disposed around the laser range scanner to receive the laser scanning beam and to reflect the laser scanning beam toward the ground surface in a plurality of directions to create multiple downwardly projecting scanning planes,

wherein, in response to an object in the multiple downwardly projecting scanning planes, the laser range scanner is further configured to receive a signal from the multiple scanning planes and communicate the received signal to a controller as a detection signal.

2. The system of claim 1 , further comprising:

a bottom laser scanner configured to direct a horizontal scanning plane in a forward direction.

3. The system of claim 2 , wherein at least one of the downwardly projecting scanning planes intersects the horizontal scanning plane.

4. The system of claim 3 , wherein the multiple scanning planes intersect the horizontal scanning plane to define a safety zone in the horizontal scanning plane between the multiple downwardly projecting scanning planes.

5. The system of claim 3 , wherein the multiple scanning planes intersect the horizontal scanning plane to define a warning zone in the horizontal scanning plane external to the multiple downwardly projecting scanning planes.

6. The system of claim 1 , wherein the structure is a mast coupled to a vehicle.

7. The system of claim 6 , wherein, in response to receipt of the detection signal, the controller is configured to cause a drive mechanism of the vehicle to alter a movement of the vehicle.

8. The system of claim 7 , wherein the drive mechanism is configured to alter movement of the vehicle in response to the controller by at least one of slowing and halting the movement of the vehicle.

9. The system of claim 1 , wherein the mirror block comprises:

a bracket secured to the structure and having one or more mirrors coupled thereto,

wherein one or more mirrors are secured to the bracket in a fixed orientation with respect to the laser range scanner.

10. The system of claim 1 , wherein the mirror block includes a plurality of flat surfaces, each flat surface arranged to reflect the scanning signal to form a different one of the downwardly projecting scanning planes.

11. The system of claim 1 , wherein the mirror block includes a contoured reflective surface configured to form the multiple downwardly projecting scanning planes.

12. The system of claim 1 , wherein at least one of the multiple downwardly projecting scanning planes is a forward downwardly projecting scanning plane.

13. The system of claim 12 , wherein the multiple downwardly projecting scanning planes includes a left side downwardly projecting scanning plane and a right side downwardly projecting scanning plane.

14. A scanning and detection method, comprising:

providing a range scanner mounted to a structure and set at a height above a ground surface, including disposing the range scanner at an angle between 0 degrees and 90 degrees with respect to a vertical axis;

outputting a laser scanning beam in a plurality of directions by the laser range scanner;

providing a mirror block mounted to the structure and having a plurality of reflective surfaces externally disposed around the laser range scanner;

receiving the laser scanning beam by the mirror block and reflecting the laser scanning beam toward the ground surface in a plurality of directions to create multiple downwardly projecting scanning planes;

receiving, by the laser range scanner, a signal from the multiple downwardly projecting scanning planes in response to an object in the multiple downwardly projecting scanning planes; and

outputting, by the laser range scanner, a detection signal based on the received signal.

15. The method of claim 14 , further comprising:

providing a bottom laser scanner between the ground surface and the laser range scanner and directing a horizontal scanning plane from the bottom laser scanner in a forward direction,

including the multiple downwardly projecting scanning planes intersecting the horizontal scanning plane.

16. The method of claim 15 , further comprising:

projecting at least one of the multiple downwardly projecting scanning planes as a forward downwardly projecting scanning plane;

projecting at least one of the multiple downwardly projecting scanning planes as a left side downwardly projecting scanning plane; and

projecting at least one of the multiple downwardly projecting scanning planes as a right side downwardly projecting scanning plane.

17. The method of claim 14 , further comprising:

intersecting the multiple downwardly projecting scanning planes with the horizontal scanning plane to define a safety zone in the horizontal scanning plane between the multiple downwardly projecting scanning planes.

18. The method of claim 14 , further comprising:

intersecting the multiple downwardly projecting scanning planes with the horizontal scanning plane to define a warning zone in the horizontal scanning plane external to the multiple downwardly projecting scanning planes.

19. The method of claim 14 , wherein the structure is a mast coupled to a vehicle, and the method further comprises:

receiving the detection signal by a controller coupled to a drive mechanism of the vehicle; and

altering a movement of the vehicle by the drive mechanism in response to the detection signal.

20. The method of claim 19 , wherein altering the movement of the vehicle comprises at least one of slowing and halting the movement of the vehicle.