US 12,455,359 B2
Method for calibrating a laser scanner, and technical apparatus
Maja Sliskovic, Ettlingen (DE); and Valentin Harr, Altensteig (DE)
Assigned to SEW-EURODRIVE GMBH & CO. KG, Bruchsal (DE)
Appl. No. 18/272,398
Filed by SEW-EURODRIVE GMBH & CO. KG, Bruchsal (DE)
PCT Filed Dec. 2, 2021, PCT No. PCT/EP2021/084026
§ 371(c)(1), (2) Date Jul. 14, 2023,
PCT Pub. No. WO2022/152463, PCT Pub. Date Jul. 21, 2022.
Claims priority of application No. 102021000126.5 (DE), filed on Jan. 14, 2021.
Prior Publication US 2024/0085542 A1, Mar. 14, 2024
Int. Cl. G01S 7/497 (2006.01); G01S 17/931 (2020.01); G01B 11/26 (2006.01); G01S 7/40 (2006.01); G01S 17/86 (2020.01)
CPC G01S 7/4972 (2013.01) [G01S 17/931 (2020.01); G01B 11/26 (2013.01); G01S 7/4086 (2021.05); G01S 7/497 (2013.01); G01S 17/86 (2020.01)] 22 Claims
OG exemplary drawing
 
1. A method for calibrating a laser scanner of a vehicle by at least one reflection unit adapted to reflect a laser beam of the laser scanner, the reflection unit including a first plate, a second plate, and a screen, the first plate arranged between the second plate and the screen in a beam direction, the first plate having a first reflection surface extending at least approximately perpendicular to the beam direction, the second plate having a second reflection surface extending at least approximately perpendicular to the beam direction, the screen having a third reflection surface extending at least approximately perpendicular to the beam direction, the first plate arranged offset from the second plate in a vertical direction to form a gap that extends in the vertical direction and in a transverse direction between the first plate and the second plate, the screen being adapted and arranged so that a projection of the gap in the beam direction is incident on the third reflection surface of the screen, comprising:
checking an alignment of the laser scanner, the checking including:
directing a laser beam of the laser scanner at the reflection unit at least approximately in the beam direction;
moving the laser beam being in the transverse direction along the reflection unit;
measuring, for a plurality of positions of the laser beam in the transverse direction, a distance of the laser scanner from a respective one of the reflection surfaces from which the laser beam is reflected; and
determining an alignment of the laser scanner from the measured distances of the laser scanner from the respective one of the reflection surfaces; and
correcting the alignment of the laser scanner and/or providing an instruction for correction of the laser scanner in response to the determination of an incorrect alignment of the laser scanner;
wherein an extension of the third reflection surface of the screen in the vertical direction is greater than an extension of the gap in the vertical direction, and an extension of the third reflection surface of the screen in the transverse direction is greater than an extension of the gap in the transverse direction.