| 主权项 |
1. A method for determining the alignment of a laser light beam referred to an axis of rotation of a device that is rotatable around the axis of rotation, wherein the alignment is ascertained by means of a laser light detection device,
wherein the laser light detection device comprises a first laser light sensor with a first planar measuring field, a second laser light sensor with a second planar measuring field, and a beam splitter, wherein the first measuring field has a coordinate system with an X1 coordinate axis and a Y1 coordinate axis perpendicular to the X1 coordinate axis, wherein the first laser light sensor is disposed to detect on the first measuring field the X1 coordinate and Y1 coordinate of a laser light spot of a laser light beam impinging on the first measuring field, wherein the second measuring field has a coordinate system with an X2 coordinate axis and a Y2 coordinate axis perpendicular to the X2 coordinate axis, wherein the second laser light sensor is disposed to detect on the second measuring field the X2 coordinate and Y2 coordinate of a laser light spot of a laser light beam impinging on the second measuring field, Wherein at least one coordinate axis selected from the group of coordinate axes consisting of: the Y2 coordinate axis of the second measuring field and the X2 coordinate axis of the second measuring field, is aligned parallel to the respective Y1 or X1 coordinate axis of the first measuring field, wherein the beam splitter has a planar entry surface and an exit surface parallel to this, wherein the entry surface is aligned parallel to the Y1 coordinate axis or X1 coordinate axis, wherein the beam splitter splits a laser light beam impinging on the planar entry surface into a first partial beam, which passes through the beam splitter, and a second partial beam produced by reflection of a part of the laser light beam on the entry surface, wherein the optical path of the first partial beam and of the second partial beam emerging from the beam splitter are configured such that the first partial beam impinges on the first measuring field and the second partial beam impinges on the second measuring field and such that the optical path of the first partial beam up to the first measuring field is shorter than the optical path of the second partial beam up to the second measuring field, wherein the method comprises the following steps: (A) Rotationally fixed connecting of the laser light detection device to the device, wherein the laser light detection device is connected in a rotationally fixed manner to the device such that the first measuring field is arranged at a distance from the device along the axis of rotation or along a line parallel to this, such that the second measuring field is arranged at a distance from the device along the axis of rotation or along a line parallel to this, and such that the X1 coordinate axis and the Y1 coordinate axis of the first measuring field are aligned essentially perpendicular to the axis of rotation of the device, (B) Irradiating of the entry surface of the beam splitter with the laser light beam, wherein during the irradiating of the entry surface the device is rotated, starting from a predetermined initial rotational position, in a predetermined direction of rotation through a predetermined angular dimension, (C) Detecting the X1 coordinates and Y1 coordinates of the laser light spot of the first partial beam on the first measuring field and the X2 coordinates and Y2 coordinates of the laser light spot of the second partial beam on the second measuring field in at least five different rotational positions of the device, these positions being assured during the rotation according to step (B), and detecting the angle of rotation by which the device is turned in each of the different rotational positions compared to the initial rotational position, and (D) Determining the alignment of the laser light beam referred to the axis of rotation of the device on the basis of the angle of rotation detected for each rotational position and the Y1 coordinates and Y2 coordinates detected, or on the basis of the angle of rotation detected for each rotational position and the X1 coordinates and X2 coordinates detected. |
