| 主权项 |
1. A method for determining the alignment of a laser light beam (10) referred to an axis of rotation (12) of a device (14) that is rotatable around the axis of rotation (12), wherein the alignment is ascertained by means of a laser light detection device (16),
wherein the laser light detection device (16) comprises a first laser light sensor (18) with a first planar measuring field (20), a second laser light sensor (22) with a second planar measuring field (24), and a beam splitter (26),
wherein the first measuring field (20) has a coordinate system (28) with an X1 coordinate axis (30) and a Y1 coordinate axis (32) perpendicular to the X1 coordinate axis (30), wherein the first laser light sensor (18) is disposed to detect on the first measuring field (20) the X1 coordinate and Y1 coordinate of a laser light spot (34) of a laser light beam (44) impinging on the first measuring field (20),wherein the second measuring field (24) has a coordinate system with an X2 coordinate axis (36) and a Y2 coordinate axis (38) perpendicular to the X2 coordinate axis (36), wherein the second laser light sensor (22) is disposed to detect on the second measuring field (24) the X2 coordinate and Y2 coordinate of a laser light spot (34) of a laser light beam (46) impinging on the second measuring field (24),wherein the Y2 coordinate axis (38) of the second measuring field (24) is aligned parallel to the Y1 coordinate axis (32) of the first measuring field (20) and/orwherein the X2 coordinate axis (36) of the second measuring field (24) is aligned parallel to the X1 coordinate axis (30) of the first measuring field (20), wherein the beam splitter (26) has a planar entry surface (40) and an exit surface (42) parallel to this, wherein the entry surface (40) is aligned parallel to the Y1 coordinate axis (32) or X1 coordinate axis (30),wherein the beam splitter (26) splits a laser light beam (10) impinging on the planar entry surface (40) into a first partial beam (44), which passes through the beam splitter (26), and a second partial beam (46) produced by reflection of a part of the laser light beam (10) on the entry surface (40),wherein the optical path (48) of the first partial beam (44) and of the second partial beam (46) emerging from the beam splitter are configured such that the first partial beam (44) impinges on the first measuring field (20) and the second partial beam (46) impinges on the second measuring field (24) and such that the optical path (48) of the first partial beam (44) up to the first measuring field (20) is shorter than the optical path (48) of the second partial beam (46) up to the second measuring field (24),wherein the method comprises the following steps:(A) Rotationally fixed connecting of the laser light detection device (16) to the device (14), wherein the laser light detection device (16) is connected in a rotationally fixed manner to the device (14) such that the first measuring field (20) is arranged at a distance from the device (14) along the axis of rotation (12) or along a line parallel to this, such that the second measuring field (24) is arranged at a distance from the device (14) along the axis of rotation (12) or along a line parallel to this, and such that the X1 coordinate axis (30) and the Y1 coordinate axis (32) of the first measuring field (20) are aligned essentially perpendicular to the axis of rotation (12) of the device (14),(B) Irradiating of the entry surface (40) of the beam splitter (26) with the laser light beam (10), wherein during the irradiating of the entry surface (40) the device (14) is rotated, starting from a predetermined initial rotational position (50), in a predetermined direction of rotation (51) through a predetermined angular dimension.(C) Detecting the X1 coordinates and Y1 coordinates of the laser light spot (34) of the first partial beam (44) on the first measuring field (20) and the X2 coordinates and Y2 coordinates of the laser light spot (34) of the second partial beam (46) on the second measuring field (24) in at least five different rotational positions of the device (14), these positions being assured during the rotation according to step (B), and detecting the angle of rotation by which the device (14) is turned in each of the different rotational positions compared to the initial rotational position (50), and(D) Determining the alignment of the laser light beam (10) referred to the axis of rotation (12) of the device (14) 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. |
