Patent ID: 9146101
Filing Date: 2015-09-29
Classification: G01B

Abstract:
1. A device for determining the position of a first shaft and of a second shaft that is joined to the first shaft by means of a coupling, comprising: a first measurement unit being placed on a circumferential surface of the first shaft, a second measurement unit being placed on a circumferential surface of the second shaft, as well as an analysis unit; wherein at least one of the two measurement units has means for producing at least one light beam bundle and at least one of the two measurement units has detection means for detecting data relating to the impingement position of the light beam bundle on at least one detection area; wherein at least one of the two measurement units comprises at least one biaxial accelerometer sensor or gyroscope sensor for detecting the angle of rotation of the shafts; wherein the analysis unit determines respective angle-of-rotation position, angular velocity, and angular acceleration of the shafts in a plurality of measured positions from the sensor data and determines the respective impingement position of the light beam bundle on the at least one detection area from the data supplied by the detection means, and determines the offset of the shafts from at least a part of the determined impingement positions by curve fitting; and wherein the analysis unit is configured to perform a quality rating of the associated data for each of the individual measured positions based on at least the following criteria: and to exclude data of a measured position from being taken into consideration in determining the shaft offset or to take data into consideration only with reduced weighting if the quality rating of these data lies below a threshold value.