Device, method, computer program product, and carrier for indicating at least one of an orbit of, and a deviation from a nominally round surface

A device for indicating at least one of an orbit of, and a deviation from a nominally round surface of a mechanical object, the device comprising:

• a processor;
• and
• output means for outputting a deviation profile,
• wherein the processor for generating the deviation profile based on distance data sets covering the nominally round surface;
• each distance data set comprising at least three distances, measured in a direction of rotation, to the nominally round surface and related to an angle, the at least three distances having been measured at distance measuring angles;
• and the processor for indicating the deviation profile using the output means, wherein the step of generating the deviation profile, R, is based on the following expression:
• AR=G, where
• A is a matrix based on the distance measuring angles,
• R is a vector comprising the deviation profile, and
• G is a matrix comprising the distances data sets.

A device for indicating at least one of an orbit of, and a deviation from a nominally round surface of a mechanical object, the device comprising:

• a processor;
• and
• output means for outputting a deviation profile,
• wherein the processor for generating the deviation profile based on distance data sets covering the nominally round surface;
• each distance data set comprising at least three distances, measured in a direction of rotation, to the nominally round surface and related to an angle, the at least three distances having been measured at distance measuring angles;
• and the processor for indicating the deviation profile using the output means, wherein the step of generating the deviation profile, R, is based on the following expression, in the case the distance data sets comprise three distances:
• kr=R, where
• where r is a vector comprising ri being the distance read by distance gauge i (i=1 . . .n) and k is a vector comprising weights k1 (i=1 . . .n).