Patent ID: 8724120
Filing Date: 2014-05-13
Classification: G01B,G01C,G01S

Abstract:
1. A method for measuring with a system, the method comprising steps of: providing the system including a collection of retroreflector targets and a laser tracker, the collection of retroreflector targets including at least three retroreflector targets configured to be arranged in a non-collinear relationship when placed on an object, the at least three non-collinear retroreflector targets including a first target, a second target, and a third target, the laser tracker in a first frame of reference fixed with respect to the laser tracker surroundings, the laser tracker having a structure, a first light source, an absolute distance meter, a first angular transducer, a second angular transducer, a tracking system, a first camera, a second light source, a processor, and a memory, the memory operably coupled to the processor, the structure rotatable about a first axis and a second axis, the first light source producing a first light beam that cooperates with the absolute distance meter, the first angular transducer measuring a first angle of rotation about the first axis, the second angular transducer measuring a second angle of rotation about the second axis, the tracking system configured to move the first light beam to a center of any retroreflector target from among the collection of retroreflector targets, the first camera including a first lens system and a first photosensitive array, the second light source providing a second light beam, and the processor configured to operate the laser tracker; storing, with the processor into the memory, a list of nominal coordinates for the first target, the second target, the third target, and at least one additional point, the nominal coordinates being three-dimensional coordinates in a second frame of reference; capturing on the first photosensitive array a portion of the light emitted by the second light beam and reflected off the first target, the second target, and the third target; obtaining spot positions on the first photosensitive array from the portion of light reflected off each of the first target, second target, and the third target; determining a correspondence between a first spot position, a second spot position, and a third spot position on the first photosensitive array and the nominal coordinates of the first target, the second target, and the third target, respectively; directing the first light beam to the first target based at least in part on the nominal coordinates of the first target and the first spot position; measuring three-dimensional coordinates of the first target using the absolute distance meter, the first angular transducer, and the second angular transducer; directing the first light beam to the second target based at least in part on the nominal coordinates of the second target and the second spot position; measuring three-dimensional coordinates of the second target using the absolute distance meter, the first angular transducer, and the second angular transducer; directing the first light beam to the third target based at least in part on the nominal coordinates of the third target and the third spot position; measuring three-dimensional coordinates of the third target using the absolute distance meter, the first angular transducer, and the second angular transducer; directing the first light beam to a plurality of additional points, the plurality of additional points including the at least one additional point, the plurality of additional points indicative of actions to be taken by an operator; determining three-dimensional coordinates of the at least one additional point in the first frame of reference based at least in part on the measured three-dimensional coordinates of the first target, the second target, the third target, and the nominal coordinates of the at least one additional point; and storing, with the processor into the memory, the determined three-dimensional coordinates of the at least one additional point.