LASER TRACKER WITH POSITION-SENSITIVE DETECTORS FOR SEARCHING FOR A TARGET
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Abstract
Some embodiments of the invention relate to a laser tracker for continuously pursuing a reflective target and for determining the position of the target. The method may include a base which defines a vertical axis, a beam guiding unit for emitting a measurement beam, the beam guiding unit being pivotable by motor relative to the base about the vertical axis and an inclination axis, and a measurement axis being defined by an emission direction of the measurement beam. The laser tracker may include a precision distance measurement unit and an angle measurement function. The target search unit may have illumination source for illuminating the target, a first camera with a first position-sensitive detector and at least one part of the illumination beam reflected on the target being determinable as a first target position, and a control and evaluation unit.
33 Citations
44 Claims
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1-22. -22. (canceled)
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23. A laser tracker for the progressive tracking of a reflective target and for determining the position of the target having
a base which defines a standing axis, a beam guiding unit for emitting measuring radiation and for receiving at least a part of the measuring radiation reflected on the target, wherein the beam guiding unit is pivotable by a motor about the standing axis and an inclination axis in relation to the base and a measuring axis is defined by an emission direction of the measuring radiation a fine distance measuring unit for precisely determining the distance to the target using the measuring radiation, an angle measuring functionality for determining an alignment of the beam guiding unit in relation to the base, and a target search unit having an illumination source for illuminating the target using electromagnetic illumination radiation, a first camera, which defines a first field of vision, having a first position-sensitive detector, wherein a first image can be acquired using the first camera and at least a part of the illumination radiation reflected on the target can be determined in the first image as a first target position and the first camera is arranged having its optical axis offset to the measuring axis, and a control and analysis unit configured such that upon execution of a search functionality, finding of the target is performed as a function of the first target position, wherein the target search unit has a second camera, which defines a second field of vision, having a second position-sensitive detector, wherein a second image can be acquired using the second camera and at least a part of the illumination radiation reflected on the target can be determined in the second image as a second target position and the second camera is arranged having fixed camera positioning, which is known in relation to the first camera, such that the fields of vision of the first and second cameras at least partially overlap and the second camera is arranged having its optical axis offset to the measuring axis, and upon execution of the search functionality, the finding of the target is performed as a function of an integrated consideration of the first and second target positions.
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37. A laser tracker comprising:
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a base which defines a standing axis, and a beam guiding unit for emitting measuring radiation and for receiving at least a part of the measuring radiation reflected on the target, wherein the beam guiding unit is pivotable by a motor about the standing axis and an inclination axis in relation to the base, and a measuring axis is defined by an emission direction of the measuring radiation, wherein; an illumination of the target is performed using electromagnetic illumination radiation, a position-sensitive acquisition of a first image is performed using a first camera, which is arranged on the laser tracker and defines a first field of vision, wherein the first camera is arranged having its optical axis offset to the measuring axis, a first determination of at least a part of the illumination radiation reflected on the target is performed as a first target position in the first image, a position-sensitive acquisition of a second image is performed using a second camera, which is arranged on the laser tracker and defines a second field of vision, a second determination is performed of at least a part of the illumination radiation reflected on the target as a second target position in the second image, the second camera is arranged having fixed camera positioning, which is known in relation to the first camera such that the fields of vision of the first and second cameras at least partially overlap and the second camera is arranged having its optical axis offset to the measuring axis, and finding of the target is performed as a function of an integrated consideration of the first and second target positions. - View Dependent Claims (38, 39, 40, 41, 43)
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42. The laser tracker as claimed in claim, wherein known positioning and alignment of the first and second cameras in relation to one another and in relation to the measuring axis are determined, wherein
the target is provided in various positions and is targeted and surveyed using the measuring radiation, the first and second target positions are determined for each position of the target, and the relative positioning and alignment are derived from the surveying of the target and the target positions determined thereto.
Specification